Optical disk, an optical disk barcode forming method, an optical disk reproduction apparatus, a marking forming apparatus, a method of forming a laser marking on an optical disk, and a method of manufacturing an optical disk
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsYoshiho Gotoh, Mitsuaki Oshima, Shinichi Tanaka, Kenji Koishi, Mitsuro Moriya
Life of this patent
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Abstract
An optical disk reproduction apparatus is for use with a disk on which data is recorded. A barcode-like mark is reproduced on the optical disk. It is possible to detect whether an identifier is on the optical disk. A decryption key is obtained from identification information included in the barcode-like mark. When the identifier indicates absence of the barcode-like mark, a signal is generated to indicate that the barcode-like mark is not to be reproduced.
Claims28
An optical disk on which data is recorded, wherein in a prescribed region of said disk, an identifier is provided for indicating whether a barcode-like mark is present or not on said optical disk, said identifier and said barcode-like mark are in respectively different locations on said disk, said barcode-like mark disposed in a circumferential direction, and said barcode-like mark having a plurality of bars, each of said bars extending in a radial direction, and,
- said barcode-like mark includes data containing at least an identification information value unique to said optical disk.
An optical disk reproduction apparatus for use with a disk on which data is recorded, wherein in a prescribed region of said disk, an identifier is provided for indicating whether a barcode-like mark is present or not on said optical disk, said identifier and said barcode-like mark are in respectively different locations on said disk, said barcode-like mark disposed in a circumferential direction, and said barcode-like mark having a plurality of bars, each of said bars extending in a radial direction, and wherein a decryption key is obtained from identification information included in said barcode-like mark, said apparatus comprising:
- reproduction means for reproducing said barcode-like mark on said optical disk;
- and
- identifier detection means for detecting said identifier on said optical disk,
- wherein the decryption key is obtained from said identification information, and
- wherein when said identifier indicates absence of said barcode-like mark, said reproduction means is signaled not to reproduce said barcode-like mark.
Dependencies are inferred from the claim text.