Multiplex communications – Pathfinding or routing – Switching a message which includes an address header
Patent
1994-04-22
1997-04-08
Chin, Wellington
Multiplex communications
Pathfinding or routing
Switching a message which includes an address header
H04J 326
Patent
active
056195010
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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Chaney John W.
Deiss Michael S.
Hailey James E.
Tamer Gregory G.
Chin Wellington
Herrmann Eric P.
Kurdyla Ronald H.
Thomson Consumer Electronics Inc.
Tripoli Joseph S.
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