The present invention is concerned with inclusion of a "fragile watermark" in an original printed document to aid in a determination whether a document under examination is an original or a copy. The watermark may be applied by making small tonal adjustments on a pixel block by pixel block basis in data used to generate the original document. Documents to be verified may then be examined on a block-by-block basis after scanning.

 
Web www.patentalert.com

< Critical packet partial encryption

> System and method for delivering a greeting card to a user

~ 00476