Controlling the validity period of a decryption key

Details Controlling the validity period of a decryption key Controlling the validity period of a decryption key

H - Electricity

04

H

H04H 60/15 (2009.01) H04H 60/23 (2009.01)

Patent

CA 2706116

The invention provides a method and a system for allowing access to a digital broadcast stream on a client device in a conditional access system, wherein the start time and end time of events in the broadcast stream are predefined. If entitled, a server system transmits for an even the start time and end time to the client device. As long as the current time, which is also transmitted from the server system to the client device, is within the range from the start time to the end time, the client device is allowed to decrypt the broadcast stream. To allow events to extend in time without requiring the generation of a new end time, the start time and end time on the one hand and the current time on the other hand are defined on different timescales.

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