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Apparatus and method for serializing and validating copies of computer software

  • US 5,287,408 A
  • Filed: 08/31/1992
  • Issued: 02/15/1994
  • Est. Priority Date: 08/31/1992
  • Status: Expired due to Term
First Claim
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1. A method of disabling an unauthorized copy of a computer program comprising the steps of:

  • defining a set of numbers which are generated according to a first mathematical function and which can be validated by a second mathematical function;

    specifying a location of said computer program wherein one number of said set of numbers is written to said location in an authorized copy of said computer program;

    reading a number from a copy of said computer program at said location;

    determining whether said read number is valid according to said second mathematical function;

    disabling said copy if said read number is not valid.

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