Documents and methods involving multiple watermarks

Two or more digital watermarks are embedded in a document. In one implementation the digital watermarks include characteristics that are chosen so that the watermarks will be affected in different manners if the document is subsequently copied or reproduced. A detection method or mechanism reads two...

Ausführliche Beschreibung

Bibliographische Detailangaben

Hauptverfasser:	Rhoads, Geoffrey B, Gustafson, Ammon E
Format:	Patent
Sprache:	eng
Online-Zugang:	Volltext bestellen
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