Software protection and identification system

Details Software protection and identification system Software protection and identification system

1985-06-03

1990-12-25

Hecker, Stuart N.

Dynamic magnetic information storage or retrieval

General recording or reproducing

Recording-or erasing-prevention

360135, 364200, 411394, G11B 500, G11B 900

Patent

active

049807820

ABSTRACT:
A method of protecting machine readable signals recorded on magnetic recording media from unauthorized duplication and use. The signals to be protected are recorded on an authorized magnetic recording medium having a relatively high coercivity. An attempt is made by the computer to alter predetermined validating signals on a recording medium presented for use in the computer. The computer is disabled from further using the signals recorded on the recording medium if the validating signals cannot be read back. If the protected signals have been copied onto an unauthorized recording medium having a relatively lower coercivity and such unauthorized recording medium is presented to the computer, the validating signals will be alterable. Thus, an unauthorized copy of the protected signals cannot be used since the system detects that the validating signals have been changed and disables the system.

REFERENCES:
patent: 2881073 (1959-04-01), Maclay
patent: 3245062 (1966-04-01), Kornei
patent: 3564156 (1971-02-01), Greiner et al.
patent: 3883892 (1975-05-01), Kneller et al.
patent: 4239959 (1980-12-01), Gutterman
patent: 4313140 (1982-01-01), Keidl
patent: 4462078 (1985-07-01), Ross
patent: 4584641 (1986-04-01), Guglielmino

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