Identifying and requesting data in network using identifiers which are based on contents of data

  • US 20020052884A1
  • Filed: 11/15/2001
  • Published: 05/02/2002
  • Est. Priority Date: 04/11/1995
  • Status: Active Grant
First Claim
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1. In a data processing system, an apparatus comprising:

  • identity means for determining, for any of a plurality of data items in the system, a substantially unique identifier, said identifier depending on all of the data in the data item and only on the data in the data item; and

    existence means for determining whether a particular data item is present in the system, by examining the identifiers of the plurality of data items.

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