06681028 is referenced by 174 patents and cites 24 patents.

Digital data is steganographically encoded in printed materials, and—when sensed by an appropriately-equipped webcam or other imaging device—can be used to link to associated electronic resources. Data hidden in a business card, for example, may enable linking to a person's electronic calendar—showing the person's schedule availability. Likewise, data hidden in a corporate ID badge may serve to unlock doors at a corporate office, or to enable access to corporate computers. Many other such applications are detailed.

Title
Paper-based control of computer systems
Application Number
9/314648
Publication Number
6681028 (B2)
Application Date
May 19, 1999
Publication Date
January 20, 2004
Inventor
Geoffrey B Rhoads
West Linn
OR, US
Jonathan Scott Carr
Beaverton
OR, US
Tony F Rodriguez
Portland
OR, US
Agent
Digimarc Corporation
US
Agent
William Y Conwell
US
Assignee
Digimarc Corporation
OR, US
IPC
G06K 9/00
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