Cryptography – Video cryptography – Copy protection or prevention
Reexamination Certificate
2006-08-01
2006-08-01
Barrón, Jr., Gilberto (Department: 2132)
Cryptography
Video cryptography
Copy protection or prevention
C380S221000
Reexamination Certificate
active
07085380
ABSTRACT:
An enhancement is provided for a copy protection method that discourages copying (e.g., by video taping) of video signals. The enhancement adds negative amplitude pulses to the video signal at a location in the horizontal blanking interval “back porch” after the color burst. This enhances jitter when the copy protected signal is recorded on a VCR (video cassette recorder) and the recording is replayed, thereby making the recorded signal not suitable for viewing.
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Barrón Jr. Gilberto
Lanier Benjamin E.
Macrovision Corporation
Morrison & Foerster / LLP
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