Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Patent
1996-10-21
1997-12-30
Edun, Muhammad N.
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
369 53, 369 47, 3692755, G11B 700
Patent
active
057038589
ABSTRACT:
A device for enabling detection of a counterfeit optical CD-ROM is disclosed for use in a conventional mastering system. The device includes a signal source for providing a first signal for forming a predetermined defect in a glass master. The device also includes a switch for connecting a recorder of the mastering system to the signal source. In addition, the device includes a decoder for decoding encoded data and address information provided from an input source of the mastering system. Furthermore, the device includes a central processor unit which serves to detect whether a selected address from the decoded data is present. Upon detection of the selected address, the CPU controls the switch to connect the signal source to the recorder to enable the recorder to receive the first signal and form the predetermined defect at the selected address. When a CD-ROM manufactured from the glass master is played back, a desired error signal is generated at the predetermined address indicating that the CD-ROM is not counterfeit. Further, when a counterfeit CD-ROM is played back, the desired error signal is not generated at the predetermined address, thus enabling detection of the counterfeit CD-ROM. In addition, the defect is not visible to the unaided eye when the CD-ROM is viewed.
REFERENCES:
patent: 5226027 (1993-07-01), Bakx
patent: 5400319 (1995-03-01), Fite et al.
"Disc Label Designer Graphic Editor & Disc Label Generator" Series 500 Mastering Modules, Optical Disc Corporation, Santa Fe Springs California.
"SID Code Finalised--Now Its Official,"ONE to ONE, p. 26, Mar./Apr., 1994.
"SID Code: Majors Move Ahead," ONE to ONE, International News, p. 5, Feb., 1994.
"GATT--Trips . . . And Falls Over," ONE to ONE, International News, p. 16, Feb., 1994.
Fite Barry Alan
Mitchell Michael L.
New Anthony C.
Saito Akiya
Digital Audio Disc Corporation
Edun Muhammad N.
Miller Jerry A.
Musacchio Pasquale
Sony Corporation
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