A system and method is described for providing an encoding scheme for a bit stream and displaying or printing the encoded bit stream. Using the encoded bit stream, a pen with a camera may capture an image of a portion of the encoded bit stream. The captured image may then be decoded to provide an indication...http://www.google.com/patents/US20070104372?utm_source=gb-gplus-sharePatent US20070104372 - ACTIVE EMBEDDED INTERACTION CODING
