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US 2017/0148480 A1Published application
Optical disc authentication by interferometric fingerprinting
AssigneeThomson Licensing
InventorsAlan Bruce HAMERSLEY, John Matthew TOWN, Holger HOFMANN
Life of this patent
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Abstract
Authentication of discs occurs by the use of interferometric authentication data. Such authentication data of a data disc is generated based on an interference pattern associated with thickness variations of a material layer on the disc. The interference pattern represents a unique fingerprint that can be used for authentication of individual discs.
Claims18
A method for disc authentication, comprising:
- directing light through a light-transmissive first disc surface towards at least a first data layer;
- detecting optical interference pattern arising from light reflected from one data layer interfering with light reflected from at least one of the first disc surface and a another data layer;
- and
- authenticating the disc based on the detected optical interference pattern.
1 more element
(canceled)
A method of providing a disc with authentication data, comprising:
- detecting an optical interference pattern arising from light reflected from a one data layer interfering with light reflected from at least one of a disc surface and another data layer on the disc;
- deriving authentication data from the measured optical interference pattern;
- and
- writing the authentication data to a memory.
1 more element
An optical disc, comprising:
- a first disc surface and a first data layer;
- and
- authentication data stored on the disc, wherein the authentication data relates to at least one optical interference pattern arising from light reflected from one data layer interfering with light reflected from at least one of:
- the first disc surface and a another data layer.
1 more element
An apparatus, comprising:
- a photodetector configured for detecting light signals reflected from a data disc;
- and
- at least one processor configured to process detected light signals and generate data based on light intensity modulations arising from light reflected from a first data layer interfering with light reflected from at least one of a read-out surface and a second data layer of the data disc;
- wherein the at least one processor is further configured to perform at least one of (1) storing the generated data for use as authentication data for the data disc, and (2) comparing the generated data with predetermined authentication data for authenticating the data disc
1 more element
Dependencies are inferred from the claim text.