Assignee

SPRINGMANN EDWARD

DE·1 granted patent·7 citations·filing 2008–2008

Technology mixB41M1 B42D1 G07D1

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0181US8478080B2Securing of documents by means of digital watermark informationSPRINGMANN EDWARD·Filed 2008·Granted Jul 2, 2013·7 cites·17 claims

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