Method and apparatus for testing copy protected compact discs
AssigneeMacrovision Corporation
InventorKjeld K. Christensen
Life of this patent
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Abstract
A method and associated apparatus for identifying, to manufacturing test equipment, copy protection information contained on a compact disc (CD). The method includes adding data in standardized industry formats to unused sectors of a CD and providing the capability to test equipment to read the data. The added data is unreadable and ignored by conventional compact disc readers and compact disc drives. The added data is defined by manufacturers and users of copy protection techniques. Additional copy protection verification can be accomplished by using specialized verification tools.
Claims22
A method of marking a compact disc comprising the acts of:
- providing a copy protection scheme;
- identifying a portion of the compact disc not containing program material;
- applying copy protection data related to the copy protection scheme to the identified portion of the compact disc, whereby the copy protection data is readable by compliant test equipment.
A compact disc comprising of:
- program material;
- copy protection data, and
- data identifying the copy protection data, whereby a compliant test apparatus reads the data identifying the copy protection data.
A compact disc test apparatus comprising:
- a demodulator that receives signals from a compact disc under test wherein the compact disc contains copy protection data and identification data identify the copy protection, the demodulator outputting an EFM signal;
- an EFM demodulator coupled to receive the EFM signal and processes the EFM signal into subcode data, the subcode data containing the copy protection data and identification data;
- and
- a subcode processor coupled to the EFM demodulator that receives and reads the subcode data.
Dependencies are inferred from the claim text.