System for preventing playback of unauthorized digital video recordings
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United States of America Patent
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Oct 15, 2002
Issued Date -
N/A
app pub date -
Jan 11, 2000
filing date -
May 21, 1998
priority date (Note) -
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Abstract
This invention discloses an anti-piracy system including video representation signature apparatus for computing a forbidden signature of a forbidden video representation, communication apparatus for communicating the forbidden signature to a playing device, and a playing device adapted to receive and play back a recorded video representation, the playing device including reception apparatus for receiving the forbidden signature communicated by the communication apparatus, recorded video representation signature apparatus for computing a signature of the recorded video representation, and playback control apparatus operative to prevent playback of the recorded video representation if the computed signature of the recorded video representation matches the forbidden signature communicated to the playing device
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