Optical disk, optical disk recording and reproducing apparatus, method for recording, reproducing and deleting data on optical disk, and information processing system

Abstract

A recording type optical disk on which data is recordable includes a data recording and reproducing area for recording data therein and reproducing data therefrom, and a read-only disk identification information area for recording disk identification information for identifying the optical disk therein. In the optical disk, the disk identification information is formed by removing a reflection film that is formed on the optical disk in a strip shape. The disk identification information includes an inherent disk identifier for each optical disk, and the data recording and reproducing area includes an area for recording encrypted data therein. The encrypted data is encrypted by using information including the disk identification information for identifying the optical disk as a key.

1 . An optical disk recording and reproducing apparatus for controlling at least one of: 
 (a) a recording operation for recording data in a data recording and reproducing area of an optical disk of recording type on which data is recordable, and (b) a reproducing operation for reproducing data from the data recording and reproducing area,    wherein said optical disk includes a disk identification information area for recording therein disk identification information for identifying said optical disk, and    wherein said optical disk recording and reproducing apparatus comprises;    reproducing means for reproducing said disk identification information from said disk identification information area; and    control means for judging whether or not at least one of the recording operation and the reproducing operation is performed based on the reproduced disk identification information, and for controlling said optical disk recording and reproducing apparatus to perform at least one of the recording operation and the reproducing operation in response to a judgment result.