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Watermark systems and methods

  • US 8,750,556 B2
  • Filed: 10/10/2006
  • Issued: 06/10/2014
  • Est. Priority Date: 12/21/2000
  • Status: Active Grant
First Claim
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1. A method comprising:

  • sensing, by a camera-equipped system, a pattern displayed on a screen of a portable device, wherein the pattern is derived based on an identification number associated with the portable device;

    generating output data corresponding to the pattern;

    decoding plural-bit information from the output data; and

    accessing a network account associated with a user of the portable device based at least in part on the decoded plural-bit information.

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