MACHINE-READABLE SYMBOLS
2 Assignments
0 Petitions
Accused Products
Abstract
A variety of forms of machine-readable symbols are disclosed, as well as methods and systems of constructing machine-readable symbols, methods and systems of acquiring machine-readable symbols, and methods and systems of decoding machine-readable symbols.
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Citations
140 Claims
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1-96. -96. (canceled)
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97. A copy-resistant symbol comprising:
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a substrate; and a machine-readable symbol instantiated on the substrate, wherein; the machine-readable symbol represents a combination of substantive information and encrypted security information; and a decryption of the encrypted security information identifies a security feature of the copy-resistant symbol identifiable through optical imaging of the copy-resistant symbol. - View Dependent Claims (98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111)
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112. A method of reading a copy-resistant symbol having a substrate and a machine-readable symbol instantiated on the substrate, the method comprising:
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optically acquiring the machine-readable symbol from the copy-resistant symbol; decoding the machine-readable symbol to derive a message; decrypting a portion of the message by applying a decryption key to the portion of the message; determining a security feature from the decrypted portion of the message; and confirming a physical presence of the security feature on the copy-resistant symbol. - View Dependent Claims (113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126)
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127. An optical reader comprising:
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an illumination source disposed to illuminate a presented copy-resistant symbol; a detection device disposed to receive light scattered from the presented copy-resistant symbol; and a computational unit interfaced with the detection device and having; instructions to optically acquire a machine-readable symbol from the presented copy-resistant symbol; instructions to decode the machine-readable symbol to derive a message; instructions to decrypt a portion of the message by applying a decryption key to the portion of the message; instructions to determine a security feature from the decrypted portion of the message; and instructions to optically confirm a physical a presence of the security feature on the presented copy-resistant symbol with the detection device. - View Dependent Claims (128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140)
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Specification