Providing control words to a receiver

Details Providing control words to a receiver Providing control words to a receiver

H - Electricity

04

N

H04N 21/2347 (2011.01) H04L 9/00 (2006.01)

Patent

CA 2724931

A method and a system for providing control words to at least one a receiver are described wherein said receiver is associated with a secure module. The method comprises the steps of receiving at least part of a code book comprising code information for descrambling one or more service streams in a scrambled data stream sent to said receiver; providing a control word request associated with at least one crypto period in at least one of said service streams; and, in response to said control word request, generating on the basis of said code information at least one control word for descrambling data in said service stream and associated with said crypto period.

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