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PRODUCT HAVING ENCODED AUTHENTICATION WRITING AREAS

  • US 20080314653A1
  • Filed: 07/24/2007
  • Published: 12/25/2008
  • Est. Priority Date: 05/25/1999
  • Status: Active Grant
First Claim
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1. A product comprising a plurality of coded tags and at least one authentication writing area defined by at least some of the coded tags for receiving handwritten authentication information from a sensing device operated by a user, each coded tag encoding coordinates for a point on a tag map and an orientation feature, each orientation feature enabling the sensing device to determine a planar orientation of each tag relative to a yaw of the sensing device.

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