This information, when decoded with the appropriate software, can reveal things such as the author's address, terms of use, copyright date, etc.
Watermarks are unremovable and unalterable.
The information does not degrade with file duplication and does not perceptively disrupt the original data file. For more information regarding digital watermarks, see the articles section. Image Protection SafeImage Uses Java technology to prevent image theft on your Web site. Giovanni Offers both image and audio watermarking technology combining a secure key architecture with an embedded signalling algorithm. Digmarc Digital watermarking software and plugins for document verfication, copyright protection, embedded messages and more.