Conditional entitlement processing for obtaining a control word

Details Conditional entitlement processing for obtaining a control word Conditional entitlement processing for obtaining a control word

H - Electricity

04

L

H04L 9/14 (2006.01) H04L 9/28 (2006.01) H04L 9/32 (2006.01) H04N 21/2347 (2011.01)

Patent

CA 2695096

The invention provides an improved method and an improved receiver for obtaining a control word. Two or more subkeys are obtained in a receiver. Each subkey was encrypted under control of a key received in an entitlement message or transformed under control of a seed received in an entitlement message. After decryption or transformation, the subkeys are combined to obtain the control word. Typically at least one of the entitlement messages is a positive entitlement message and at least one of the entitlement messages is a negative entitlement message. The invention can be used in a conditional access system such as a Pay-TV system.

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