Apparatus and method for protecting the unauthorized duplication of a signal
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United States of America Patent
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Jul 30, 2002
Grant Date -
N/A
app pub date -
Jun 9, 1998
filing date -
Jun 10, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An additional information produced by an additional information signal producing curcuit is spectrum-spread by a spectrum spreading code generated on the basis of the timing of the synchronous signal of digital video signal and is then added to the digital video signal by means of a signal adder. The digital video signal to which the spectrum spread additional information signal is added is then written into a recording medium by a signal writing device. Thereby, the additional information signal can be added to the video signal under the condition that the reproducing quality of the video signal is never deteriorated and alteration and deletion are impossible and moreover the additional information signal can be detected for use as required from the video signal.
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