Precision watermarking of covert and overt authentication features
AssigneeCrane Co.
InventorPaul Mirto
Life of this patent
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Abstract
A secure document includes a substrate having a predetermined width and a predetermined length; a first covert feature formed in the substrate; and a second covert feature formed in the substrate, wherein the first covert feature is disposed at a first location on the substrate, the first location corresponding to a first registration region of an authenticating overlay, and wherein the second covert feature is disposed at a second location on the substrate, the second location corresponding to a second registration region of the authenticating overlay.
Claims20
A secure document comprising:
- a substrate having a predetermined width and a predetermined length;
- a first covert feature formed in the substrate;
- and
- a second covert feature formed in the substrate,
- wherein the first covert feature is disposed at a first location on the substrate, the first location corresponding to a first registration region of an authenticating overlay, and
- wherein the second covert feature is disposed at a second location on the substrate, the second location corresponding to a second registration region of the authenticating overlay.
A method of creating a secure document, the method comprising:
- on a substrate having a predetermined width and a predetermined length, forming a first covert feature in or on the substrate;
- and
- forming a second covert feature in or on the substrate,
- wherein the first covert feature is disposed at a first location on the substrate, the first location corresponding to a first registration region of an authenticating overlay, and
- wherein the second covert feature is disposed at a second location on the substrate, the second location corresponding to a second registration region of the authenticating overlay.
Dependencies are inferred from the claim text.