METHOD FOR PROCESSING PACKETIZED TRANSPORT STREAM

摘要

PROBLEM TO BE SOLVED: To provide a system in which entitlement data are layered to provide denial of entitlements to receive program material readily.

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 a receiver from processing 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 descrambling portions of the transmitted signal.

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