Partial dual encrypted stream utilizing program map tables
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United States of America Patent
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Feb 24, 2009
Grant Date -
Oct 19, 2006
app pub date -
Dec 6, 2005
filing date -
Apr 3, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention is suitable for use in a partial dual encrypted system. The present invention allows for two different decryption devices (e.g., an incumbent, or first, set-top and an overlay, or second, set-top) to be located in a single system having an incumbent encryption scheme and a second encryption scheme. Each set-top is designed to decrypt the first or second proprietary encryption schemes, respectively. In accordance with the present invention, the second set-top utilizes a novel program map table to ensure that the second set-top chooses correct elementary streams in the partial dual-encrypted stream (i.e., a combined stream including a first encrypted stream, a second encrypted stream, and a clear stream) for a desired program.
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