Matsushita Electric Industrial Co., Ltd.

Kouhei Nakata

Mitsuaki Oshima

Takashi Ishida

Motoshi Ito

Mamoru Shoji

Atsushi Nakamura

Yuji Takagi

Shunji Ohara

Hideshi Ishihara

Takahiro Nagai

Takashi Yumiba

Tadashi Jahana

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.

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

Growing community of inventors

Hyogo, Japan

Kouhei Nakata