05822436 is referenced by 351 patents and cites 268 patents.

Technology is now available permitting consumers to make amateur-or even professional-grade copies of photographs. For wedding and portrait photographers, in particular, the business of making duplications is fundamental to their livelihoods. The threat of such copying is felt strongly. To redress these concerns, a machine-readable marking is provided on emulsion films, photographic papers, and the like. The marking encodes digital information, yet is essentially imperceptible to the human eye. A photographic duplication kiosk can be constructed to read this embedded information and, if warranted by the embedded information, to disable the kiosk's copying function. An exemplary embodiment pre-exposes the photographic product with a spatial domain representation of the embedded data, and may include rotationally symmetric one-or two-dimensional patterns. Numerous other implementations are similarly practical.

Title
Photographic products and methods employing embedded information
Application Number
8/637531
Publication Number
5822436
Application Date
April 25, 1996
Publication Date
October 13, 1998
Inventor
Geoffrey B Rhoads
West Linn
OR, US
Agent
Klarquist Sparkman Campbell Leigh & Whinston
Assignee
Digimarc Corporation
OR, US
IPC
H04L 9/00
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