A method and apparatus for providing media-independent security for a document may be programmed to create a document file having two or more components. In one embodiment, a document may include a background object, an image object (e.g. text, graphic, both, or the like), and a watermark object. When...http://www.google.com/patents/US5974548?utm_source=gb-gplus-sharePatent US5974548 - Media-independent document security method and apparatus
