Conditional access and copy protection scheme for MPEG encoded video data
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United States of America Patent
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Feb 26, 2002
Grant Date -
N/A
app pub date -
Oct 6, 1998
filing date -
Oct 6, 1998
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A method and apparatus are provided for restricting access to a digital video signal. According to the method, the digital video signal is encoded to produce an encoded video signal. In encoding the digital video signal, motion compensated encoding is performed on one or more first video picture portions of the digital video signal using a second video picture portion of the video signal as a reference for forming predictions. Only the second video picture portion of the encoded video signal is scrambled thereby producing a restricted access signal that is subsequently stored on a storage medium. Also provided is a method and apparatus for enabling access to a video signal. According to the method, the encoded video signal is received and only a first video picture portion of the video signal is descrambled. The encoded video signal is then decoded. In decoding the encoded video signal, motion compensated decoding is performed on one or more second video picture portions of the video signal using predictions formed from the descrambled first video picture portion thereby providing a decoded accessed signal.
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