Systems and methods for media authentication
First Claim
1. A method for authenticating a removable digital medium by determining the presence of an anomaly region corresponding to a data segment of the removable digital medium comprising:
- performing multiple read operations on a data segment of the removable digital medium to generate multiple corresponding read data results;
calculating corresponding digital signatures using actual data values of underlying data of the read data segment for each of the multiple read data results;
determining whether an anomaly region is present in the data segment based on a comparison of the digital signatures by determining whether any of the digital signatures are equal in value, and if a predetermined number of the digital signatures are not equal in value, determining the anomaly region to be present; and
authenticating the removable digital medium in response to the determination of the presence of the anomaly region.
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Accused Products
Abstract
A method and system for authenticating a digital optical medium, such as a CD-ROM, determine whether the medium is an unauthorized copy, or the original. The original media is created, or altered, so as to contain anomalous locations from which the transfer of data is accomplished at different rates than a standard digital copy would exhibit. One implementation of the process involves timing analysis of the differences in data transfer rates. Another implementation involves the determination of digital signatures during multiple read operations performed on a data segment. The process can be employed in systems that control access to unauthorized copies, or may be used for other informative purposes. Theft, distribution, and piracy of digital content on optical media, such as computer software (also games, video, audio, e-book content), is often accomplished by copying it directly to another disc using commonly available copy tools and recordable optical media, or the replication of media to another mass manufactured disc. The present invention, which helps to irrefutably identify a unit of optical media as the original, and can correspondingly identify any copy made by any currently available means as such a copy, may prevent an unauthorized individual from making use of any unauthorized copies. This offers significant advantages to content creators who wish to protect their products.
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Citations
12 Claims
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1. A method for authenticating a removable digital medium by determining the presence of an anomaly region corresponding to a data segment of the removable digital medium comprising:
- performing multiple read operations on a data segment of the removable digital medium to generate multiple corresponding read data results;
calculating corresponding digital signatures using actual data values of underlying data of the read data segment for each of the multiple read data results;
determining whether an anomaly region is present in the data segment based on a comparison of the digital signatures by determining whether any of the digital signatures are equal in value, and if a predetermined number of the digital signatures are not equal in value, determining the anomaly region to be present; and
authenticating the removable digital medium in response to the determination of the presence of the anomaly region. - View Dependent Claims (2, 3, 4, 5, 6)
- performing multiple read operations on a data segment of the removable digital medium to generate multiple corresponding read data results;
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7. A system for authenticating a removable digital medium by determining the presence of an anomaly region corresponding to a data segment of the removable digital medium comprising:
- a read unit for performing multiple read operations on a data segment of the removable digital medium to generate multiple corresponding read data results;
a calculating unit for calculating corresponding digital signatures using actual data values of underlying data of the read data segment for each of the multiple read data results; and
a determining unit for determining whether an anomaly region is present in the data segment based on a comparison of the digital signatures by determining whether any of the digital signatures are equal in value, and if a predetermined number of the digital signatures are not equal in value, the determining unit determining the anomaly region to be present; and
a means for authenticating the removable digital medium in response to the determination of the presence of the anomaly region. - View Dependent Claims (8, 9, 10, 11, 12)
- a read unit for performing multiple read operations on a data segment of the removable digital medium to generate multiple corresponding read data results;
Specification