Method and apparatus for preventing fraudulent access in a...

H - Electricity – 04 – N

Patent

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Details

H04N 7/16 (2006.01) H04L 9/32 (2006.01) H04N 7/167 (2006.01) H04H 1/00 (2006.01)

Patent

CA 2284036

A receiver/decoder is programed only to accept a current entitlement control message (EMM) if it has received at least a previous EMM of a previous calendar period. When this is received, it is used to check present rights in the receiver/decoder. The invention prevents an original subscriber from fraudulently obtaining rights by disconnecting a decoder (before an authorising message can update the decoder's memory to prevent decryption) and by reconnecting the decoder (so as to be mistaken for a new subscriber legitimately having those rights).

On programme un receveur/décodeur afin qu'il n'accepte un message courant de commande d'habilitation (EMM) que s'il a reçu au moins un EMM précédent d'une période chronologique précédente. A la réception de ce dernier, on l'utilise afin de vérifier les droits actuels dans le récepteur/décodeur. L'invention permet d'empêcher un abonné original d'obtenir des droits sans autorisation en mettant hors service le décodeur (avant qu'un message d'autorisation n'effectue la mise à jour de la mémoire du décodeur afin d'empêcher le déchiffrement) et en le remettant en service (afin qu'il puisse être utilisé par un nouvel abonné jouissant pleinement de ses droits).

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