Copy protection marks on a transparent layer of an optical disk

Details Copy protection marks on a transparent layer of an optical disk Copy protection marks on a transparent layer of an optical disk

1998-01-26

2000-08-15

Dinh, Tan

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 84, 369 54, 3692753, G11B 700

Patent

active

061046868

ABSTRACT:
A method for constructing an optical disk and a method of signal detection which permits a read only device, such as a CD-ROM or DVD-ROM reader, to create a permanent mark on a disk in such a way that it can be subsequently determined that the disk had been previously accessed is disclosed. Such a disk facilitates the operation of CD-ROM or DVD-ROM based systems where the behavior depends on whether or not the information on the optical disk had been previously accessed.

REFERENCES:
patent: 5128849 (1992-07-01), Podraczky et al.
patent: 5761301 (1998-06-01), Oshima et al.
patent: 5841861 (1998-11-01), Kondo et al.
patent: 5862121 (1999-01-01), Suzuki
patent: 5963536 (1999-10-01), Vasic et al.

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