Dynamic information storage or retrieval – Storage medium structure – Optical track structure
Patent
1995-11-01
1997-11-04
Dinh, Tan
Dynamic information storage or retrieval
Storage medium structure
Optical track structure
380 4, G11B 1724
Patent
active
056847858
ABSTRACT:
A method of preventing a fraudulent use of an optical disk having a read-write region and a read-only region, comprising the steps of: writing data for designating the boundary between the read-write region and the read-only region into a predetermined block of the optical disk; reading the data out of the predetermined block prior to the execution of the software recorded on an optical disk as an object of fraudulent use check; reading data out of a block which is assumed to be in the read-only region by reference to the data read out of the predetermined block, and writing the data read out of the block in the assumed read-only region into the same block; reading data out of a block which is assumed to be in the read-write region by reference to the data read out of the predetermined block, and writing the data read out of the block in the assumed read-write region into the same block; and judging that the optical disk as an object of fraudulent use check is not a fraudulent copy when the data writing operation is impossible in the block in the assumed read-only region but possible in the block in the assumed read-write region.
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Itami Satoshi
Komura Satoshi
Naito Kazunori
Nakashima Kazuo
Utsumi Kenichi
Dinh Tan
Fujitsu Limited
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