US4734796A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Technique for preventing unauthorized copying of information recorded on a recording medium and a protected recording medium
Assignee: Individual
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Filing: 1983-09-06
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Granted: 1988-03-29
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Expires: 2003-09-06
Abstract
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.
Inventors
- 👤 Amiram Grynberg
- 👤 Henry Klein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 01:21
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/00086; G11B20/0092; G11B20/00927; G11B20/00094; G11B20/00123; G11B20/00572; G11B20/00586; G11B23/00; G11B23/28; G06; G06F; G06F2211/00; G06F2211/007
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
168 words
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.
Claim 2
Independent Claim
168 words
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.
Claim 3
Dependent Claim
23 words
A method according to claim 1 and also comprising the step of embedding the storable indication within the information recorded on the media.
Claim 4
Dependent Claim
59 words
A method according to claim 2 and wherein said step of embedding includes the step of embedding verify instructions in said program, said verifying instructions including instructions to read said selectable locations a plurality of times, compare the outputs produced in response to said readings and to enable operation of the program only if variations exist in said outputs.
Claim 5
Dependent Claim
25 words
A method according to claim 1 and wherein each of said information bearing media has a different altered signature, which may be randomly applied thereto.
Claim 6
Dependent Claim
47 words
A method according to claim 1 and wherein said step of producing a variable signature comprises the application of a magnetic field to said selectable locations. outputs produced in response to said readings and to enable operation of the program only if variations exist in said outputs.
Claim 7
Dependent Claim
17 words
A method according to claim 1 and wherein said storable indication is embedded in a computer program.
Claim 8
Dependent Claim
113 words
A copying resistant recording medium comprising: 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.
Claim 9
Dependent Claim
113 words
A copying resistant recording medium comprising: 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.
Claim 10
Dependent Claim
36 words
A copying resistant recording medium according to claim 7 and wherein said recording medium also bears information which includes instructions to user apparatus to verify the altered status of the recording media at said precise locations.
References Cited (Backward Citations)
US3781835A
Cited
US4040099A
Cited
GB1529939A
Cited
US4100575A
Cited
US4163253A
Cited
US4477848A
Cited
US4462078A
Cited
US4584641A
Cited
US4577289A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-03-29 | 1991-09-28 | 1992-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-29 | 1995-09-28 | 1996-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-29 | 1999-09-28 | 2000-03-29 | $7700.00 | Window Closed / Lapsed |