Selective encryption to enable multiple decryption keys

Details Selective encryption to enable multiple decryption keys Selective encryption to enable multiple decryption keys

H - Electricity

04

N

H04N 21/2347 (2011.01) H04N 21/435 (2011.01)

Patent

CA 2437018

A selective encryption method and apparatus consistent with the invention duplicates selected packets in a file or data stream and multiple encrypts the packets using multiple encryption keys. Each encryption key is valid for a specific segment of time so that changes in entitlement keys used for decryption can be made without negatively impacting a customer's ability to access content that has been paid for.

Dispositif et méthode de chiffrement sélectif correspondant à l'invention, qui reproduit des paquets de données sélectionnés dans un fichier ou un flux de données et exécute un chiffrement multiple des paquets au moyen de clés de chiffrement multiples. Chaque clé est valide pour une période de temps particulière, ce qui permet des modifications des clés d'admissibilité servant du déchiffrement, sans avoir d'effets négatifs sur la capacité d'un client à accéder au contenu pour lequel il a payé.

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