Implementing a shared higher level of privilege on personal comp

Details Implementing a shared higher level of privilege on personal comp Implementing a shared higher level of privilege on personal comp

1986-11-12

1990-02-20

Heckler, Thomas M.

Cryptography

Cryptanalysis

364969, 3649692, 3649694, H04L 900

Patent

active

049032968

ABSTRACT:
Method and apparatus which restricts software, distributed on magnetic media, to use on a single computing machine. The original medium is functionally uncopyable, until it is modified by the execution of a program stored in a tamper proof co-processor which forms a part of the computing machine. The modified software on the original medium may then be copied, but the copy is operable only on the computing machine containing the co-processor that performed the modification.

REFERENCES:
patent: 4168396 (1979-09-01), Best
patent: 4246638 (1981-01-01), Thomas
patent: 4465901 (1984-08-01), Best
patent: 4558176 (1985-12-01), Arnold et al.
patent: 4573119 (1986-02-01), Westheimer et al.
patent: 4577289 (1986-03-01), Comerford et al.

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