Watermarking digital documents
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United States of America Patent
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May 29, 2012
Grant Date -
N/A
app pub date -
Sep 26, 2011
filing date -
Apr 5, 2011
priority date (Note) -
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Abstract
A watermark is embedded in a document having a plurality of pages. The pages of the document are analyzed to produce watermark information, which indicates whether the page is suitable for use with one or more of a plurality of watermarking schemes. The plurality of watermarking schemes may include page element shifting, flyspecking and text warping. An identifier (ID) is established, the ID associating the document with a user receiving the document. The ID is embedded in the pages of the document using the plurality of watermark schemes according to the watermark information. To recover an ID from a document, the pages of the document are analyzed to identify watermark information associated with the document. Embedded watermarks are recovered from the pages using the watermark information.
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