Documents and methods involving multiple watermarks
First Claim
Patent Images
1. An identification document including a substrate with printing thereon, the printing comprising:
- a first steganographic watermark, anda second steganographic watermark, whereinthe first steganographic watermark corresponds with a first bit pattern, and the second steganographic watermark corresponds with a second bit pattern, and whereinthe first and second steganographic watermarks are affected in a different manner when the document is subjected to a first corruption process.
6 Assignments
0 Petitions
Accused Products
Abstract
Two or more digital watermarks are embedded in a document. In one implementation the digital watermarks include characteristics that are chosen so that the watermarks will be affected in different manners if the document is subsequently copied or reproduced. A detection method or mechanism reads two or more of the watermarks and compares their characteristics. In another claim, two or more digital watermarks correspond to characteristics that are evaluated for authentication. Of course, other claims are provided as well.
-
Citations
22 Claims
-
1. An identification document including a substrate with printing thereon, the printing comprising:
-
a first steganographic watermark, and a second steganographic watermark, wherein the first steganographic watermark corresponds with a first bit pattern, and the second steganographic watermark corresponds with a second bit pattern, and wherein the first and second steganographic watermarks are affected in a different manner when the document is subjected to a first corruption process. - View Dependent Claims (17)
-
-
2. An identification document including a substrate and printing, wherein the identification document comprises:
-
a first digital watermark comprising a first plural-bit payload; and a second, separate digital watermark comprising a second different plural-bit payload, wherein the first digital watermark and the second digital watermark are provided so as to cooperate for the authentication of the identification document. - View Dependent Claims (3, 4)
-
-
5. A method to determine authenticity of an electronic object, the electronic object comprising at least a first digital watermark and a second digital watermark, said method comprising:
-
utilizing a processor or electronic processing circuitry,detecting from a first electronic signal associated with a first characteristic corresponding to the first digital watermark; utilizing a processor or electronic processing circuitry, detecting from a second electronic signal associated with a second, different characteristic corresponding to the second digital watermark; and comparing the first characteristic and the second characteristic to determine whether the electronic object is authentic. - View Dependent Claims (6, 7, 18, 19, 20, 21, 22)
-
- 8. An object including a first surface with indicia thereon, the indicia comprising at least a first steganographic watermark and a second steganographic watermark, the first steganographic watermark corresponding with a first characteristic and the second steganographic watermark corresponding with a second characteristic, wherein the first and second characteristics are affected in a different manner when the object is subjected to a first corruption process, at least the first steganographic watermark or the second steganographic watermark is associated with a random pattern or function.
Specification