Method for controlling access to an encrypted programme

Details Method for controlling access to an encrypted programme Method for controlling access to an encrypted programme

H - Electricity

04

N

H04N 21/6334 (2011.01) H04N 21/266 (2011.01) H04N 21/4405 (2011.01)

Patent

CA 2450186

The invention concerns a method for controlling access to an encrypted programme broadcast by an operator to a plurality of groups of subscribers, each group of subscribers being provided with a group key (KG), and each subscriber being eligible to receive from the operator an operating key (KT) encrypted by the group key (KG) for decrypting the broadcast programme. The inventive method is characterised in that it further comprises the following steps: before the encrypted programme is broadcast, (a) associating the encrypted operating key (KT) with a random value (R) to generate a secret code; (b) transmitting the secret code to the subscribers; (c) transmitting the random value (R) to the subscribers to calculate the operating key (KT) when the encrypted programme is broadcast.

L'invention concerne un procédé de contrôle d'accès à un programme crypté diffusé par un opérateur à une pluralité de groupes d'abonnés, chaque groupe d'abonnés étant muni d'une clé de groupe KG, et chaque abonné étant susceptible de recevoir de l'opérateur une clé d'exploitation KT chiffrée par la clé de groupe KG pour décrypter le programme diffusé. Le procédé selon l'invention comporte en outre les étapes suivantes: avant la diffusion du programme crypté, (a) associer la clé d'exploitation KT chiffrée à une valeur aléatoire R pour générer un code secret ;(b) transmettre le code secret aux abonnés, (b) transmettre la valeur aléatoire R aux abonnés pour calculer la clé d'exploitation KT lorsque le programme crypté est diffusé.

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