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.
Claims25
A data disc, comprising:
- a first data layer and a second data layer characterized by at least one of angle and an eccentricity parameter;
- and
- encoded information relating to at least one of the angle and the eccentricity parameter.
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The data disc of claim wherein the encoded information is provided in at least one of a burst cutting area and a radio-frequency identification chip for the data disc.
12-13. (canceled)
A method for forming a 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 at least one of:
- a plurality of angles and an eccentricity parameter;
- and
- providing encoded information on the data disc relating to at least one of:
- the plurality of angles and the eccentricity parameter;
- wherein the plurality of angles are defined for a plurality of sector pairs, each sector pair consisting of a first sector in the first data layer and a second sector in the second data layer.
A method of disc authentication, comprising:
- providing a data disc having a first data layer and a second data layer and encoded information relating to at least one of:
- an angle and an eccentricity parameter associated with the first and second data layers;
- measuring at least one of the angle and the eccentricity parameter;
- authenticating the data disc by comparing at least one of the measured angle and the measured eccentricity parameter with the encoded information.
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25-27. (canceled)
An apparatus for disc authentication, comprising:
- a disc reader configured for measuring at least one of:
- an angle and an eccentricity parameter associated with a first data layer and a second data layer of a data disc;
- and
- a processor configured for determining whether the at least one of the measured angle and the eccentricity parameter matches encoded information on the data disc, wherein the encoded information relates to at least one of the angle and the eccentricity parameter.
Dependencies are inferred from the claim text.