Seamless switching between multiple pre-encrypted video files

H - Electricity – 04 – N

Patent

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Details

H04N 7/167 (2006.01) H04N 7/173 (2006.01)

Patent

CA 2487319

In a video on demand (VOD) system, methods and apparatus are provided for seamlessly switching back and forth between two pre-encrypted files having changing encryption keys. Such switching back and forth may be required when a VOD server stores both a "normal" copy of a movie and a "special" copy such as a "trick-play" version for, e.g., fast forward and rewind effects. Instead of using keys with changing parities in both streams, the special stream is encrypted with keys using the same parity (even or odd), while the normal stream is encrypted with one dynamic key (odd or even) and one fixed key (even or odd). Other special streams, such as scene branch streams and alternate angle streams can also be accommodated.

L'invention concerne un système de vidéo sur demande (VOD) dans lequel des procédés et des appareils permettent d'effectuer une commutation avant et arrière sans interruption entre deux fichiers pré-chiffrés possédant des clés de chiffrement changeantes. Une telle commutation avant et arrière peut être nécessaire quand un serveur VOD stocke aussi bien une copie "normale" d'un film qu'une copie "spéciale", telle qu'une version à "jeu de pièges" destinée à, par exemple, des effets d'avance rapide et de rebobinage. A la place d'utiliser des clés à parités changeantes dans les deux trains, le train spécial est chiffré au moyen de clés utilisant la même parité (pair ou impair), alors que le train normal est chiffré au moyen d'une clé dynamique (impair ou pair) et d'une clé fixe (pair ou impair). D'autres trains spéciaux, tels que des trains de branche de scène et des trains à angle alterne peuvent également être traités.

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