Cryptography – Video cryptography
Reexamination Certificate
2005-09-27
2005-09-27
Coby, Frantz (Department: 2161)
Cryptography
Video cryptography
C380S278000, C380S287000
Reexamination Certificate
active
06950520
ABSTRACT:
A method and apparatus for modifying a video signal to allow it to carry encoded data which is detectable at a suitably compliant receiver but is not recorded by a conventional video recorder. One application is to carry a descrambling key to prevent useful recording (but not viewing) of a scrambled television signal since the key will not be recorded. This encoded “hidden” data is not recorded by the conventional video recorders because, for instance, it is located in the vertical or horizontal blanking intervals of the video signal, or is carried by a high frequency carrier signal, or is expressed by phase modulation of the video signal's synchronization pulses.
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Hollar Mark A.
Holzgrafe James R.
Ryan John O.
Coby Frantz
Macrovision Corporation
Morrison & Foerster / LLP
Santos Patrick
LandOfFree
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