Copy protection circuit for a data in a memory

Details Copy protection circuit for a data in a memory Copy protection circuit for a data in a memory

1997-11-07

1998-11-17

Beausoliel, Jr., Robert W.

Cryptography

Key management

Having particular key generator

395186, 39518701, 39518801, 39520059, 380 3, 380 4, 380 23, G06F 1100

Patent

active

058389024

ABSTRACT:
An improved copy protection circuit of a data stored in a memory capable of advantageously protecting an illegal copying of a data stored in a memory such as a mask ROM (Read Only Memory) by storing a data in a security data store cell. The protection circuit includes a security data store circuit for storing a security data encoded in accordance with a chip enabling signal applied thereto, a switch circuit for outputting a switching signal controlled by the security data, and a data converting circuit for converting an input address by receiving the input address and the security data and for outputting the converted address or the input address to a X, Y-address buffer/decoder in accordance with an output of the switch circuit.

REFERENCES:
patent: 5446864 (1995-08-01), Burghardt et al.
patent: 5499295 (1996-03-01), Cooper

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