WO2004066154A1 - コンテンツ配信システム、情報処理装置又は情報処理方法、並びにコンピュータ・プログラム - Google Patents
コンテンツ配信システム、情報処理装置又は情報処理方法、並びにコンピュータ・プログラム Download PDFInfo
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- WO2004066154A1 WO2004066154A1 PCT/JP2003/016623 JP0316623W WO2004066154A1 WO 2004066154 A1 WO2004066154 A1 WO 2004066154A1 JP 0316623 W JP0316623 W JP 0316623W WO 2004066154 A1 WO2004066154 A1 WO 2004066154A1
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- 238000004590 computer program Methods 0.000 title claims description 14
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Classifications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F21/10—Protecting distributed programs or content, e.g. vending or licensing of copyrighted material ; Digital rights management [DRM]
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F15/00—Digital computers in general; Data processing equipment in general
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
Definitions
- the present invention relates to digital data and video such as music data, image data, electronic publications, and the like distributed over a network or the like.
- Content distribution system that manages the use of content such as images, information processing devices or methods that use content, and computer programs, and in particular, the use of content based on some kind of contract such as a license or use conditions.
- the present invention relates to a content distribution system that manages content, an information processing apparatus or an information processing method that uses content, and a computer program.
- the present invention relates to a content distribution system that controls the use of content and protects the content by granting a license to the user of the content, an information processing apparatus or information processing method that uses the content, and a computer program.
- a content distribution system that enables a licensed user to use content across multiple devices while preventing unauthorized use of the content, and an information processing device that uses the content Or, it relates to an information processing method and a computer program.
- xDSL x Digital Subscriber Line
- CATV Consumer TV
- wireless networks etc.
- digital data such as music data, image data, electronic publications, etc.
- Moving image a mechanism is in place to enable delivery of rich content without stress to users.
- the distributed content is digital data, and operations such as copying and tampering can be performed relatively easily.
- fraudulent activities such as copying and falsification of these contents are frequently performed at present, and this is a major factor that hinders the profits of digital content vendors.
- a vicious cycle has arisen in which content prices must be increased, which is a barrier to diffusion.
- encryption technology it is possible to protect the content flowing on the communication channel from malicious third parties.
- not only the content robbery process but also unauthorized copying and unauthorized use after the content is provided to legitimate users have become a serious problem.
- DRM rights management method
- DRM systems typically consist of content providers, license managers, and users.
- the user has a content playback device and uses it to use the content.
- the license administrator issues a license to the user.
- the content provider provides the content to the user.
- Co nt is the content provider, that different for each content key (encrypted form E content key KJ (K c, is distributed Co nt). In this specification, this is referred to as “encrypted content”.
- the license issuer issues a license after processing the payment to the user.
- Issuance of the license referred to here is to give the content key K c to the playback device of the user. Therefore, with the license administrator reproducing apparatus, reproducing apparatus differs dark every ⁇ 3 ⁇ 4K U shares (shared dark K U is either performed when the license issuance, or advance those shared Play is incorporated in the apparatus), it sends the content key K c encrypted data E with the encryption key K u (K u, the playback apparatus as K c). This data is called "license 'token". Reproducing apparatus of the user who received the license, taken delivery and encryption key K u license 'token E (K u, K c) the encrypted content E (K c, Co nt) using, to play content Can be.
- the license using a cryptographic key K u - DOO one token E (K u, c) decrypts the content key K c from then the content key K c the use connexion ⁇ I spoon contents E (K c, Co nt ) To decrypt and play back the Content Cont. Therefore, only when the combination of the playback device and the license token and the encrypted content is correct, that is, only the user who has obtained the license can use the content.
- the playback device in order to protect the right to use the content, the playback device must prevent the decrypted content from leaking to the outside. To this end, playback device has to process so as not to leak the encryption key K u and content key K c Ya decoded content C ont the outside. This is because if the decrypted content leaks out once, it can be copied and used without restriction.
- the reproducing apparatus is a condition requires that the dark ⁇ K u and content key K c, as well as the decrypted content Co nt can handle without leaking to the outside.
- a playback device satisfying such a condition will be referred to as “valid”.
- a license (usage permission) for content is given to a user by giving a content key Kr to a (specific) playback device of the user.
- this licensing reproducing device for receiving the content key K c is the condition that is valid is essential. Therefore, the license issuer who issues the license must specify the playback device to which the license is issued, and give the content key only to the legitimate playback device. For this reason, the license issuer has a database on valid playback devices, and licenses must be issued based on it.
- license issuance in DRM is a process without scalability for an increase in the number of playback devices.
- user authentication is performed before providing the content. If the DRM method is used, in addition to user authentication, it is necessary to specify a playback device for the content owned by the user and generate a license for each playback device. This reduces the processing speed of content provision.
- a user generally owns and uses a plurality of content reproducing apparatuses, and a content license is realized by giving a specific reproducing apparatus. For this reason, even if each playback device owned by the user satisfies the condition of being “valid”, if the user wants to use the same content across a plurality of playback devices, a license is required for each playback device. It is necessary to take steps to obtain it, and the operation becomes troublesome. Alternatively, you will be billed sequentially to use the same content, so you will be forced to pay too much.
- a further object of the present invention is to provide an excellent content distribution system, an information processing device using content, or a content distribution system, which can control the use of content by licensing a user of the content and appropriately protect the content. To provide information processing methods and computer programs.
- a further object of the present invention is to provide an excellent content distribution system capable of enabling a user once licensed to use content across a plurality of devices while preventing unauthorized use of the content.
- Another object of the present invention is to provide an information processing device or information processing method using contents, and a computer program.
- the present invention has been made in view of the above problems, and a first aspect of the present invention is a content distribution system for distributing content to a user's client, wherein a user has two or more clients Each client can use the content legitimately based on the license,
- a license providing means for providing a license for the acquired content to the requesting client in response to the request;
- Content that indicates that the transfer of content from one client to another client of the same user is valid.
- Content that provides a copy certificate to the source client.
- a content distribution system comprising:
- system here refers to a logical grouping of multiple devices (or functional modules that realize specific functions), and each device or functional module is contained in a single housing. It doesn't matter if you have any strength!
- the user can use the same client.
- the client at the destination can confirm that the right to retrieve and play the received content is valid.
- the content distribution system according to the first aspect of the present invention, even when a plurality of clients possessed by a user are registered in different licenses and servers, illegal use of content is prevented.
- users once licensed, users can use the content across multiple devices.
- the burden on the user of using content between multiple clients is reduced, and the use of content distribution services is promoted.
- Each client that is the source and destination of the content may be registered with a separate content distributor.
- the content distributors can refer to each other's customer-related information by means of the customer-related information providing means, and the distributor that registers the content transfer source client can use the content transfer destination client.
- the matching process may be performed to confirm that the device is a legitimate device owned by the same user.
- the content-copy certificate providing means may generate a content copy certificate including a license for the client at the movement destination.
- the destination client can use the content by extracting the license from the content 'copy certificate. Therefore, the client at the destination does not need to register with the content distributor and obtain a license directly, and sharing of the content can be realized smoothly.
- each client of the content transfer source and the content transfer destination may be registered in different license providing means, and each license providing means may provide its own public key to the registered client.
- the content copy certificate providing means uses the secret key of the license providing means in which the content transfer destination client is registered to apply an electronic signature to the content / copy certificate, thereby obtaining the content.
- the copy certificate can be protected from tampering and can be moved safely.
- the client at the destination can decrypt using the public key and extract the license for the content.
- the content copy certificate providing means obtains a license ID of the content to be moved and a client ID of the destination client from the source client, and further inquires the customer related information related means.
- the source client is valid, the source client has a license for the content to be moved, and the user who owns the source client actually owns the destination client.
- the customer-related information providing means includes a correspondence table between the leaf ID and the client ID, a correspondence table between the client ID and the client's public key certificate, a correspondence table between the client ID and the user ID, and a correspondence table between the client ID and the user ID. It is sufficient to manage the correspondence table, the correspondence table between the user ID and the content ID of the downloaded content, the correspondence table between the user ID and the license ID of the downloaded license, and the issuance history of the content / copy certificate.
- the customer-related information managing means may be configured such that the content providing means provides the content to the client 1, and / or updates the customer-related information each time the license providing means provides a license to the client. do it.
- the content distribution system may further include charging processing means for performing charging processing to the client in accordance with provision of the license to the client.
- the accounting unit may provide a difference between a case where a license is provided and a case where a content copy certificate is provided. For example, the cost of a user's use of content between multiple clients by making the content certificate equivalent to a second licensing of the same content less expensive or free of charge than the initial license acquisition. Burden is reduced,
- a second aspect of the present invention is a computer program written in a computer-readable form so as to execute a process for providing a license for using content on a computer system, wherein the user has two or more programs. Each client has legitimate use of the content based on the license,
- the computer 'program according to the second aspect of the present invention defines a computer' program described in a computer-readable format so as to realize predetermined processing on the computer 'system.
- a cooperative action is exerted on the computer system, and the first aspect of the present invention is realized.
- FIG. 2 is a diagram schematically illustrating a hardware configuration of a host device that operates as various servers or clients.
- FIG. 3 is a diagram schematically illustrating a functional configuration when the host operates as a client.
- FIG. 4 is a diagram schematically showing a functional configuration when the host operates as a license server.
- FIG. 5 is a diagram schematically showing a functional configuration when the host operates as a content server.
- FIG. 6 is a flowchart showing a processing procedure for the client to pre-register with the license server.
- FIG. 7 is a flowchart showing a processing procedure on the client side when downloading content.
- Figure 8 shows the content 'server-side processing procedure when downloading content.
- 5 is a flowchart illustrating the operation of the embodiment.
- FIG. 9 is a diagram showing a configuration example of a data format used when distributing content from the content server A to the client A.
- FIG. 10 is a flowchart showing a processing procedure for reproducing the content downloaded on the client A side.
- FIG. 11 is a flowchart showing a processing procedure for acquiring a license necessary for reproducing the content downloaded on the client A side.
- FIG. 12 is a diagram schematically showing a data structure of a license provided from a license server to a client.
- FIG. 13 is a flowchart showing a processing procedure for the license 'server A to provide a license to the client A.
- Figure 14 is a flowchart showing the detailed procedure of the license update process for the license server executed by the client.
- FIG. 15 is a flowchart showing a detailed processing procedure for updating a license by the license server.
- FIG. 16 is a flowchart showing a processing procedure for the client A to acquire the contents and the copy certificate from the license server A.
- FIG. 17 is a flowchart showing a processing procedure for the license server A to issue a content copy certificate in response to a request from the client A.
- FIG. 18 is a diagram schematically showing the data structure of the content copy certificate.
- FIG. 19 is a flowchart showing a processing procedure performed on the client A, which is a transfer source, when content is transferred between clients.
- FIG. 20 is a flowchart showing a processing procedure for importing the content on the client B side where the content is copied.
- FIG. 21 is a diagram for explaining the process of the client using the content supplied from the content server based on the license supplied from the license server.
- FIG. 22 is a diagram showing the structure of the EKB. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 1 schematically shows a configuration example of a content distribution system according to an embodiment of the present invention.
- the content distribution system is divided into a distributor that provides the content and a customer.
- the distributors and customers are interconnected by, for example, the Internet or other broadband communication networks (xDS L: XDigita 1 Subscriber Line, CATV (Cable TV), wireless networks, etc.).
- xDS L XDigita 1 Subscriber Line, CATV (Cable TV), wireless networks, etc.
- the content distributor is composed of multiple distributors, including distributors A and B.
- Each distribution company has a license server that registers users (clients) and licenses content for each content playback device (hereinafter, referred to as a “client”) of a customer, and stores and distributes content to be provided.
- Content server that performs distribution processing
- a charging server that performs charging processing at the time of user registration and / or license provision (and at the time of issuing a content copy certificate (described later)), and licensing of content to customers or clients It has a business database server that stores various data required to provide
- each distribution company is interconnected by, for example, the Internet or another backbone communication network.
- DB C business database server C that manages business databases for each distributor has been constructed.
- the business-related database 'Server A (DB A)' and the business-related database server B (DB B) installed for each distribution company refer to the business-related DB C for user information that does not exist on their own. Synchronous processing to reflect the updated contents to the business DB C is performed appropriately.
- the business DB C is not essential, and it is sufficient if there is some mechanism that can share information between the business DB A and the business DB B.
- distributors A and B each have their own license-server, billing server, content 'server, business database' server. May be shared between distribution companies, or the content server owned by one distribution company may be diverted to the other rooster company.
- Each client has the “legal” condition referred to in DRM, and can process encryption keys, content keys, and decrypted content without leaking them to the outside.
- client A has registered in advance with distributor A, and can provide content and acquire a license from distributor A.
- client B has registered in advance with distributor B, and can provide content and acquire licenses from distributor B.
- Client A makes a pre-registration and license acquisition request to license server A
- client B makes a pre-registration and license acquisition request to license server B.
- licenses “server A” and “server B” have their own private keys.
- the transfer of content from Client A to Client B may be performed, for example, by moving the recording medium on which content writing processing has been performed on Client A to Client B, or by transmitting data using a personal network. It is. However, when transferring content from Client A to Client B, it is assumed that Client A, the source of the transfer, has already purchased (or obtained a license for) the content from the distributor.
- a user ID is used to specify a user (described later), but a client ID that specifies each client can be used instead. Even for the same user, there are individual user IDs for each service provided by the distributor, but these user IDs are associated using each business database. It is assumed that each distribution company can recognize that the user is the same user. Client IDs are also managed by the business databases' servers A, B, and C. In this embodiment, authentication and authentication are performed using a user ID and a password. However, authentication (equipment and authentication) using a client ID (equipment ID) and user information using a combination of device authentication and user authentication are performed. May be handled.
- the content distribution system has the following items as preconditions.
- An environment is provided (where copyright is managed) in which distributed content can be restricted in terms of the extent to which customers can use the content, depending on the intention of the distributor or the holder of the copyright of the content.
- Each client has an information processing method to ensure copyright management and protection (it is “valid”).
- Each client can store the received content on the receiving client or on a recording medium that can be connected to the receiving client.
- FIG. 2 schematically illustrates a hardware configuration of a host device that operates as various servers or clients in the content distribution system according to the present embodiment.
- the main controller, CPU (CentralPRocsEngSUnit) 101 executes various applications under the control of the operating system (OS).
- OS operating system
- the CPU 101 executes a client application that performs business services such as pre-registration with a distributor, downloading of content, obtaining a license, and storing content.
- the host operates as a server such as a license server, a content server, a billing server, or a business database server
- the CPU 101 executes various server applications.
- the CPU 101 is interconnected with other devices (described later) via a bus 108.
- the main memory 102 is a program executed by the CPU 101, and is a storage device used for loading code and temporarily storing work data of the execution program, such as a DRAM (Dynamic RAM). Semiconductor memory is used.
- the CPU 101 executes a client application that performs business services such as pre-registration with a distributor, downloading of content, obtaining a license, and storing content. Will be loaded.
- the host operates as a server such as a license server, a content server, a billing server, and a business database server
- the CPU 101 loads various types of servers and applications into the seed memory 102 as execution programs. Is done.
- ROM (Read Only Memory) 103 stores data permanently. This is a semiconductor memory that is stored in a memory. For example, a self-diagnosis test (POST: Power ON Self Test) at startup or a program for hardware input / output (BIOS: Basic Input / O utput Sy st em) is written.
- POST Power ON Self Test
- BIOS Basic Input / O utput Sy st em
- the display controller 104 is a dedicated controller for actually processing a drawing command issued by the CPU 101.
- the drawing data processed by the display 'controller 103 is written to, for example, a frame' buffer (not shown) and then output to the screen by the display 111.
- the display screen of the display 11 visually feeds back to the user the contents of the input from the user and the processing result (more specifically, the content reproduction screen), or an error or other system message. Have a role.
- the input device interface 105 is a device for connecting a keyboard 112, a mouse 113, or other user input devices to the interactive device 100.
- the network interface 106 connects the system 100 to a local network such as a LAN (Local Area Network) or a wide area network such as the Internet according to a predetermined communication protocol such as Ethernet. be able to.
- a local network such as a LAN (Local Area Network) or a wide area network such as the Internet according to a predetermined communication protocol such as Ethernet. be able to.
- a wireless method such as a mobile phone
- a network On a network, multiple host terminals (not shown) are connected in a transparent state, and a distributed computing environment is constructed. On the network, distribution services such as software, programs, data, and content can be provided.
- the host is a client terminal
- you can download a client application that provides business services such as pre-registration with a content distribution company, download of content, license acquisition, storage of content, and content.
- Procedures such as pre-registration with distributors, downloading of content from content servers, licensing of content from servers, and billing for licenses must be downloaded via the network. Can be.
- the source 'program before compiling and the object' program after compiling can be executed via the network.
- the host operates as a server such as a license server, a content server, a billing server, or a business database server, various servers and applications can be downloaded via the network, and the client terminal of the customer can be downloaded.
- Procedures such as pre-registration with the customer, content distribution, license provision, and billing processing associated with license provision can be executed via the network.
- the external device interface 107 is a device for connecting an external device such as a hard disk drive (HDD) 114 or a media drive 115 to the host 100.
- HDD hard disk drive
- the HDD 114 is an external storage device in which a magnetic disk as a storage carrier is fixedly mounted (well-known), and is superior to other external storage devices in terms of storage capacity and data transfer speed. Placing a software program on the HDD 114 in an executable state is called "installing" the program on the system. Normally, the HDD 114 stores the operating system's program code, application programs, and device 'drivers that the CPU 101 should execute in a non-volatile manner.
- the host is a client terminal
- a client application that provides business services such as pre-registration with a content distribution company, content download, license acquisition, and content storage. can do.
- licenses of content downloaded from a content distributor can be stored on the HDD 114.
- various server applications can be installed on the HDD 114.
- customer-related information required for content distribution work (information on customers themselves, information on clients owned by customers, information on purchased contents, etc.) can be stored on the HDD 114.
- Media 'drive 1 1 5 is a CD (Compact Disc) or MO (M a gneto — A device for loading portable media such as optical discs and DVDs (Digital Versati 1 e Discs) and accessing the data recording surface.
- Portable media is used primarily to back up software 'programs and data' files, etc., as computer-readable data, and to move them between systems (ie, including sales, distribution, and distribution).
- clients, applications, various servers, and applications that provide business services such as pre-registration with content distributors, content download, license acquisition, and content storage, use these portable media.
- portable media can be physically distributed between multiple devices.
- portable media can be used to move content downloaded from content distributors between client terminals.
- portable media may be used to exchange or share customer-related information necessary for content distribution operations (information on customers themselves, information on clients owned by customers, information on purchased content, etc.) between distributors. it can.
- Figure 3 schematically shows the functional configuration when the host operates as a client.
- the client includes a pre-registration unit, a content download unit, a content storage unit, a content transfer processing unit, a license acquisition and management unit, a billing processing unit, and a content reproduction processing unit. It consists of.
- Each of the illustrated function modules is actually realized in a form in which the CPU 101 executes a predetermined program module.
- the pre-registration unit performs pre-registration processing with the license server on the assumption that content is provided from a specific distributor on the client and the license is obtained. Details of the pre-registration process will be described later.
- the content 'download unit performs a process of downloading the desired content from the content-server of the distributor registered in advance. Usually, after the user selects the content via the browser screen of the client, the download of the content is started. However, since the process of downloading the content itself is well known, it will not be further described in this specification.
- the downloaded content is It is stored in the storage unit.
- License acquisition The management unit acquires the license required to use the content downloaded from the content server or the content acquired from another client of the same user via the content movement processing unit from the license server. In addition to managing the acquired licenses and the information acquired during pre-registration.
- the license acquisition management unit performs a license update process on the license server. Details of the license acquisition process and license update process will be described later.
- the license acquisition 'management unit acquires a content copy certificate from the license' server '. Also, record the serial number of the content / copy certificate once imported as “used content copy certificate”. The details of the content copy certificate acquisition process will be described later.
- the license acquisition 'management unit stores the license extracted from the content / copy certificate when the content is copied from another client with the content / copy certificate.
- the billing processor connects to the billing server on the distributor side at the time of distribution, and uses (content playback) content downloaded from the content server or content obtained from another client of the same user via the content movement processor. Payment processing for the license for which the license has been obtained and the price for which the content / copy certificate has been obtained.
- the price for acquiring the content 'copy certificate may be paid or free.
- the discount may be applied to the normal license acquisition fee.
- the content reproduction processing unit retrieves the desired content from the content storage unit, and obtains the license by using the license stored in the license acquisition / management unit (or retrieved from the content / copy certificate). 'Data It decodes and decodes and performs the reproduction process.
- the content playback processing means that music data is output as sound or video data is displayed and output from a display.
- the content transfer processing unit transfers content to and from another client within the same user.
- the content transfer processing unit extracts the content to be moved from the content storage unit, adds the license, the content obtained from the server, and the copy certificate. It is written on a portable recording medium or transferred via a wired or wireless communication path.
- the content is read from the loaded recording medium or the content is received via a wired or wireless communication path.
- the moved content is stored in the content storage unit.
- the content transfer processing unit extracts the license from the content copy certificate attached to the content and stores it in the license acquisition / management unit.
- Fig. 4 schematically shows the functional configuration when the host operates as a license server.
- the license server includes a pre-registration unit, a license issuing unit, a license storage unit, and a database management unit.
- Each of the illustrated functional modules is actually realized in a form in which the CPU 101 executes a predetermined program module.
- the pre-registration unit performs pre-registration processing of the client on the premise that the client uses the content distribution service provided by the distribution company. Details of the pre-registration process will be described later.
- the license storage unit stores licenses required for each content provided by the distributor. Each license can be searched using license designation information such as license ID.
- the license issuance unit retrieves the license necessary for the client to use the downloaded content from the license storage unit and sends it to the requesting client.
- the license issuance department will issue a client Notify the accounting server to charge the account.
- the license issuing unit also has a function to add a leaf ID to the license (a function to process the license extracted from the license storage unit).
- the license issuance unit issues a content copy certificate to certify that the content is valid when the user moves the content from one client to another client, and sends it to the client of the content transfer source. Send.
- the license issuing unit notifies the billing server to charge the client with the issuance of the content copy certificate.
- the price for acquiring the content / copy certificate may be paid or free.
- the discount may be applied to the normal license acquisition fee.
- the license issuance unit also performs a license renewal process in response to an expired license renewal request from the client side. Details of the license update process will be described later.
- the database management unit registers and updates the contents of the pre-registration in the pre-registration unit and the license information issued by the license issuing unit in the business database.
- Fig. 5 schematically shows the functional configuration when the host operates as a content server.
- the content server includes a transmission / reception unit, a distribution content storage unit, a content extraction unit, and an encryption unit.
- Each of the illustrated functional modules is actually realized in a form in which the CPU 101 executes a predetermined program module.
- the transmission / reception unit performs processing for receiving a content request (content specification information) from a client and transmitting specified content data to a requesting client.
- the distribution content storage unit stores and manages the content data provided by the distribution company for the distribution service.
- the content data is ATRAC (A dapti V e Transform Acoustic Code). ing) It is stored in the distribution content storage unit in a state where it has been encoded by the three methods.
- the content extraction unit analyzes the specification information of the content received by the transmission / reception unit, extracts the specified content from the distribution content storage unit, and passes it to the encryption unit.
- Encryption unit the content to be delivered to the client, encrypted with the content 'key K c.
- the database management unit registers and updates information on the content distribution service provided to the client in the business database.
- the clients A and B Prior to the content sharing process, the clients A and B access the license servers A and B, respectively, and perform the pre-registration process.
- leaf ID, DNK (device 'node-key), private and public key pair of each client, license' public key of server ', and certificate of each public key Get “Service 'Data” including.
- the leaf ID represents the identification information assigned to each client
- DNK is to decode the content ⁇ key K c being encrypted is included in the EKB (Enabling proc) corresponding to the license Required device 'node.key'.
- DNK is described in the specification of WO 02/0804446, which has already been assigned to the present applicant, but since the detailed mechanism itself is not directly related to the gist of the present invention, The description is omitted in this specification.
- Figure 6 shows the processing procedure for the client to pre-register with the license server in the form of a flowchart.
- the client sends a service @ data request to the license server of the content distribution company to which the client is to be registered (step S1).
- the license server Upon receiving the service / data request from the client, the license server sends a user information request to the requesting client in response to the request (step S11).
- the client Upon receiving the user information request, the client displays a message prompting the user information input and a screen for inputting the user information on a display or the like (Step S). 2).
- the user inputs user information such as personal information and payment information of the user via an input device such as a keyboard and a mouse, the user information is transmitted to the license server (step S3).
- authentication is performed using a user ID and password.
- user information is handled by authentication (device authentication) using a client ID (device ID) or a combination of device authentication and user authentication. May be done.)
- the license server When the license server receives the user information, it allocates to the requesting client a leaf that has not been allocated among the leaves under the node of the category allocated to the license server, and allocates it to the license server from that leaf.
- a node / key pair assigned to a node on the path to a node of a given category is generated as a device / node 'key DNK.
- the license server After transmitting the service data, the license server records the user information in association with the life ID, and registers the contents of the pre-registration in the business database (step S14). ).
- the client When the client receives the service data from the license server, the client performs a license registration and stores the data in the license acquisition management unit (step S4).
- the license server registers the client and the user, and the client can receive the service data including the device node 'key necessary for using the desired content distribution service.
- the business-related data base servers A and B of each distributor have a plurality of tables as shown below to manage customer-related information.
- Other subsystems can use (see, append, rewrite, etc.) these tables as needed.
- the business database ⁇ server C sends the following information out of the customer-related information stored in the business database ⁇ ⁇ ⁇ It is set up for sharing between the two companies, and both distributors A and B can refer to and update the contents when necessary.
- the content acquired by client A is When the content is stored in client B, a “content 'copy certificate” is added to the content so that client B can be identified, so that the content between clients A and B can be secured while ensuring the protection of the content. Sharing can be realized.
- This content sharing is performed according to the following procedures P1 to P6 as shown in FIG.
- client A has already purchased (or obtained a license for) the content to be moved from the distributor.
- the license 'servers A and B store each other's secret keys in advance.
- the client ID of each client is recorded in the business database in association with the user ID.
- Figure 7 shows the processing procedure on the client A side when downloading content in the form of a flowchart.
- the content download process is started.
- the content server A is accessed via the network interface 106 (step S21).
- a content selection screen (not shown) is displayed on the display screen of the client.
- the user designates desired content on the screen via an input device such as a keyboard and a mouse.
- the client A notifies the content server A of information designating the content (step S22). Further, the user ID is notified to the content server A (step S23).
- the content server A responds to the notification of the content designation information. Then, the corresponding content is transmitted after being encrypted.
- Client A receives the encrypted content (step S24) and stores it in the content storage unit (step S25).
- FIG. 8 is a flowchart illustrating a processing procedure of the content server when the content is downloaded.
- the content server A waits for access from the client A (step S31). Then, when it is determined that the access has been received, the information for designating the content transmitted from the client A is fetched (step S32). The information specifying this content corresponds to the information notified by client A in step S22 of the flowchart shown in FIG.
- the content server A reads out the content specified by the information taken in the preceding step S32 from the stored contents (step S33).
- Step S 3 4 the read content, that encrypts using the content 'key K c (Step S 3 4). Since the ⁇ content ’data stored in the distribution content storage unit has already been encoded by the ATRAC 3 method, the encoded content data is encrypted. Step S34 can be omitted by encrypting the content data in advance and storing it in the distribution content storage unit.
- a license ID corresponding to the content ID is fetched from the business database A (step S35).
- the header that constitutes the format for transmitting the encrypted content data is provided with key information (described later) required to decrypt the encrypted content, and a license ID that identifies the license required to use the content. Is added (step S36).
- step S34 data obtained by formatting the content encrypted in step S34 and the header to which the key and the license ID are added in step S36 are transmitted to the requesting client A (step S3). 7).
- step S38 the user ID of the client A and the content ID of the transmitted content are recorded in the business database A (step S38).
- Business database A The recorded content is also reflected in the business database C by the synchronous processing, and can be used by the other distributor B.
- FIG. 9 shows a configuration example of a data format used when content is distributed from content @ server A to client A.
- this format is composed of a header (Header) and data (Data).
- the header includes the content information (Content Information), the license ID (License ID), and the rice key block (Enabling Key Block: EKB). )), And data K EKB (K c ) as a content 'key K c coded using the key K EKB generated from EKB .
- the EKB is described in WO 02/080446, which has already been assigned to the present applicant, but is not directly related to the gist of the present invention, and thus the description thereof is omitted in this specification.
- the content information includes a content ID (CID) as identification information for identifying content-data that is formatted as data, and information such as a codec method of the content.
- CID content ID
- Each encrypted block consists of an initial 'beta' (IV: Initia 1 Vector), a seed (S eed), and data E K , C (Da ta) obtained by encrypting the content data with a key K ' c. Be composed.
- the key K ′ c is composed of a content c key K c and a value calculated by applying a hash function to a seed set by a random number, as shown by the following equation.
- K, C H ash (K c, S eed) initials. Betatoru IV and the seed S eed is set to a different value for each encryption block.
- This encryption is performed every 8 bytes by dividing the content data in units of 8 bytes.
- the subsequent 8-byte encryption uses the result of the preceding 8-byte encryption. It is performed in CBC (Ciher Block Chaining) mode.
- the initial vector IV is used as the initial value to perform decoding.
- the processing procedure of this encryption is not directly related to the gist of the present invention described in WO 02/0 80446, which has already been assigned to the present applicant, and will not be further described in this specification.
- the encryption method, the present invention is not limited to this, content to single, the content ⁇ data in the key K c but it may also be configured to encrypt.
- client A can freely acquire content from content server A.
- FIG. 10 shows a processing procedure for playing back the content downloaded on the client A side in the form of a flowchart.
- the client A acquires the identification information (CID) of the content specified by the user through the operation of the input device such as the keyboard and the mouse (step S41).
- This identification information includes, for example, a title of the content, a number assigned to each stored content, and the like.
- the license ID corresponding to the content is read.
- This license ID is Is described in the header of the data.
- step S42 it is determined whether or not the license corresponding to the read license ID has already been acquired by the client and stored in the license acquisition / management unit (step S42).
- the process proceeds to step S43, and a license acquisition process (described later) is executed.
- step S42 If it is determined in step S42 that the license has already been obtained, or if the license has been obtained as a result of performing the license obtaining process in step S43, the obtained license is further It is determined whether it is within the expiration date (step S444). Whether or not the license is valid is determined by comparing the expiration date (described later) specified in the license with the current date and time measured by the client system-timer. If it is determined that the license expiration date has already expired, the flow advances to step S45 to execute license update processing (described later).
- step S44 If it is determined in step S44 that the license has expired, or if the license has been renewed in step S45, it is further determined whether the license is valid (step S46) . License validity can be enforced using the digital signature (described below) included in the license. If the license is not valid, error processing is performed (step S47), and the entire processing routine ends. The error processing may be processing for acquiring a valid license again.
- step S46 If it is determined in step S46 that the license is valid, the corresponding encrypted content 'data is read from the content storage unit (step S48). Then, the content is encrypted 'data, encryption blocks disposed in the data shown in FIG. 9, the content' is decrypted using the key K c (stearyl-up S 4 9).
- the decrypted content data is decoded, and the content is reproduced (step S50).
- the content playback processing refers to outputting music data as sound or outputting video data from a display.
- FIG. 11 shows the routine executed in step S43 in the flowchart shown in FIG.
- the detailed procedure of the license acquisition process is shown in the form of a flowchart.
- Client A accesses the license 'server A in advance and performs the registration process, so that the leaf ID, DNK (device-node key), client A's private key and public key pair, license' server Obtained the service's data, including the public key and public key certificate (see above and Figure 6).
- DNK device-node key
- client A's private key and public key pair the license' server Obtained the service's data, including the public key and public key certificate (see above and Figure 6).
- the leaf ID represents the identification information assigned to each client
- DNK is to decrypt the content key K c being encrypted is included in the E KB (enabling block) corresponding to the license
- the required device 'node' is key.
- the client A inputs the license specifying information to be updated, the user ID and the password through the operation of the user's input device such as the keyboard and the mouse (steps S61 and S62).
- the client A sends a license request including the input user ID and password, the license designation information, and the leaf ID included in the service data to the license server B (step S63).
- License 'Server A issues a license based on the user ID and password, and the license designation information, and sends it to client A, the requesting client.
- the details of the license provision process by License Server A will be described later.
- the client A can receive the license from the license server A (step S64)
- the license is stored in the license acquisition and management unit (step S65).
- step S64 when the license cannot be received from the license @ server A (step S64), a predetermined error processing is executed (step S66), and the entire processing routine ends.
- the error processing referred to here includes, for example, an operation of prohibiting the activation of the content reproduction processing unit because a license for using the content cannot be obtained.
- Client A can use the content for the first time after acquiring the license corresponding to the license ID attached to the content data.
- the license acquisition processing as shown in FIG. 11 can be performed not before but after downloading the content.
- Figure 12 schematically shows the data structure of the license provided from the license server to the client.
- the license includes terms of use, leaf ID, and a digital signature of the license server.
- the terms of use include the expiration date for using the content based on the license, the download expiration date for downloading the content based on the license, and copying of the content based on the license.
- the number of times the content can be copied (permitted number of copies), the number of checkouts, the maximum number of checkouts, the right to record the content on a recording medium such as a CD-R based on the license, Includes information such as the number of copies that can be made, the right to transfer the license to ownership (purchased status), and the obligation to take a usage log.
- FIG. 13 shows that license server A provides a license to client A, which is executed in response to a license request from client A (step S63 in the flowchart shown in FIG. 11). Is shown in the form of a flowchart.
- License server A waits for access from client A (step S71). Then, when the access is received from the client A, the client A requests the client A to transmit the user ID, the password, and the license ID. On the other hand, since the client A transmits the user ID, the passcode, the leaf ID, and the license designation information (license ID) as the processing of step S63, the license server A fetches these (step S63). S72).
- the license server A requests the business database server A to perform a process of collating the user ID and the password (step S73), and checks the validity of the client A (step S74). If the collation fails, a predetermined error process is executed (step S75), and the entire processing routine ends. In this case, no license is issued to Client A. On the other hand, if the matching process is successfully completed, the license server A accesses the billing server A to request a credit process (step S76). In response to the credit processing request from the license server A, the billing server A investigates the past payment history corresponding to the user ID and the password, and the user does not pay for the license in the past. Check if there is any unfavorable performance (step S77).
- the billing server A when it is determined that the credit is not appropriate, for example, there is an unfavorable payment result, the billing server A returns a credit result disallowing the license grant to the license server A.
- the license server A executes a predetermined error process (step S78), and ends the entire process routine. In this case, no license is issued to Client A.
- the license corresponding to the license designation information is retrieved from the license storage unit (step S79).
- the license stored in the license storage unit describes in advance information such as the license ID, version, creation date and expiration date.
- License 'Server A adds leaf ID to the retrieved license (step S80).
- the license server A selects the use condition associated with this license (step S81). Alternatively, if the user specifies a use condition at the time of the license request, the use condition is added to the use condition prepared in advance as necessary. Then, the selected use conditions are added to the license.
- the license server A generates a license as shown in FIG. 12 by applying an electronic signature to the license using its own private key (step S82). Then, the license is transmitted to the requesting client A (step S83). Next, the license server A stores the license (including the use condition and the leaf ID) just transmitted, in association with the user ID and the password. Further, it accesses the business database server A and records the license ID of the transmitted license in association with the user ID (step S84). Business database The contents recorded in A are also reflected in the business database C by the synchronous processing, and can be used by the other distribution company B.
- the license server A accesses the charging server A and executes a charging process for the user corresponding to the user ID and the password (step S85).
- the billing server A executes a billing process for the corresponding user in response to the billing process request.
- the billing server A may support credit settlement using a credit card, etc. ⁇ immediate settlement using a debit card, payment by electronic money, cash payment, and transfer to a financial institution.
- the form of the charging process is not directly related to the gist of the present invention, it will not be further described in this specification.
- the user does not pay for the billing process, the user loses credit and will not be able to receive a license even if the user requests to grant a license. That is, when the user loses the credit, as described above, the credit server returns a credit result indicating that the grant of the license is not permitted. Therefore, the license and the server execute error processing in step S78. You. In the error processing, for example, a message to the effect that a license cannot be granted is output to the requesting client, and the processing ends. Also, the requesting client cannot receive the license, that is, it cannot use the content (decrypt the encryption).
- FIG. 14 shows, in the form of a flowchart, a detailed procedure of license update processing for the license server performed by the client in step S45 in the flowchart shown in FIG.
- the client A inputs the license designation information, the user ID, and the password through the operation of the user's input device such as a keyboard and a mouse (steps S91 and S92).
- the client A transmits a license update request including the input user ID and password and the license designation information to the license server (step S93).
- License 'Server A responds to the license renewal request and submits usage conditions (described later). On the other hand, Client A receives the offered license agreement This is displayed and output to the user (step S94).
- the user operates an input device such as a keyboard or a mouse to select a predetermined usage condition from the usage conditions displayed on the screen or to add a new predetermined usage condition.
- the application for purchasing the usage conditions (ie, the conditions for renewing the license) selected in this manner is transmitted to the license server A (step S95).
- the license server A sends final usage conditions in response to the purchase request from client A (described later).
- the client A receives the use condition from the license server A (step S96), and updates it as the corresponding license use condition (step S97).
- FIG. 15 shows details of updating the expired license executed by the license server corresponding to step S45 (FIG. 14) in the flowchart shown in FIG.
- the processing procedure is shown in the form of a flowchart.
- the license 'server A Upon receiving access from the client A (step S101), the license 'server A receives the license update request (described above) transmitted by the client A (step S102).
- the license server A reads out the usage condition (usage condition to be updated) corresponding to the license whose update is requested from the license storage unit, and transmits it to the requesting client A (step S103).
- the received usage conditions are displayed and output to the user. Then, the user operates an input device such as a keyboard / mouse to select a predetermined usage condition from the usage conditions displayed on the screen, or to newly add the predetermined usage condition.
- An application to purchase the terms of use (ie, the terms for renewing the license) selected in this way is sent to license server A (described above).
- the server When the license 'server A is requested to purchase the usage conditions from the client A, the server generates data corresponding to the usage conditions and transmits the data to the client A (step S104).
- Client A receives the terms of use from license server A and updates them as the terms of use for the corresponding license (described above).
- the mechanism of processing in which the client uses the content supplied from the content server based on the license supplied from the license server is summarized with reference to FIG.
- the content is provided from the content server to the client, and the license is supplied from the license server to the client.
- Near point Tsu is' is encrypted by the key K c (En c (K c , Co nte nt)), content 'content key K c is a key obtained from a root' key KR (EKB, Figure Content (corresponding to the key KEKBC in the data shown in Fig. 9) and encrypted (En c (KR, K c )), encrypted and added to the content together with the EKB and provided to the requesting client Is done.
- the EKB in the example shown in FIG. 21 includes a root key KR that can be decrypted by DNK (En c (DNK, R)) 0 .
- the root key KR can be obtained from EKB using the DNK included in the service 'data.
- FIG. 16 shows, in the form of a flowchart, a processing procedure for client A to acquire a content copy certificate from license server A.
- step S111 When the user operates the display screen via an input device such as a keyboard / mouse, the process of issuing a content copy certificate is started. In response, access is made to the license server A via the network interface 106 (step S111).
- a content selection screen (not shown) is displayed on the client display screen.
- the user specifies desired content through an input device such as a keyboard and a mouse, and inputs a license ID and a client ID of a client (client B in this case) to be copied.
- the client A notifies the license server A of the information designating the content together with the license ID and the client ID of the copy destination (step S112).
- the license server A is notified of its own user ID and password (step S113).
- License-Server A issues a content copy certificate, Reply this to Client A.
- the client A receives the transmitted content copy certificate (step S114) and temporarily stores it (step S115).
- FIG. 17 is a flowchart showing a processing procedure for the license server A to issue a content copy certificate in response to a request from the client A.
- License server A waits for access from client A (step S 1 2 1). Then, when it is accessed from Client A, it requests Client A to send information specifying the content, license ID, user ID and password, and client ID of the copy destination. On the other hand, since the client A transmits these pieces of information as the processing of steps S112 and S113, the license server A fetches these information (step S122).
- the license server A requests the business-related database server A to perform a collation process of the user ID and the password (step S123), and checks the validity of the client A (step S124). ). If the collation fails, a predetermined error process is executed (step S125), and the entire processing routine ends. In this case, no content copy certificate is issued to Client A.
- step S124 determines whether client A has already purchased the specified content for business database server A (whether the license has been obtained)
- a request is made for a collation process (step S 1 26), and it is checked whether client A has purchased the content (step S 1 27).
- step S1228 a predetermined error process is executed (step S128), and the entire processing routine ends. In this case, no content copy certificate is issued to Client A. Note that the error processing in step S127 may be processing for acquiring a valid license again.
- step S122 Request to the server C to determine whether the user of client A actually has client B indicated by the client ID received in step S122 (step S122) ), It is checked whether the same user has the client B (step S130).
- step S1311 a predetermined error process is executed (step S1311), and the entire processing routine ends. In this case, no content copy certificate is issued to client A. Note that the error processing in step S 13 1 may be processing for pre-registering client B again.
- step S130 If the collation processing in step S130 is completed successfully, the content is further copied to the business database server A by copying the content from the requesting client A to the client B.
- a confirmation process is requested to confirm whether or not to issue a permit (step S1332), and it is checked whether to issue a content copy certificate (step S133).
- step S134 if the confirmation processing has failed, a predetermined error processing is executed (step S134), and the entire processing routine ends. In this case, no content copy certificate is issued to Client A.
- step S133 the business database server C is accessed to acquire the leaf ID of client B (step S135).
- license information corresponding to the license ID acquired in step S122 is acquired (step S136).
- a license is created to permit the client B to use the content (step S137).
- the structure of the created license is as shown in Figure 12.
- the license server A digitally signs the license with the license key of the license server B (step S138).
- a content copy certificate is created using the information obtained in step S122, and an electronic signature is given to this certificate using the license key of server B (step S139).
- License 'Servers A and B have their own private keys (as described above).
- the license / server A transmits the content / copy certificate with the electronic signature to the requesting client A (step S140).
- the contents recorded in the business database A are also reflected in the business database C by synchronous processing, and can be used by the other distribution company B.
- the price for obtaining the content / copy certificate may be paid or free.
- the discount may be applied to the normal license acquisition fee.
- step S139 When issuing the content / copy certificate for a fee, for example, a charging process is inserted between step S139 and step S140. The charging process at this time will be described below.
- License @ server A accesses billing server A and requests credit processing.
- the billing server A checks the past payment history and the like corresponding to the user ID and password, and the user does not want to pay the license in the past. Check if you have a track record. If the credit is OK, the charging process is executed for the user corresponding to the user ID and the password.
- the charging server A returns a credit result to the license server A to disallow the grant of the content ⁇ copy certificate ⁇ .
- the license server A executes a predetermined error process, and ends the entire process process routine. In this case, no content copy certificate is issued to client A.
- Figure 18 schematically shows the data structure of the content / copy certificate issued by the license server.
- the content 'copy certificate' includes a serial number of the certificate, a content ID of the content to be copied, a license, an electronic signature, and the like.
- the license is digitally signed with the private key of the license server (in this case, license server B) that registers client 1 (in this case, client B) to be copied (described above).
- An electronic signature is created using the license 'server B's private key for the three values of the certificate's serial number, content ID, and license.
- the content is copied with a content / copy certificate and the content is moved.
- the client A copies the downloaded content to a portable recording medium and loads it onto the client B to move the content.
- processing is performed in which the client A fetches the content from the content storage unit and writes it to the recording medium.
- the client B side a process of reading the content recorded on the recording medium and storing it in the content storage unit is performed.
- the method of transferring unlicensed content to another client is not limited to this.
- the user himself / herself may exchange contents between clients by wired or wireless communication.
- the content distributor may automatically distribute the content to another client owned by the same user.
- Fig. 19 shows, in the form of a flow chart, the processing procedure to be performed on the client A, which is the source of the transfer of content between clients.
- the content data to be moved is extracted from the content storage unit and copied to a recording medium (step S 15 1).
- the content / copy certificate acquired according to the above-described processing procedure is copied to a recording medium (step S152).
- step S153 the content 'copy certificate in the client A is deleted.
- step S153 can be omitted.
- this content can be used by loading the recording medium on which the content 'data and the content copy certificate have been copied on the client A side and importing it into the inside.
- FIG. 20 shows, in the form of a flowchart, a processing procedure for capturing the content on the client B side where the content is copied.
- the client B fetches the content data and the content copy certificate from the loaded recording medium and stores them (step S161).
- step S 162 the electronic signature of the content copy certificate is verified using the public key of the license server B (step S 162), and the signature is correct, that is, the content copy certificate is falsified. It is checked whether there is (step S166).
- step S163 if it is determined that the signature is incorrect, that is, the content 'copy certificate has been tampered with, the process proceeds from the branch No of step S163 to step S164, where a predetermined error processing is performed. To terminate the entire processing routine. In this case, the license cannot be extracted from the content 'copy certificate, so the content cannot be used on Client B.
- step S16 If it is determined that the signature is correct, then, using the serial number of the content copy certificate, it is verified whether the same content copy certificate has already been used (step S16). 5), it is checked whether there is a history using the content 'copy certificate (step S166). Here, if there is a history using the same content.
- the copy certificate the process proceeds from the branch No of step S166 to step S167, where a predetermined error processing is performed to execute the entire processing routine. To end. In this case, since the license cannot be extracted from the content 'copy certificate', the content cannot be used on client B.
- step S166 If there is no history using the same content / copy certificate, verify that the content ID of the content imported from the recording medium matches the content ID described in the content / copy certificate (step In step S166, it is checked whether both content IDs match (step S169).
- step S169 branch No If the two content IDs do not match, the process advances from step S169 branch No to step S170, executes a predetermined error process, and ends the entire processing routine. .
- the license cannot be extracted from the content.copy certificate, so that the content cannot be used on client B.
- step S171 If both content IDs match, the license in the content 'copy certificate is extracted and stored (step S171).
- the license ID of the extracted license is recorded in the content header (step S172), and this is stored in the content storage unit.
- the content reproduction processing unit performs the normal content reproduction processing (see the above and FIG. 10). That is, the content can be reproduced.
- serial number of the content copy certificate is recorded in the client B as "used content-copy certificate" (step S173).
- the algorithm for checking the validity of the content copy certificate corresponding to steps S166, S166, and S169 is desirably configured as a tamper-resistant process.
- the client B the content and data captured according to the processing procedure described above can be played back according to the content playback processing shown in FIG.
- the client B acquires the identification information (CID) of the content specified by the user through the operation of the input device such as the keyboard and the mouse (step S41).
- the license ID corresponding to the content is read.
- step S42 it is determined whether the license corresponding to the read license ID has already been acquired by the client and stored in the license acquisition / management unit (step S42).
- step S43 it is determined that the license has already been acquired because the license extracted from the content copy certificate is stored in the license acquisition management unit.
- step S44 it is determined whether or not this license has expired. If it is determined that the license expiration date has already expired, the flow advances to step S45 to execute license renewal processing.
- Client B performs license update processing according to the processing procedure shown in FIG.
- step S44 If it is determined in step S44 that the license has expired, or if the license has been renewed in step S45, it is further determined whether the license is valid (step S46). . If the license is not valid, perform error processing (step S47) and then
- step S46 If it is determined in step S46 that the license is valid, the corresponding encrypted content data is read from the content storage unit (step S48). Then, the content is encrypted 'data, encryption blocks disposed in the data shown in FIG. 9, the content' is decrypted using the key K c (stearyl-up S 4 9).
- the charging process when charging occurs in order to share and use the content purchased by one client with another client, the charging process is performed only by using the other client. Can improve customer convenience.
- the reproduction environment information (play list, reproduction setting (volume setting, continuous reproduction setting, etc.), GUI screen, bookmark to the music to be purchased, etc.) set or updated on one client, and It can be reflected in other clients.
Abstract
Description
Claims
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AU2003296093A AU2003296093A1 (en) | 2003-01-23 | 2003-12-24 | Content delivery system, information processing apparatus or information processing method, and computer program |
US10/507,212 US20050144019A1 (en) | 2003-01-23 | 2003-12-24 | Contents delivery system, information processing apparatus or information processing method and computer program |
EP03786281A EP1586999A1 (en) | 2003-01-23 | 2003-12-24 | Content delivery system, information processing apparatus or information processing method, and computer program |
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Country | Link |
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US (1) | US20050144019A1 (ja) |
EP (1) | EP1586999A1 (ja) |
JP (1) | JP3791499B2 (ja) |
KR (1) | KR20050101108A (ja) |
CN (1) | CN1326053C (ja) |
AU (1) | AU2003296093A1 (ja) |
WO (1) | WO2004066154A1 (ja) |
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- 2003-12-24 AU AU2003296093A patent/AU2003296093A1/en not_active Abandoned
- 2003-12-24 EP EP03786281A patent/EP1586999A1/en not_active Withdrawn
- 2003-12-24 CN CNB2003801003613A patent/CN1326053C/zh not_active Expired - Fee Related
- 2003-12-24 KR KR1020047014975A patent/KR20050101108A/ko not_active Application Discontinuation
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Also Published As
Publication number | Publication date |
---|---|
KR20050101108A (ko) | 2005-10-20 |
JP3791499B2 (ja) | 2006-06-28 |
CN1692339A (zh) | 2005-11-02 |
EP1586999A1 (en) | 2005-10-19 |
JP2004227283A (ja) | 2004-08-12 |
US20050144019A1 (en) | 2005-06-30 |
AU2003296093A1 (en) | 2004-08-13 |
CN1326053C (zh) | 2007-07-11 |
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