CONDITIONAL ACCESS INFORMATION ARRANGEMENT

摘要

PROBLEM TO BE SOLVED: To provide an apparatus whereby entitlement data are layered to provide denial of entitlements to receive program material on short notice.

SOLUTION: The apparatus includes a packet transport processor for selecting signal packets having payloads containing a conditional access payload header and a remaining payload of entitlement data. Respective payload headers include groups of bytes which are coded in a manner to allow or disallow the respective receiver to process the entitlement data. A conditional access filter preprogrammed with a subscriber specific conditional access codeword examines respective byte groupings of the conditional access header for a match with the subscriber specific conditional access codeword. Only if a match occurs, the processor is permitted to process the entitlement data. The entitlement data are thereafter utilized to generate decryption keys for decrypting portions of the transmitted signal.

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