Technique for preventing unauthorized copying of information recorded on a recording medium and a protected recording medium
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United States of America Patent
Stats
-
Mar 29, 1988
Grant Date -
N/A
app pub date -
Sep 6, 1983
filing date -
Apr 14, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
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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