| http://www.w3.org/ns/prov#value | - .A.Currency paper, especially bank note, with a safety design and process for producing itUS509314712 Sep 19903 Mar 1992Battelle Memorial InstituteInvisible, Infrared RadiationUS52912435 Feb 19931 Mar 1994Xerox CorporationSystem for electronically printing plural-color tamper-resistant documentsUS531509827 Dec 199024 May 1994Xerox CorporationMethods and means for embedding machine readable digital
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