Optical disk, an optical disk barcode forming method, an optical

Details Optical disk, an optical disk barcode forming method, an optical Optical disk, an optical disk barcode forming method, an optical

1996-05-16

2000-04-18

Oen, William

Cryptography

Cryptanalysis

H04L 900

Patent

active

060524650

ABSTRACT:
Disclosed is an optical disk barcode forming method wherein, as information to be barcoded, position information for piracy prevention, which is a form of ID, is coded as a barcode and is recoded by laser trimming on a reflective film in a PCA area of an optical disk. When playing back the thus manufactured optical disk on a reproduction apparatus, the barcode data can be played back using the same optical pickup.

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