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Method and apparatus to secure proprietary operation of computer equipment

  • US 4,454,594 A
  • Filed: 11/25/1981
  • Issued: 06/12/1984
  • Est. Priority Date: 11/25/1981
  • Status: Expired due to Term
First Claim
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1. In electronic apparatus which includes:

  • digital computer means which functions to produce a sequence of two or more output signal states which are at least partially determined by stored program instructions;

    connecting means attached to the computer means which functions to receive stored program instructions from a source which is physically separable from the computer means and to supply the received instructions to the computer means; and

    display means which functions to produce an audible and/or visual message and/or display in response to one or more distinct output signal states of the computer means, which states are at least partially determined by the received program instructions;

    the improvement comprising comparison means attached to the computer means, which includes recorded reference information, which functions to detect congruence between said one or more distinct output signal states of the computer means and the reference information, and which inhibits the computer means from producing at least one output signal state in the absence of said congruence.

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