Linking documents through digital watermarking
First Claim
1. A method of linking a first document to at least a second document, the first document comprising a first digital watermark including a first identifier, said method comprising:
- decoding the first digital watermark to obtain the first identifier;
providing a second identifier, wherein the second identifier is based on the first identifier, and embedding in the second document a second digital watermark including the second identifier.
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Accused Products
Abstract
The present invention relates to linking documents through digital watermarking. In one implementation, an identification document is embedded with a first digital watermark. The first digital watermark includes a first identifier. Before issuing a second document, like a boarding pass or ticket, the first identifier is extracted from the identification document. The first identifier is manipulated or altered to produce a second identifier. The second identifier, however, remains related to the first identifier. The second document is embedded with a second digital watermark including the second identifier. Thus, the identification document and the second document are linked through the first and second watermark identifiers.
409 Citations
22 Claims
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1. A method of linking a first document to at least a second document, the first document comprising a first digital watermark including a first identifier, said method comprising:
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decoding the first digital watermark to obtain the first identifier;
providing a second identifier, wherein the second identifier is based on the first identifier, and embedding in the second document a second digital watermark including the second identifier. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of linking a first document to at least a second document, the first document comprising a first digital watermark including a first identifier, said method comprising:
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decoding the first digital watermark to obtain the first identifier;
providing a second identifier, wherein the second identifier is related to the first identifier; and
embedding in the second document a second digital watermark including the second identifier, wherein the second identifier is related to the first identifier through association in a database or data record. - View Dependent Claims (12)
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13. A method of providing security for a printed document, said method comprising:
linking an identification document to the printed document, wherein the identification document comprises at least a photographic representation of a bearer of the identification document, the identification document further comprising machine-readable indicia, said linking comprising;
obtaining a first identifier from the machine-readable indicia carried by the identification document;
providing a second identifier, the second identifier relating to the first identifier; and
printing the printed document, the printed document including the second identifier in the form of machine-readable indicia. - View Dependent Claims (14, 15, 16)
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17. A method of linking an identification document to an electronic file, the identification document comprising a first digital watermark including a first identifier, the identification document further comprising an orientation component to help resolve geometric distortion, the identification document further comprising electronic circuitry, said method comprising:
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obtaining the first identifier;
providing a second identifier, wherein the second identifier corresponds to the first identifier; and
embedding in the electronic file a second digital watermark comprising the second identifier. - View Dependent Claims (18, 19, 20, 21, 22)
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Specification