Critical packet partial encryption
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United States of America Patent
Stats
-
Feb 26, 2008
Grant Date -
Feb 6, 2003
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. In one embodiment, only critical packets such as those carrying a payload incorporating packetized elementary stream header information is encrypted. 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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