This image by Web graphics specialist Jim O'Donnell is actually a picture within a picture.
It uses a watermarking technique developed by Digimarc, which believes it can solve international copyright issues on the Web by acting as a digital signature.
The tool has been integrated into Adobe Photoshop and Corel Draw. Now Digimarc is offering a free watermark reader for download from www.digimarc.com/.
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