Cryptography – Video cryptography – Video electric signal modification
Reexamination Certificate
2003-08-21
2009-02-03
Moazzami, Nasser G (Department: 2136)
Cryptography
Video cryptography
Video electric signal modification
C380S281000, C380S043000
Reexamination Certificate
active
07486792
ABSTRACT:
According to the invention, a method for protecting digital television from unauthorized digital receivers within a population of digital receivers is disclosed. Each digital receiver in the population has a unique identifier. In one step, provisioning information is received from a subset of the population of digital receivers indicating that the subset is potentially within range to receive digital television from a broadcaster. First decryption information is distributed to the subset of the population of digital receivers. The first decryption information allows for potentially decrypting a plurality of programs coextensively in time. The unauthorized digital receivers are cryptographically excluded from using the first decryption information. A first program is encrypted using a first method that is cryptographically related to second decryption information. The first program is sent. The second decryption information is distributed and cryptographically secured with the first decryption information.
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Cullen Larry T.
General Instrument Corporation
Moazzami Nasser G
Reza Mohammad W
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