Multiplex communications – Communication techniques for information carried in plural... – Byte assembly and formatting
Patent
1996-10-08
1998-09-01
Chin, Wellington
Multiplex communications
Communication techniques for information carried in plural...
Byte assembly and formatting
348 55, 348469, 348473, 348426, 380 10, 380 23, 380 42, H04K 100
Patent
active
058020632
ABSTRACT:
Apparatus in a receiver, for processing transmitted entitlement control information, 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 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 is the processor permitted to process the entitlement data. The entitlement data is thereafter utilized to generate decryption keys for descrambling portions of the transmitted signal.
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Chin Wellington
Herrmann Eric P.
Kurdyla Ronald H.
Thomson Consumer Electronics Inc.
Tripoli Jopseph S.
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