Cryptography – Cryptanalysis
Patent
1988-07-08
1990-12-18
Buczinski, Stephen C.
Cryptography
Cryptanalysis
380 4, 380 23, 360 60, G11B 1505
Patent
active
049792105
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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Nagata Atsushi
Senoo Takanori
Takahashi Ken'ichi
Uekawa Yutaka
Buczinski Stephen C.
Gregory Bernarr Earl
Matsushita Electric - Industrial Co., Ltd.
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