Method and apparatus for protection of signal copy
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United States of America Patent
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-
Dec 18, 1990
Grant Date -
N/A
app pub date -
Jul 8, 1988
filing date -
Jul 8, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An apparatus for the protection of signal copy for prevention unauthorized copying of music software such as records, compact discs and music tape by recording is arranged such that when recording audio signals on a medium, certain supplemental information is added to the audio signal to be recorded, and in the process of copying by reproducing this medium, when the supplemental signal is detected in the reproduced signal, the copying action is stopped to protect it from being copied.
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