A method and apparatus for detecting copy protection included in an input
video signal is described. Two types of copy protection are particularly
addressed, including techniques that imbed copy protection pulses and
copy protection phase flips in the video signal. A method for preserving
copy protection is also presented, where the input video signal is first
examined to determine if copy protection has been included in the input
video signal. The input video signal then converted to component video
data, which removes any copy protection present. An output video signal
is then generated from the component video data, and when it was
determined that the input video signal includes copy protection, the copy
protection is recreated in the output video signal.
