Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Patent Inventor Names
Friedrich Toensing0
Joerg Schwenk0
Date of Patent
June 30, 2009
Patent Application Number
09807235
Date Filed
September 23, 1999
Patent Primary Examiner
Patent abstract
Verification of true authorship on the basis of digital watermarks is described. The digital watermark can be provided with the proof of identity id and/or with the hash value h(m) of the document and/or with a time value t.
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