Partial encryption and PID mapping
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United States of America Patent
Stats
-
Dec 19, 2006
Issued Date -
N/A
app pub date -
Jan 2, 2002
filing date -
Jun 6, 2001
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An encryption arrangement for multiple encryption of television programs. A system according to embodiments of the present invention multiple encrypts only a portion of the data required for full presentation of a television program to permit coexistence of multiple conditional access encryption systems associated with multiple manufacturer's set-top boxes within a single system. PID mapping techniques are used to distinguish between multiple encryptions. By only encrypting a portion of the program, dramatically less bandwidth is consumed than the alternative of multiple encryption of all program data, thus permitting a larger number of programs to be carried over the same bandwidth while permitting coexistence of multiple conditional access systems in a single cable television system.
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Family
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Cited Art Landscape
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