Optical Medium with Added Descriptor to Reduce Counterfeiting
First Claim
1. A method for providing authenticity information associated with an optical medium to reduce counterfeit duplication of the optical medium, comprising:
- adding a descriptor having plural descriptor elements to the optical medium, the descriptor being produced with an intent of providing at least one data-level region having a feature that produces indeterminate interpretations when read plural times;
reading the descriptor from the optical medium and forming reference descriptor information based on the descriptor;
producing authenticity information based on the reference descriptor information; and
providing the authenticity information for use by a verification site.
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Abstract
Functionality is described for reducing the unauthorized reproduction of optical media, such as optical discs of various types. The functionality operates by adding a physical descriptor to an optical medium, forming reference descriptor information based on the descriptor (by reading the descriptor Lr times), producing authenticity information based on the reference descriptor information, and providing the authenticity information to a disc use site via various modes. At the disc use site, the functionality operates by reading the authenticity information and reading the descriptor Lv times (where Lv may not equal Lr). Based on the information that is read, the functionality performs cryptographic analysis and descriptor-based analysis to validate the optical medium. The descriptor can be formed on a closed loop of the optical medium. The functionality also includes provisions for reducing the possibility that unwanted correction is performed, which may interfere with analysis of the descriptor.
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Citations
20 Claims
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1. A method for providing authenticity information associated with an optical medium to reduce counterfeit duplication of the optical medium, comprising:
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adding a descriptor having plural descriptor elements to the optical medium, the descriptor being produced with an intent of providing at least one data-level region having a feature that produces indeterminate interpretations when read plural times; reading the descriptor from the optical medium and forming reference descriptor information based on the descriptor; producing authenticity information based on the reference descriptor information; and providing the authenticity information for use by a verification site. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An electronic descriptor checking system that forms a part of an operating environment, comprising:
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a code reading component configured to read authenticity information associated with an optical medium from at least one source of authenticity information; an examination component configured to read a descriptor from the optical medium and form in-field descriptor information based on the descriptor, the descriptor having multiple descriptor elements; and a comparison component configured to determine whether the optical medium is valid by comparing the in-field descriptor information with reference descriptor information obtained from the authenticity information, the environment being set up to reduce a possibility that the examination component will perform unwanted correction of symbols in a course of producing the in-field descriptor information. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. A method for reading a descriptor formed on an optical medium, comprising:
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reading a descriptor that has been added to the optical medium Lr times and forming reference descriptor information based on the descriptor, the descriptor being produced with an intent of providing at least one data-level region having a length that produces indeterminate interpretations when read plural times; and at a verification site, reading the descriptor Lv times and forming in-field reference descriptor information based on the descriptor, where Lr does not equal Lv. - View Dependent Claims (20)
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Specification