Cryptography – Video cryptography – Video electric signal modification
Reexamination Certificate
2005-12-06
2009-02-24
Chai, Longbit (Department: 2131)
Cryptography
Video cryptography
Video electric signal modification
C380S200000, C380S201000, C380S202000, C380S203000, C713S189000, C713S190000, C713S191000, C713S192000, C713S193000, C382S232000
Reexamination Certificate
active
07496198
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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Evans Jonathan Bradford
Pinder Howard
Wasilewski Anthony J.
Woodward, Jr. William D.
Chai Longbit
Cisco Technology Inc.
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