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:
Mar. 06, 2001
Filed:
May. 27, 1999
Kazunori Naito, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A method of preventing unauthorized use includes defining a first original medium ID information stored in a predetermined order which indicates a location of the defect area of an original recording medium, when a block of data to be stored in a defect area of recording media is to be read in a system which has an alternative control for reading a block of data from an alternate area instead of the defect area without accessing the defect area. The method also includes defining a second original medium ID information as a part of data which is stored in the original recording medium and which is to be prevented against unauthorized use, reading out the first original medium ID information from the predetermined address of a recording medium to be judged for unauthorized use and reading out the second original medium ID information as a part of data from the recording medium to be judged. The final step includes judging unauthorized use of data based on the read out first original medium ID information and the read out second original medium ID information.