Cryptography – Video cryptography – Copy protection or prevention
Reexamination Certificate
2008-04-01
2008-04-01
Barrón, Jr., Gilberto (Department: 2132)
Cryptography
Video cryptography
Copy protection or prevention
C380S203000, C380S204000, C380S224000, C380S226000
Reexamination Certificate
active
07352863
ABSTRACT:
Enhancements to a video anticopying process that causes an abnormally low amplitude video signal to be recorded on a illegal copy. The enhancement in one version include a negative going waveform that appears to the television receiver or videotape recorder to be a sync signal, thereby causing an early horizontal or vertical retrace. In another version, selected horizontal sync pulses are narrowed, causing irregular vertical retraces. In another version, post-pseudo sync pulses that have a minimum level above the minimum level of sync pulses are added to enhance anti-copy effectiveness. The post pseudo-sync pulses may be amplitude modulated.
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Barrón Jr. Gilberto
Lanier Benjamin E.
Macrovision Corporation
Morrison & Foerster / LLP
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