A pattern inserted into a digital image, audio or video file identifying the file's copyright information (author, rights, etc.). The name comes from the faint watermarks imprinted on stationery which identify a manufacturer of stationery. The purpose of digital watermarks is to provide copyright protection for intellectual property. Unlike print watermarks, which are supposed to be visible, digital watermarks are designed to be completely invisible.
A digital watermark is an imprint used to brand images as property of an online retailer. The imprint is removed once the image is sold. The visual content found on Hemera Image Express(tm), for instance, contains a transparent Hemera watermark, preventing the use of that image in design without sale.
embeds owner/author information into video, audio, and graphics files (p. 205)