Cryptography – Video cryptography – Video electric signal modification
Reexamination Certificate
2006-06-13
2006-06-13
Barron, Jr., Gilberto (Department: 2132)
Cryptography
Video cryptography
Video electric signal modification
C380S240000, C380S242000, C380S212000
Reexamination Certificate
active
07062048
ABSTRACT:
A content data distribution system uses a single key and multiple program authorization to transmit a plurality of programs in multiplexed data packets such as those used in Digital Video Broadcasting. A receiver has a memory, a descrambler and a processor. Authorization indicators are transmitted among said data packets and stored in the memory. The authorization indicators identify a plurality of authorized data packets corresponding to at least one authorized program and further identifies a plurality of unauthorized data packets corresponding to at least one unauthorized program. Only authorized data packets are output from a receiver in decrypted form. Null sets are substituted for unauthorized data packets. Data packet tables may be rebuilt as necessary to replace tables lost in null set substitution. One key is used to encrypt all programs. Alternatively, a number of keys fewer than the number of authorized programs may be used for encryption. The keys may themselves be encrypted for transmission.
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Kennedy Kevin
Livaditis Elias J.
Barron Jr. Gilberto
Husch & Eppenberger LLC
Kim Jung
Wegener Communications, Inc.
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