Dynamic magnetic information storage or retrieval – General recording or reproducing – Recording-or erasing-prevention
Patent
1986-08-04
1989-08-15
Cardillo, Raymond F.
Dynamic magnetic information storage or retrieval
General recording or reproducing
Recording-or erasing-prevention
360131, 360135, 360137, 364300, G11B 502, G11B 509
Patent
active
048580368
ABSTRACT:
A method of protecting machine readable signals recorded on magnetic recording media from unauthorized duplication and use. The signals to be protected are recorded on a first portion of the magnetic recording media. The protected signals on the first portion can be detected and altered by the machine. Second signals are recorded on a second portion of the magnetic recording media. The second signals on the second portion can be detected by the machine but cannot be altered by the machine. An attempt is made by the machine to alter the second signals on the second portion. Then, if the second signals cannot be detected on said second portion, the machine is disabled from further using the signals recorded on the recording media. Apparatus for practicing the method is also disclosed.
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Bowler Alyssa H.
Cardillo Raymond F.
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