Patent ID: 7778437
Filing Date: 2010-08-17
Classification: B29C,B41J,B41M,B42D,D21H,G03G,G06K,G06Q,G06T,G07C,G07D,G07F,G10L,G11B,H04B,H04N,Y10S,Y10T

Abstract:
1. A substrate useful in forming a printed object, characterized in that the substrate has been marked to encode a steganographic digital watermark pattern thereon that conveys plural bits of digital information, said marking not being apparent to a human observer of the printed object, said steganographic pattern being detectable by visible-light scanning of the printed object to yield data from which the plural bits of digital information can be recovered, wherein said plural bits of digital information correspond to the digital watermark pattern in accordance with an algorithmic transformation, and the marking comprises a speckling of ink dots.