| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical disk of limited reproduction time, which can prevent information from being semi-permanently dispersed by limiting reproduction time. <P>SOLUTION: This is a WORM (write-once/read-many) type optical disk and characterized by a limited reproduction time in which reproduction properties of recorded data as well as reproduction time are lowered to make accurate reproduction impossible. The lowering of the reproduction properties is desirably achieved by increase in jitter. <P>COPYRIGHT: (C)2003,JPO |
