Method and device for preventing tape piracy

Details Method and device for preventing tape piracy Method and device for preventing tape piracy

1987-06-01

1989-01-31

Buczinski, Stephen C.

Cryptography

Cryptanalysis

360 60, 380 6, G11B 1504, H04L 900

Patent

active

048022128

ABSTRACT:
A device is disclosed to prevent the unauthorized copying of magnetic tapes (tape "piracy"). The device utilizes an inaudible signal encoded into the tape program as the master recording is being made. A separate decoding circuit is to be installed in commercially available stereo tape decks. Whenever the encoded signal is present on the original recording, the decoding circuitry will short the bias signal of the tape deck being used to attempt to make the copies. This will prevent the deck from recording any of the program on the original tape.

REFERENCES:
patent: 3936594 (1976-02-01), Schubin
patent: 3963865 (1976-06-01), Songer
patent: 4100575 (1978-07-01), Morio et al.
patent: 4163253 (1979-07-01), Morio et al.
patent: 4603349 (1986-07-01), Robbins

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