Partial encryption and PID mapping
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United States of America Patent
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-
Dec 18, 2007
Grant Date -
Jul 13, 2006
app pub date -
Nov 18, 2005
filing date -
Jun 6, 2001
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A method consistent with certain embodiments carried out at a television provider headend involves receiving a feed of scrambled television content in the form of a stream of packets; descrambling the scrambled television content to produce a stream of clear packets; selecting a packet for multiple encryption; duplicating the packet to provide first and second packets; re-mapping the first and second packets to first and second packet identifiers; encrypting the first packet under a first encryption algorithm to produce a first encrypted packet; encrypting the second packet under a second encryption algorithm to produce a second encrypted packet; and re-mapping clear packets to the first packet identifier. This abstract is not to be considered limiting, since other embodiments may deviate from the features described in this abstract.
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