A method is provided for applying a watermark pattern along a length of photosensitive medium, the photosensitive medium having a frame pitch in the length direction that is the sum of an image frame height plus an interframe distance. The method exposes watermark tiles contiguously along the length...http://www.google.de/patents/US7068297?utm_source=gb-gplus-sharePatent US7068297 - Watermarking method for motion picture image sequence
