Method and apparatus for access control of pre-encrypted...

H - Electricity – 04 – N

Patent

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H04N 7/16 (2006.01) H04N 7/173 (2006.01)

Patent

CA 2372810

A method and apparatus for providing access control of pre-encrypted on-demand television content. Existing encryption capability for cable television services or the like is extended to handle pre-encrypted content from a server (12) that is requested on demand by a viewer at a user terminal (20). Alternatively, the pre-encrypted content (provided, e.g. by an encryption device (14) can be broadcast or multicast from the server (12) to a group of viewers. The invention is upgradeable to facilitate implementations of entitlement control algorithms that vary in sophistication as the need dictates. Additionally, the method is extensible to enable access control of pre-encrypted content that is independent of the transport protocol used. Such protocols include, for example, MPEG-2 and Internet Protocol (IP) which may also utilize Public Key Cryptography.

L'invention concerne un procédé et un appareil permettant de contrôler l'accès à un contenu télévisuel à la carte pré-crypté. La capacité de chiffrement existante au niveau des services télévisuels par câble, ou analogue, est étendue à un contenu pré-crypté à partir d'un serveur (12), demandé par un téléspectateur à un terminal d'utilisateur (20). Selon un mode de réalisation, le contenu pré-crypté (fourni, par exemple, par un dispositif de chiffrement (14)) peut être diffusé, ou multi-diffusé, à partir du serveur (12) vers un groupe de téléspectateurs. On peut faciliter des implantations d'algorithmes de contrôle d'admissibilité dont la complexité varie en fonction des besoins. En outre, on peut étendre le procédé afin de permettre un contrôle d'accès de contenu pré-crypté qui soit indépendant du protocole de transport utilisé. De tels protocoles comprennent notamment MPEG-2 et le protocole Internet (IP) qui peuvent également utiliser un cryptage à clé publique.

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