Systems and methods are provided through which marks are generated for combination with a host image, in which source or user information is encoded into the mark either as a visually perceptibly unobtrusive pattern, or encoded by an arrangement of visually perceptible marks. Systems and methods are...http://www.google.com.au/patents/US20060115112?utm_source=gb-gplus-sharePatent US20060115112 - System and method for marking data and document distribution
