| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent the use of data illegally copied onto a recording medium such as an optical disk. <P>SOLUTION: The main controller 35 of a host computer 3 executes a data acquisition step of acquiring, from an optical disk, unique data that is recorded on an information track on the optical disk in accordance with a predetermined rule, the optical disk being loaded on a optical disk unit 1, and an authentication step of authenticating the optical disk based on the unique data acquired in the data acquisition step. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
