Software protection apparatus and the method of protection utili

Details Software protection apparatus and the method of protection utili Software protection apparatus and the method of protection utili

1996-03-27

1998-05-19

Buczinski, Stephen C.

Cryptography

Cryptanalysis

3642866, 395479, 395490, H04L 900, H04B 320, G06F 1214

Patent

active

057546479

ABSTRACT:
An apparatus and method for software protection utilizing a read-write memory device having output data that is inconsistent with the corresponding input data. An emulator detector monitors address inputs to the memory device and detects suspect addressing that indicates an unauthorized memory access is taking place. Upon detection of suspect addressing, the emulator detector switches the memory into a mode in which the memory generates erroneous data, either continuously or intermittently. In addition, the emulator detector can drive a system bus, such as an address bus, a data bus, or a control bus, to a high or low state, either continuously or intermittently, causing an erroneous data read or failure of the emulator system.

REFERENCES:
patent: 4525599 (1985-06-01), Curran et al.
patent: 5513337 (1996-04-01), Gillespie et al.
patent: 5535275 (1996-07-01), Sugisaki et al.
patent: 5574787 (1996-11-01), Ryan

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