Method and apparatus for the protection of signal copy

Details Method and apparatus for the protection of signal copy Method and apparatus for the protection of signal copy

1990-06-13

1991-12-17

Gregory, Bernarr E.

Cryptography

Cryptanalysis

380 4, 380 23, 360 60, G11B 2336, G11B 15087

Patent

active

050739255

ABSTRACT:
An apparatus for the protection of signal copy for preventing 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.

REFERENCES:
patent: 4005428 (1977-01-01), Graham
patent: 4086634 (1978-04-01), Cook
patent: 4488183 (1984-12-01), Kinjo
patent: 4577216 (1986-03-01), Ryan
patent: 4945563 (1990-07-01), Horton et al.
Patent Abstract of Japan, vol. 9, No. 116 (p. 357) (1839), May 21, 1985 & JP-A-60 1660 (Mitsubishi Denki K.K.) 7-1-85.
Patent Abstracts of Japan, vol. 10, No. 312 (P-509) (2368) Oct. 23, 1986 and JP-A-61-123026 (Matsushita Electric Ind. Co., Ltd.) 10-6-86.

Affiliated with

Also associated with

Rating

Method and apparatus for the protection of signal copy does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and apparatus for the protection of signal copy, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for the protection of signal copy will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-839380