A data storage medium such as an optical disc with separate image and data tracks, and a method and apparatus for forming the same. The medium has a user data storage area with a data track to store user data, and a non-user data image track to store human readable information to form a watermark interspersed...http://www.google.de/patents/US8089852?utm_source=gb-gplus-sharePatent US8089852 - Storage medium with separate image and data tracks
