Apparatus and method for preventing unauthorized copying of video signals
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United States of America Patent
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May 23, 1995
Grant Date -
N/A
app pub date -
Jul 21, 1993
filing date -
Jul 24, 1992
priority date (Note) -
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status (Latency Note)
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Abstract
In a digital video tape recorder (VTR) which reproduces digital video and audio signals from a magnetic tape, a copy protect bit in the reproduced digital video signal is detected, and on the basis of the copy protect bit, a code is generated and inserted into the vertical blanking interval of the reproduced video signal. When a video signal (which may be in analog or digital form) having the code in the vertical blanking interval is received in a digital VTR, the code is detected and recording of the video signal and an associated audio signal is inhibited if the code indicates that the received video signal is copy protected.
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