What use is a watermark?
A watermark is used to convey indelible information about an image to the audience: this might include the name of the copyright owner, date of creation, a logo, contact details, URL and restrictions of usage. Watermarks assist in controlling the use and distribution of images; the more sophisticated systems can support the tracking of protected images across the web. A watermark however, does not prevent unauthorised use of an image, it only informs the end-user that they are using a protected image. Users can choose to ignore this warning.
