Dynamic magnetic information storage or retrieval – Recording or reproducing an information signal and a control...
Patent
1993-04-13
1995-02-28
Shepperd, John
Dynamic magnetic information storage or retrieval
Recording or reproducing an information signal and a control...
360 60, 380 3, G11B 502, G11B 1504, G11B 1904, G11B 2328
Patent
active
053942744
ABSTRACT:
A system for preventing the unauthorized copying of audio or video recording by (1) processing the recorded material so as to identify the protected material in a manner that does not audibly distort the program material, and (2) processing the recorded material by a second method that produces audible artifacts. Equipment capable of removing the audible artifacts while retaining the inaudible identification signal would be installed in audio digital tape recorders or video recorders so as to allow the equipment to be used for playback purposes while at the same time discouraging the unauthorized copying of audio, video or motion picture protected material.
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Shepperd John
Wamsley Patrick
LandOfFree
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