Methods and Tangible Objects Employing Machine Readable Data
AssigneeDigimarc Corporation
InventorsBruce Davis, Geoffrey Rhoads
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Abstract
The present invention relates generally to steganography and data hiding. In one implementation we provide a method including: obtaining auxiliary data; providing a mask for a photo-reactive material, the mask corresponding at least in part to the auxiliary data; and exposing the material through the mask to steganographically impart the auxiliary data in the photo-reactive material. The auxiliary data is machine-readable from the exposed material. In another implementation the material is exposed through photolithographic illumination. Of course, other implementations are described and claimed as well.
Claims20
A method comprising:
- determining an operating or performance characteristic associated with an apparatus;
- determining a numeric expression associated with the operating or performance characteristic;
- steganographically hiding the numeric expression on or in the apparatus, wherein the numeric expression is useable in determining whether the apparatus is operating or functioning as expected.
A method comprising:
- obtaining auxiliary data;
- providing a mask for a photo-reactive material, the mask corresponding at least in part to the auxiliary data;
- and
- exposing the material through the mask to steganographically impart the auxiliary data in the photo-reactive material, the auxiliary data being machine-readable from the exposed material.
A method comprising:
- obtaining information;
- curing a photo-reactive material to steganographically impart the information in the photo-reactive material, the information being machine-readable from the cured photo-reactive material.
Dependencies are inferred from the claim text.