Method and apparatus for modifying a video signal to inhibit unauthorized videotape recording and subsequent reproduction thereof
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United States of America Patent
Stats
-
Oct 5, 1993
Grant Date -
N/A
app pub date -
Jun 21, 1991
filing date -
Jun 21, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method and an apparatus which modifies a video signal such that a conventional video monitor reproduces a normal picture from the modified video signal, whereas a videotape recording of the modified video signal and subsequent playback thereof produces disturbances in the displayed picture. Predetermined portions of the video signal are identified and copy protection signals are added thereto. The signal mixing and delaying characteristics of a videotape recorder comb filter are exploited to modify, produce and relocate synchronization and burst interfering copy protection signals added to an original videotape recording.
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