Cryptography – Video cryptography – Video electric signal modification
Reexamination Certificate
2007-05-29
2007-05-29
Sheikh, Ayaz (Department: 2131)
Cryptography
Video cryptography
Video electric signal modification
C713S189000, C713S193000, C713S194000, C380S200000, C380S201000, C380S202000, C380S210000, C380S211000, C380S212000, C380S213000, C382S232000
Reexamination Certificate
active
10629839
ABSTRACT:
The present invention is directed towards providing a partial dual-encrypted stream in a conditional access overlay system. The headend equipment includes an aligner, identifier, and remapper (AIR) device (615) that receives a clear stream and one or two encrypted streams, where the two encrypted streams have been encrypted by two different encryption schemes. The AIR device (615) identifies critical packets associated with the clear stream and subsequently allows two encrypted streams to pass and drops the critical packets of the clear stream. A multiplexer (640) then combines a percentage of the non-critical packets of the clear stream and the critical packets of the two encrypted streams to provide the partial dual-encrypted stream.
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Evans Jonathan Bradford
Pinder Howard G.
Wasilewski Anthony J.
Woodward, Jr. William D.
Chai Longbit
Scientific-Atlanta, Inc.
Sheikh Ayaz
LandOfFree
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