Method and manufacture for preventing unauthorized use by judging the corresponding relationship between logical and physical addresses

A recording medium comprising:

• software/data storing area for storing software which are read from physical addresses on an recording medium in accordance with logical addresses instructed by a controller;
• relationship information storing area for storing information of relationship between said physical addresses and said logical addresses for reading the software/data from the recording medium;
• and
• original relationship information storing area for storing original relationship information between the physical addresses and the logical addresses, for reading the software/data from an original recording medium and for identifying unauthorized use of the software/data based on a comparison between said relationship information and said original relationship information.

A method of preventing unauthorized use in a system wherein software is written in a recording medium at prescribed physical addresses thereof, the software is read out from these physical addresses in the order of logical addresses and the software is executed, said method comprising the steps of:

• providing a table, which stores a corresponding relationship between the physical addresses and the logical addresses of the software, and a security program for preventing unauthorized use of the software;
• obtaining a corresponding relationship between physical addresses on the recording medium, on which the software has been stored, and logical addresses by executing the security program before said software is executed;
• comparing this corresponding relationship with the corresponding relationship in said table;
• and
• preventing unauthorized use of the software by disallowing execution of the software in a case where result of the comparison indicates that use of the software would be unauthorized.