Electrical computers and digital processing systems: memory – Storage accessing and control – Control technique
Patent
1995-03-17
1999-07-27
Cabeca, John W.
Electrical computers and digital processing systems: memory
Storage accessing and control
Control technique
711 4, G06F 1214
Patent
active
059308257
ABSTRACT:
A recording medium has a medium ID information storing area in a user data area for identification of the recording medium on which software/data is recorded. An original medium ID information storing area, which is regarded as a defect area, is also included in the user data area for storing original medium ID information, wherein the original medium ID information is compared with the medium ID information to judge unauthorized use of the software/data. Further, an alternate area adjacent the user data area is provided for storing data which do not agree with the medium ID information. A method of preventing unauthorized use in a system for reading software/data from a recording medium includes reading medium ID information of the recording medium from which the software is read. Then data from a ROM or a RAM area on the recording medium indicated by a predetermined address is read. The medium ID information and the data are compared, and unauthorized use of the software/data is judged based on the result of the comparison between the medium ID information and the data.
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Naito Kazunori
Nakashima Kazuo
Cabeca John W.
Chow Christopher S.
Fujitsu Limited
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