The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 27, 1999
Filed:
Mar. 17, 1995
Kazuo Nakashima, Kawasaki, JP;
Kazunori Naito, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
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.