Dynamic magnetic information storage or retrieval – General recording or reproducing – Recording-or erasing-prevention
Patent
1983-09-06
1988-03-29
Hecker, Stuart N.
Dynamic magnetic information storage or retrieval
General recording or reproducing
Recording-or erasing-prevention
360133, 360135, G11B 1504, G11B 1904, G11B 509
Patent
active
047347961
ABSTRACT:
A method for prevention of unauthorized copying from information recording media, such as diskettes, comprising the steps of altering the information storage characteristics of the information recording media at selectable locations thereon, analyzing the information recording media after the alteration to provide a storable indication of the precise locations of the alteration, and recording onto the altered recording media information the copying of which is to be resisted, the information thus recorded including said storable indication of the precise locations of the alteration and instructions to user apparatus to verify the altered status of the recording media at said precise locations. A protected recording medium is also disclosed and claimed.
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patent: 4100575 (1978-07-01), Morio
patent: 4163253 (1979-07-01), Morio
patent: 4462078 (1984-07-01), Ross
patent: 4477848 (1984-10-01), McWhirter et al.
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patent: 4584641 (1986-04-01), Guglielmino
IBM-TDB--vol. 23, No. 2, 7/80, Jone et al., Apparatus for Generating Desired Physical Defects.
Grynberg Amiram
Klein Henry
Bowler Alyssa H.
Hecker Stuart N.
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