In accordance with a first aspect, a remote server receives video programming in a first encrypted form and stores the video programming. After the remote server receives a request from a subscriber station for transmission of the video programming, the remote server decrypts the video programming, re-encrypts...http://www.google.es/patents/US6229895?utm_source=gb-gplus-sharePatente US6229895 - Secure distribution of video on-demand
