Optical medium with added descriptor to reduce counterfeiting
First Claim
1. A method for adding authenticity information to an optical medium to reduce counterfeit duplication of the optical medium, the method 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 length that produces indeterminate interpretations when read plural times;
reading the descriptor from the optical medium and forming reference descriptor information based on the descriptor, the reference descriptor information including element type information which conveys whether each descriptor element associated with the descriptor is one of;
a deterministic element, the interpretation of which is biased towards a single value;
ora probabilistic element, the interpretation of which is not biased towards a single value;
cryptographically signing the reference descriptor information to provide authenticity information; and
performing physical modifications to the optical medium that add the authenticity information to the optical medium.
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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, signing the reference descriptor information to produce authenticity information, and adding the authenticity information to the optical medium. At a point of consumption, the functionality operates by reading the authenticity information and reading the descriptor. Based on the information that is read, the functionality performs cryptographic analysis and descriptor-based analysis to validate the optical medium. The functionality includes various provisions to reduce the impact of wear and tear on the above-summarized analysis. The functionality can be applied to stamped or recordable optical media.
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Citations
20 Claims
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1. A method for adding authenticity information to an optical medium to reduce counterfeit duplication of the optical medium, the method 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 length that produces indeterminate interpretations when read plural times; reading the descriptor from the optical medium and forming reference descriptor information based on the descriptor, the reference descriptor information including element type information which conveys whether each descriptor element associated with the descriptor is one of; a deterministic element, the interpretation of which is biased towards a single value;
ora probabilistic element, the interpretation of which is not biased towards a single value; cryptographically signing the reference descriptor information to provide authenticity information; and performing physical modifications to the optical medium that add the authenticity information to the optical medium. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An optical medium having authenticity information added thereto to reduce counterfeit duplication of the optical medium, the optical medium comprising:
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a physical descriptor having plural descriptor elements added to the optical medium, the plural descriptor elements corresponding to data-level regions on the optical medium having lengths that produce indeterminate interpretations when read plural times; reference descriptor information based on the physical descriptor, the reference descriptor information reflecting characteristics of the plural descriptor elements corresponding to the data-level regions having the lengths that produce the indeterminate interpretations; and authenticity information, wherein the authenticity information comprises a cryptographic signature applied to the reference descriptor information. - View Dependent Claims (14, 15, 16, 17, 18)
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19. An optical disc having authenticity information added thereto to reduce counterfeit duplication of the optical disc, the optical disc comprising:
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a physical descriptor having plural descriptor elements added to the optical disc, the physical descriptor being produced by providing at least one data-level region having a length that produces indeterminate interpretations when read plural times; reference descriptor information formed based on the physical descriptor, the reference descriptor information including element type information which conveys whether the plural descriptor elements are; deterministic elements, or probabilistic elements; and authenticity information, wherein the authenticity information comprises a cryptographical signature applied to the reference descriptor information. - View Dependent Claims (20)
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Specification