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US 9,117,487 B2Granted
Method and system for disc authentication and security
AssigneeThomson Licensing
InventorsJohn Matthew Town, Holger Hofmann, Alan Bruce Hamersley
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Abstract
A method and apparatus for disc authentication are disclosed. The authentication method includes measuring at least one physical property of a data disc, which includes at least one of an angle and an eccentricity parameter associated with two data layers of a data disc, and authenticating the disc by determining whether a match exists between the measured property and encoded information on data layer the data disc relating to the physical property.
Claims13
A machine-readable non-transitory data disc, comprising:
- a first data layer and a second data layer characterized by an eccentricity parameter;
- and
- encoded information relating to the eccentricity parameter, wherein the encoded information is for use in authenticating the data disc so that the data disc is authenticated when measured information relating to the eccentricity parameter matches the encoded information.
A machine-readable non-transitory data disc, comprising:
- a first data layer and a second data layer characterized by an eccentricity parameter;
- and
- encoded information relating to the eccentricity parameter, wherein the eccentricity parameter is defined for at least one of:
- the first data layer relative to the second data layer, the first data layer relative to a center of a first substrate containing the first data layer, and the second data layer relative to the center of the first substrate;
- and the eccentricity parameter of the first data layer relative to the second data layer includes a magnitude given by an offset between respective centers of the first and second data layers, and an eccentricity angle defined as a difference between a first angle associated with the first data layer and a second angle associated with the second data layer, wherein the first angle and the second angle are both defined relative to one of:
- a once per revolution pulse, a phase-locked loop, or a predetermined sector boundary on one of the first data layer or the second data layer.
3 more elements
A method for forming a machine-readable non-transitory data disc, comprising:
- forming a first data layer and a second data layer on at least one substrate;
- the first and second data layers characterized by an eccentricity parameter;
- and
- providing encoded information on the data disc relating to the eccentricity parameter;
- wherein the encoded information is for use in authenticating the data disc so that the data disc is authenticated when measured information relating to the eccentricity parameter matches the encoded information.
2 more elements
A method of disc authentication, comprising:
- providing a machine-readable non-transitory data disc having a first data layer and a second data layer and encoded information relating to an eccentricity parameter;
- measuring the eccentricity parameter;
- authenticating the data disc by comparing the measured eccentricity parameter with the encoded information so that the data disc is authenticated when the encoded information matches measured information relating to the measured eccentricity parameter.
A method of disc authentication, comprising:
- providing a machine-readable non-transitory data disc having a first data layer and a second data layer and encoded information relating to an eccentricity parameter associated with the first and second data layers;
- measuring the eccentricity parameter;
- authenticating the data disc by comparing the measured eccentricity parameter with the encoded information wherein the eccentricity parameter is defined for at least one of:
- the first data layer relative to the second data layer, the first data layer relative to a center of the at least one substrate, and the second data layer relative to the center of the at least one substrate;
- and the eccentricity parameter of the first data layer relative to the second data layers includes a magnitude given by an offset between respective centers of the first and second data layers, and an eccentricity angle defined as a difference between a first angle associated with the first data layer and a second angle associated with the second data layer, wherein the first angle and the second angle are both defined relative to one of:
- a once per revolution pulse, a phase-locked loop, or a predetermined sector boundary on one of the first data layer or the second data layer.
3 more elements
An apparatus, comprising:
- a disc reader configured for measuring an eccentricity parameter-associated with a machine-readable non-transitory data disc;
- and
- a processor configured for determining whether the eccentricity parameter matches encoded information on the machine-readable non-transitory data disc, wherein the encoded information is for use in authenticating the data disc so that the data disc is authenticated when measured information relating to the eccentricity parameter matches the encoded information.
Dependencies are inferred from the claim text.