Semiconductor integrated circuit device with copy-preventive fun

Details Semiconductor integrated circuit device with copy-preventive fun Semiconductor integrated circuit device with copy-preventive fun

1995-07-31

1998-07-14

Popek, Joseph A.

Cryptography

Cryptanalysis

711163, G11B 2328

Patent

active

057816271

ABSTRACT:
A semiconductor integrated circuit device with a copy-preventive function comprises a memory for storing data to be used by users, an input unit for performing various logical operations on at least one input information fed externally and accessing the memory, an output unit for performing various logical operations on the data at the time of supplying the data from the memory, a judging unit for comparing at least one of the state of the input information, the logical state of the input unit, the logical state of the output unit, and the state of data provided by the output unit with specific judgment information and indicating the result of comparison, and a control unit that when the result indicated by the judging unit reveals that the at least one of the states is consistent with a specific state, acts at least on the output unit so as to prevent data stored in the memory from being supplied normally. Due to this configuration, a copy-preventive function can be reformed frequently from both the aspects of software and hardware. Consequently, illegal copying of data can be substantially disabled.

REFERENCES:
patent: 5056009 (1991-10-01), Mizuta
patent: 5073925 (1991-12-01), Nagata et al.
patent: 5131091 (1992-07-01), Mizuta
patent: 5357467 (1994-10-01), Hayashi
patent: 5406519 (1995-04-01), Ha
patent: 5559993 (1996-09-01), Elliot et al.
"Semiconductor Memories", Betty Prince, 1992, pp. 118-122.

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