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US5 patents
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US4631603ADec 23, 1986
Method and apparatus for processing a video signal so as to prohibit the making of acceptable video tape recordings thereof
MACROVISION209 citations99
US4937679AJun 26, 1990
Dual deck video recording apparatus having enhanced copy protection and method for providing enhanced copy protection to such a recording apparatus
MACROVISION65 citations96
US4695901ASep 22, 1987
Method and apparatus for removing pseudo-sync and/or agc pulses from a video signal
MACROVISION100 citations96
US4577216AMar 18, 1986
Method and apparatus for modifying the color burst to prohibit videotape recording
MACROVISION115 citations96
US4626890ADec 2, 1986
Method and apparatus for removing phase modulation from the color burst
MACROVISION49 citations92