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Document copy authentication

  • US 5,157,726 A
  • Filed: 12/19/1991
  • Issued: 10/20/1992
  • Est. Priority Date: 12/19/1991
  • Status: Expired due to Term
First Claim
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1. A process for making an authenticatable copy of an original document supplied by an entity, comprising:

  • (a) making a hard copy of the original document and incorporating on the document a digital signature representing the document contents and the identity of the said entity.

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  • 4 Assignments
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