Validity checking

  • US 6,195,587 B1
  • Filed: 04/28/1994
  • Issued: 02/27/2001
  • Est. Priority Date: 10/29/1993
  • Status: Expired due to Term
First Claim
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1. A method for checking the validity of an item of data stored for access by a first data processor of a data processing network comprising at least two interconnected data processors, the method comprising the steps of:

  • storing for access by a second data processor a plurality of definitions of forms of data indicative of invalidity of items of data;

    causing the first data processor to provide the second data processor with a copy of the item of data;

    determining, using the second data processor, whether any of the stored forms of data are present in the item of data and declaring the item of data invalid if any of the stored forms of data are present in the item of data;

    reporting to the first data processor on the validity of the item of data; and

    causing the first data processor to prevent access to the item of data if the item of data is declared as invalid.

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