Trick play of encrypted data in a conditional access signal
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United States of America Patent
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Issued Date -
Sep 15, 2005
app pub date -
Dec 7, 2004
filing date -
Jun 12, 2002
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
An incoming data stream contains a stream of encrypted data and a stream of messages. Data in successive segments of the stream of encrypted data is decryptable with successive decryption information from the messages. The stream of encrypted data is stored and items with decryption information from the stream of messages are stored. Synchronization information is stored that links respective points in the stored stream of encrypted data to respective ones of the items with decryption information. The synchronization is stored so that it is retrievable independent of the stream. During trick replay a stored part of the stream of encrypted data is replayed in an abnormal temporal pattern. The items with decryption information are retrieved for the points in said stored part during said replaying. The retrieved items are combined with decryption information of the stream during replay at times selected under control of the synchronization information, the items which are combined being selected and/or a time when the items are combined with the stream being selected, dependent on the synchronization information and the abnormal temporal pattern.
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