CA2413880A1 - Encryption and content control in a digital broadcast system - Google Patents

Encryption and content control in a digital broadcast system Download PDF

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Publication number
CA2413880A1
CA2413880A1 CA002413880A CA2413880A CA2413880A1 CA 2413880 A1 CA2413880 A1 CA 2413880A1 CA 002413880 A CA002413880 A CA 002413880A CA 2413880 A CA2413880 A CA 2413880A CA 2413880 A1 CA2413880 A1 CA 2413880A1
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CA
Canada
Prior art keywords
packets
psi
identifying information
program
duplicate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002413880A
Other languages
French (fr)
Other versions
CA2413880C (en
Inventor
Leo M. Jr. Pedlow
Brant L. Candelore
Henry Derovanessian
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sony Electronics Inc
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Individual
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Filing date
Publication date
Priority claimed from US10/037,914 external-priority patent/US7124303B2/en
Application filed by Individual filed Critical Individual
Publication of CA2413880A1 publication Critical patent/CA2413880A1/en
Application granted granted Critical
Publication of CA2413880C publication Critical patent/CA2413880C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/45Management operations performed by the client for facilitating the reception of or the interaction with the content or administrating data related to the end-user or to the client device itself, e.g. learning user preferences for recommending movies, resolving scheduling conflicts
    • H04N21/462Content or additional data management, e.g. creating a master electronic program guide from data received from the Internet and a Head-end, controlling the complexity of a video stream by scaling the resolution or bit-rate based on the client capabilities
    • H04N21/4623Processing of entitlement messages, e.g. ECM [Entitlement Control Message] or EMM [Entitlement Management Message]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/21Server components or server architectures
    • H04N21/222Secondary servers, e.g. proxy server, cable television Head-end
    • H04N21/2221Secondary servers, e.g. proxy server, cable television Head-end being a cable television head-end
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/236Assembling of a multiplex stream, e.g. transport stream, by combining a video stream with other content or additional data, e.g. inserting a URL [Uniform Resource Locator] into a video stream, multiplexing software data into a video stream; Remultiplexing of multiplex streams; Insertion of stuffing bits into the multiplex stream, e.g. to obtain a constant bit-rate; Assembling of a packetised elementary stream
    • H04N21/23614Multiplexing of additional data and video streams
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/236Assembling of a multiplex stream, e.g. transport stream, by combining a video stream with other content or additional data, e.g. inserting a URL [Uniform Resource Locator] into a video stream, multiplexing software data into a video stream; Remultiplexing of multiplex streams; Insertion of stuffing bits into the multiplex stream, e.g. to obtain a constant bit-rate; Assembling of a packetised elementary stream
    • H04N21/2362Generation or processing of Service Information [SI]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/238Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
    • H04N21/2389Multiplex stream processing, e.g. multiplex stream encrypting
    • H04N21/23895Multiplex stream processing, e.g. multiplex stream encrypting involving multiplex stream encryption
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00Television systems
    • H04N7/16Analogue secrecy systems; Analogue subscription systems
    • H04N7/162Authorising the user terminal, e.g. by paying; Registering the use of a subscription channel, e.g. billing
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00Television systems
    • H04N7/16Analogue secrecy systems; Analogue subscription systems
    • H04N7/167Systems rendering the television signal unintelligible and subsequently intelligible
    • H04N7/1675Providing digital key or authorisation information for generation or regeneration of the scrambling sequence

Abstract

A selective encryption encoder has a packet identifier that identifies packets of a specified packet type forming a part of a program. A packet duplicator duplicates the identified packets to produce first and second sets of the identified packets. A PMT (program map table) inserter generates temporary identifying information that identifies the first and second sets of identified packets inserts the temporary identifying information as user private data in a program map table (PMT) forming a part of the transport program specific information (PSI). The data are then sent to and received from a primary encryption encoder to encrypt the first set of identified packets under a first encryption method. A secondary encrypter encrypts the second set of identified packets under a second encryption method.
The PSI is then modified at a PSI modifier to remove the temporary identifying information and to correctly associate the first and second sets of identified packets and the unencrypted packets with the program.

Claims (29)

1. A selective encryption method, comprising:
examining unencrypted packets of data in the digital video signal to identify a specified packet type;
duplicating the packets of the specified packet type to produce duplicate packets;
identifying the duplicate packets by a first packet identifier (PID);
identifying remaining unencrypted packets by a second packet identifier (PID);
replacing the packets of the specified packet type with the first duplicate packets;
generating identifying information that identifies the first duplicate packets, and the unencrypted packets;
storing the identifying information as transport program specific information (PSI);
creating a data stream comprising the PSI, the first duplicate packets, and the unencrypted packets into the data stream; and sending the data stream to a primary encryption encoder.
2. The method according to claim 1, wherein the identifying information is stored as user private data a program map table (PMT) in the transport PSI.
3. The method according to claim 1, further comprising:
receiving a data stream back from the primary encryption encoder;
reading a program map table (PMT), a program association tables (PAT) and the identifying information from the transport PSI; and mapping the PIDs associated with at least one of the first duplicate packets and the unencrypted packets to values stored in the identifying information.
4. The method according to claim 3, further comprising deleting the identifying information from the PSI,
5. The method according to claim 1, further comprising:
receiving a data stream back from the primary encryption encoder;
reading a program map table (PMT), a program association tables (PAT) and the identifying information from the transport PS1; and modifying the PSI to reflect any remapping the PIDs in the primary encryption encoder.
6. The method according to claim 1, further comprising deleting the identifying information from the PSI.
7. A computer readable medium storing instructions which, when executed on a programmed processor, carry out the selective encryption method according to claim 1.
8. The computer readable medium of claim 7, wherein the medium comprises one of an electronic storage medium and a carrier wave.
9. An electronic transmission medium carrying a digital video signal encrypted by the method according to claim 1.
10. A selective encryption method, comprising:
examining unencrypted packets of data in the digital video signal to identify a specified packet type;
duplicating the packets of the specified packet type to produce first and second duplicate packets;
identifying the first duplicate packets by a first packet identifier (PID);
identifying the second duplicate packets by a second packet identifier (PID);
identifying unencrypted packets by a third packet identifier (PID);
replacing the packets of the specified packet type with the first duplicate packets and the second duplicate packets;
generating identifying information that identifies the first duplicate packets, the second duplicate packets and the unencrypted packets;
storing the identifying information as transport program specific information (PSI);
creating a data stream comprising the PSI, the first duplicate packets, the second duplicate packets and the unencrypted packets into the data stream; and sending the data stream to a primary encryption encoder.
11. The method according to claim 10, wherein the identifying information is stored as, user private data a program map table (PMT) in the transport PSI.
12. The method according to claim 10, further comprising:
receiving a data stream back from the primary encryption encoder;
reading a program map table (PMT), a program association tables (PAT) and the identifying information from the transport PSI; and mapping the PIDs associated with at least one of the first duplicate packets, the second duplicate packets and the unencrypted packets to values stored in the identifying information.
13. The method according to claim 12, further comprising deleting the identifying information from the PSI.
14. The method according to claim 10, further comprising:
receiving a data stream back from the primary encryption encoder;
reading a program map table (PMT), a program association tables (PAT) and the identifying information from the transport PSI; and modifying the PSI to reflect any remapping the PIDs in the primary encryption encoder.
15. The method according to claim 10, further comprising deleting the identifying information from the PSI.
16. A computer readable medium storing instructions which, when executed on a programmed processor, carry out the selective encryption method according to claim 10.
17. The computer readable medium of claim 16, wherein the medium comprises one of an electronic storage medium and a carrier wave.
18. An electronic transmission medium carrying a digital video signal encrypted by the method according to claim 10.
19. A selective encryption encoder, comprising:
a packet identifier that identifies packets of a specified packet type forming a part of a program;
a packet duplicator, receiving an output from the packet identifier, that duplicates the identified packets to produce first and second sets of the identified packets;
means for generating temporary identifying information that identifies the first and second sets of identified packets and for inserting the temporary identifying information as transport program specific information (PSI); and means for sending and receiving packets to and from a primary encryption encoder to encrypt the first set of identified packets under a first encryption method.
20. The selective encryption encoder of claim 19, wherein the temporary identifying information is stored as user private data in a program map table.
21. The selective encryption encoder of claim 19, further comprising:
a secondary encrypter for encrypting the second set of identified packets under a second encryption method; and means for modifying the PSI to remove the temporary identifying information and to correctly associate the first and second sets of identified packets with the program.
22. The selective encryption encoder of claim 21, wherein the means for modifying the PSI further modifies the PSI to correctly associated unencrypted packets with the program.
23. The selective encryption encoder of claim 19, further comprising:
a secondary encrypter for encrypting the second set of identified packets under a second encryption method;
means for modifying the PSI to remove the temporary identifying information;
and a PID remapper that remaps the PIDs associated with the first and second identified packets to correctly associate the first and second sets of identified packets with the program.
24. The selective encryption encoder of claim 23, wherein the PID remapper further remaps PIDs associated with unencrypted packets to correctly associate the unencrypted packets with the program.
25. A selective encryption encoder, comprising:
means for receiving a demodulated clear data stream of unencrypted packets carrying a program;
a PID remapper that remaps packet identifiers (PIDs) associated with the program;
a packet identifier, receiving an output from the PID remapper, that identifies packets of a specified packet type forming a part of the program;
a packet duplicator, receiving an output of the packet identifier, that duplicates the identified packets to produce first and second sets of the identified packets;
means for generating temporary identifying information that identifies the first and second sets of identified packets and for inserting the temporary identifying information as user private data in a program map table (PMT) forming a part of transport program specific information (PSI);
means for sending and receiving packets comprising the PSI, the first and second sets of identified packets and the unencrypted packets to and from a primary encryption encoder to encrypt the first set of identified packets under a first encryption method;
a secondary encrypter for encrypting the second set of identified packets under a second encryption method;
means for modifying the PSI to remove the temporary identifying information and to correctly associate the first and second sets of identified packets and unencrypted packets with the program; and a quadrature amplitude modulation (QAM) modulator that QAM modulates a data stream associated with the program and comprising PSI, first and second identified packets and the unencrypted packets.
26. A computer readable medium that carries instructions that when executes on a programmed processor to facilitate operation of a selective encryption encoder wherein the instructions comprise:
a code segment that examines unencrypted packets of data in the digital video signal to identify a specified packet type;
a code segment that duplicates the packets of the specified packet type to produce first and second duplicate packets;
a code segment that identifies the first duplicate packets by a first packet identifier (PID);
a code segment that identifies the second duplicate packets by a second packet identifier (PID);
a code segment that identifies unencrypted packets by a third packet identifier (PID);
a code segment that replaces the packets of the specified packet type with the first duplicate packets and the second duplicate packets;
a code segment that generates identifying information that identifies the first duplicate packets, the second duplicate packets and the unencrypted packets;
a code segment that stores the identifying information as transport program specific information (PSI); and a code segment that creates a data stream comprising the PSI, the first duplicate packets, the second duplicate packets and the unencrypted packets into the data stream.
27. The computer readable medium of claim 26, wherein the medium comprises one of an electronic storage medium and a carrier wave.
28. A computer readable medium carrying instructions that, when executed, carry out a selective encryption method, comprising:
examining unencrypted packets of data in the digital video signal to identify a specified packet type;
duplicating the packets of the specified packet type to produce first and second duplicate packets;
identifying the first duplicate packets by a first packet identifier (PID);
identifying the second duplicate packets by a second packet identifier (PID);
identifying unencrypted packets by a third packet identifier (PID);
replacing the packets of the specified packet type with the first duplicate packets and the second duplicate packets;
generating identifying information that identifies the first duplicate packets, the second duplicate packets and the unencrypted packets;
storing the identifying information as transport program specific information (PSI); and creating a data stream comprising the PSI, the first duplicate packets, the second duplicate packets and the unencrypted packets into the data stream.
29. The computer readable medium of claim 28, wherein the medium comprises one of an electronic storage medium and a carrier wave.
CA2413880A 2002-01-02 2002-12-10 Encryption and content control in a digital broadcast system Expired - Lifetime CA2413880C (en)

Applications Claiming Priority (16)

Application Number Priority Date Filing Date Title
US10/038,217 2002-01-02
US10/037,914 US7124303B2 (en) 2001-06-06 2002-01-02 Elementary stream partial encryption
US10/037,914 2002-01-02
US10/037,498 2002-01-02
US10/038,217 US7336787B2 (en) 2001-06-06 2002-01-02 Critical packet partial encryption
US10/037,499 2002-01-02
US10/037,499 US7151831B2 (en) 2001-06-06 2002-01-02 Partial encryption and PID mapping
US10/037,498 US7127619B2 (en) 2001-06-06 2002-01-02 Decoding and decryption of partially encrypted information
US10/038,032 US7139398B2 (en) 2001-06-06 2002-01-02 Time division partial encryption
US10/038,032 2002-01-02
US35532602P 2002-02-08 2002-02-08
US60/355,326 2002-02-08
US37027402P 2002-04-05 2002-04-05
US60/370,274 2002-04-05
US10/273,875 US7218738B2 (en) 2002-01-02 2002-10-18 Encryption and content control in a digital broadcast system
US10/273,875 2002-10-18

Publications (2)

Publication Number Publication Date
CA2413880A1 true CA2413880A1 (en) 2003-07-02
CA2413880C CA2413880C (en) 2011-10-18

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CA2413880A Expired - Lifetime CA2413880C (en) 2002-01-02 2002-12-10 Encryption and content control in a digital broadcast system

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US (1) US7218738B2 (en)
CA (1) CA2413880C (en)

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