Technique for preventing unauthorized copying of information recorded on a recording medium and a protected recording medium
First Claim
1. A method for prevention of usage of unauthorized copies of information recording media, such as diskettes, comprising the steps of:
- producing a variable signature on the information recording medium, which variable signature provides a different signal output upon multiple readings;
analyzing the information recording media after producing the variable signature to provide a storable indication of the precise locations of the variable signature;
recording onto the signature bearing recording media information the copying of which is to be resisted, the information thus recorded including said storable indication of the precise location of the variable signature; and
embedding onto the signature bearing recording medium instructions requiring;
reading the information recording medium at the location of the variable signature a plurality of times;
comparing the read signatures obtained upon said plurality of readings to determine whether variation is present therebetween; and
providing an output indication permitting usage of information stored on said information recording medium only in response to sensed variation in the read signatures upon said plurality of readings.
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Accused Products
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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Citations
8 Claims
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1. A method for prevention of usage of unauthorized copies of information recording media, such as diskettes, comprising the steps of:
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producing a variable signature on the information recording medium, which variable signature provides a different signal output upon multiple readings; analyzing the information recording media after producing the variable signature to provide a storable indication of the precise locations of the variable signature; recording onto the signature bearing recording media information the copying of which is to be resisted, the information thus recorded including said storable indication of the precise location of the variable signature; and embedding onto the signature bearing recording medium instructions requiring; reading the information recording medium at the location of the variable signature a plurality of times; comparing the read signatures obtained upon said plurality of readings to determine whether variation is present therebetween; and providing an output indication permitting usage of information stored on said information recording medium only in response to sensed variation in the read signatures upon said plurality of readings. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A copying resistant recording medium comprising:
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a recording medium including at least one known random location thereof, a variable signature operative to provide different outputs upon multiple readings thereof, said recording medium bearing information which includes a storable indication of the precise location of the variable signature and instructions requiring; reading the information recording medium at the location of the variable signature a plurality of times; comparing the read signatures obtained upon said plurality of readings to determined whether variation is present therebetween; and providing an output indication permitting usage of information stored on said information recording medium only in response to sensed variation in the read signatures upon said plurality of readings. - View Dependent Claims (8)
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Specification