Methods and apparatus for secure and adaptive delivery of...

Details Methods and apparatus for secure and adaptive delivery of... Methods and apparatus for secure and adaptive delivery of...

H - Electricity

04

L

H04L 9/00 (2006.01) H04H 60/23 (2008.01) H04L 9/28 (2006.01)

Patent

CA 2522046

Techniques for securely and adaptively delivering multimedia content. It is assumed that a set of alternate access units for each time slot is obtained. Then, the encryption stream index of each access unit from the set of alternate access units of the previous time slot are obtained. An encryption stream index is then assigned to each access unit in the set of alternate access units in the current time slot, such that the encryption index increases over time. Thus, the invention overcomes the problem of encrypting a multimedia stream that may have multiple access units for each time slot by selecting the encryption index for each access unit such that the encryption index increases, regardless of which access unit the delivery system (e.g., server) selects for transmission.

L'invention concerne des techniques d'administration sûre et adaptative d'un contenu multimédia. On obtient un ensemble d'unités à accès alterné pour chaque créneau temporel. Par la suite, on obtient l'index de flot de cryptage de chaque unité à partir de l'ensemble d'unités du créneau temporel précédent. Un index de flot de cryptage est ensuite attribué à chaque unité dans l'ensemble d'unités dans le créneau temporel actuel de manière à ce qu'il diminue dans le temps. Ainsi, l'invention résout le problème lié au cryptage d'un flot multimédia ayant de multiples unités d'accès pour chaque créneau temporel par la sélection de l'index de cryptage pour chaque unité de manière qu'il augmente, indépendamment de l'unité sélectionnée par le système d'administration (p.ex. serveur) en vue de sa transmission.

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