EP0129427A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Diskette protection
Assignee: Defendisk Ltd
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Filing: 1984-06-15
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Granted: —
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Expires: 2004-06-15
Abstract
Abstract A method for prevention of unauthorized copying from information recording media, such as diskettes comprising the steps of altering (12) the information storage characteristics of the information recording media at selectable locations (30) thereon, analyzing (14) the information recording media after the alteration to provide a storable indication of the precise locations (30) of the alteration, and recording (18) 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 (30) of the alteration and instructions to user apparatus to verify the altered status of the recording media at said precise locations (30).
Inventors
- 👤 Amiram Grynberg
- 👤 Henry Klein
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 13:03
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: 19
Claim 1
Independent Claim
90 words
A method for prevention of usage of unauthorised copies of information recording media, such as diskettes comprising the steps of: altering (12) the information storage characteristics of the information recording media at selectable locations (30) thereon; analyzing (14) the information recording media after the alteration to provide a storable indication of the precise locations (30) 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 (30).
Claim 2
Independent Claim
90 words
A method for prevention of usage of unauthorised copies of information recording media, such as diskettes comprising the steps of: altering (12) the information storage characteristics of the information recording media at selectable locations (30) thereon; analyzing (14) the information recording media after the alteration to provide a storable indication of the precise locations (30) 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 (30).
Claim 3
Dependent Claim
34 words
A method according to claim 1 and also comprising the step of recording on said media instructions to user apparatus to verify the altered status of the recording media at said precise locations (30).
Claim 4
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 5
Dependent Claim
23 words
A method according to claim 2 and also comprising the step of embedding the verify instructions within the information recorded on the media.
Claim 6
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 7
Dependent Claim
31 words
A method according to claim 1 and wherein said step of alterring (12) the information storage characteristics comprises the step of applying a physical alteration (30) to the magnetic recording medium.
Claim 8
Dependent Claim
19 words
A method according to claim 6 and wherein said altering step (12) comprises the step of cutting said medium.
Claim 9
Dependent Claim
19 words
A method according to claim 6 and wherein said altering step (12) comprises the step of heating said medium.
Claim 10
Dependent Claim
21 words
A method according to claim 6 and wherein said altering step (12) comprises the step of applying radiation to said medium.
Claim 11
Dependent Claim
43 words
A method according to claim 1 and wherein said step of altering (12) the information storage characteristics comprises the step of producing a variable signature on said medium, which variable signature provides a different signal (5) output each time that it is read.
Claim 12
Dependent Claim
26 words
A method according to claim 10 and wherein said step of producing a variable signature comprises the application of a magnetic field to said selectable locations.
Claim 13
Dependent Claim
62 words
A method according to claim 10 or claim 11 and wherein said step of embedding (16) includes the step of embedding verify instructions in said program, said verify-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 14
Independent Claim
21 words
A method according to any of the preceding claims and wherein said storable indication is embedded (16) in a computer program.
Claim 15
Dependent Claim
38 words
A copying resitant recording medium comprising: a recording medium including known random locations (30) thereof having altered information storage characteristics, said recording medium bearing information which includeds a storable indication of the precise locations (30) of the alteration.
Claim 16
Dependent Claim
38 words
A copying resitant recording medium comprising: a recording medium including known random locations (30) thereof having altered information storage characteristics, said recording medium bearing information which includeds a storable indication of the precise locations (30) of the alteration.
Claim 17
Dependent Claim
39 words
- 15. -A copying resistant recording medium according to claim 14 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 (30).
Claim 18
Dependent Claim
21 words
A copying resistant magnetic recording medium according to claim 14 and wherein said altered information storage locations (30) bear physical deformations.
Claim 19
Dependent Claim
32 words
A copying resistant magnetic recording medium according to claim 14 and wherein said altered information storage locations (30) bear a variable signature (50) operative to provide different outputs upon multiple readings thereof.
References Cited (Backward Citations)
No citation records indexed.
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