| 摘要 |
PROBLEM TO BE SOLVED: To surely prevent the reading of information by a third party in order to prevent the leakage of secrets in an optical disk reproducing device. SOLUTION: For example, a light source driving circuit 22 for causing a light source 21 to emit a light is connected to a system control 16 for controlling the entire device. This light source driving circuit 22 is controlled and, by causing the light source 21 to emit a light, the reflection rate of the recording layer of a part having no changes in a reflection rate on an optical disk 11 is changed. Thus, when the optical disk 11 is discarded or the like, by destroying information itself recorded on the optical disk 11 without any artificial destruction, the reading of the information recorded on the optical disk 11 is made impossible.
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