Interactive video distribution systems – Access control or blocking – With encryption or scrambling of video signal
Reexamination Certificate
2004-02-12
2009-06-23
Koenig, Andrew Y (Department: 2423)
Interactive video distribution systems
Access control or blocking
With encryption or scrambling of video signal
C380S210000
Reexamination Certificate
active
07552457
ABSTRACT:
A method of controlling descrambling of a plurality of program transport streams received by a receiver system comprises receiving a sequence of messages in a conditional access sub-system (9,10) comprised in said receiver system, each message being associated with one of a number of scrambled program transport streams and representing a request for returning information enabling the associated scrambled transport stream to be descrambled by at least one descrambler module (12) in the receiver system, determining whether messages received within a certain interval are associated with a number of different scrambled program transport streams, and denying at least one of the requests represented by the messages received in the certain interval, if the number of different scrambled program transport streams with which the messages are associated exceeds a pre-determined number.
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Van De Ven Antonius Johannes Petrus Maria
Wajs Andrew Augustine
Featherstone Mark D
Irdeto Access B.V.
Koenig Andrew Y
Schwegman Lundberg & Woessner, P.A.
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