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.