Method and apparatus for adjusting decryption keys

H - Electricity – 04 – L

Patent

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Details

H04L 9/30 (2006.01) H04L 9/32 (2006.01)

Patent

CA 2685877

In a digital cinema system (100), a Secure Clock (114) can drift over time, possibly presenting the ability to playout a digital cinema presentation near the end of the validity interval of a decryption key. To accommodate for the drift in the Secure Clock, the validity interval of the decryption key is adjusted in accordance with the time difference between a secure time value and a present time value.

Dans un système de cinéma numérique (100), une horloge sécurisée (114) peut dériver au cours du temps et peut éventuellement avoir la capacité de lire une présentation de cinéma numérique à proximité de la fin de l'intervalle de validité d'une clé de décryptage. Pour s'adapter à la dérive de l'horloge sécurisée, l'intervalle de validité de la clé de décryptage est ajusté conformément à la différence de temps entre une valeur de temps sécurisée et une valeur de temps présente.

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