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ANNOTATION VALIDITY USING PARTIAL CHECKSUMS

  • US 20080209310A1
  • Filed: 04/30/2008
  • Published: 08/28/2008
  • Est. Priority Date: 12/04/2002
  • Status: Active Grant
First Claim
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1. A tangible computer-readable medium containing a program which, when executed by a processor, performs operations comprising:

  • receiving, from a user, a request for an annotation for one or more portions of a data object;

    calculating a current change detection value for data extracted from the one or more portions in response to receiving the request;

    comparing the current change detection value to a previous change detection value calculated for data extracted from the one or more portions prior to receiving the request; and

    if the current and previous change detection values do not match, indicating to the user that the requested annotation is invalid due to a change in the one or more portions of the data object.

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