Kazunori Naito

Unauthorized use prevention method for optical disks, optical disk having unauthorized use prevention function, and optical disk apparatus

Method and manufacture for preventing unauthorized use by judging the corresponding relationship between logical and physical addresses

Method and apparatus for preventing unauthorized use by comparing medium identifications

Apparatus for making music database and retrieval apparatus for such database

Optical disk and method of preventing fraudulent use of optical disk rotation synchronous control system

Method and apparatus for preventing unauthorized use in systems having alternative control for avoiding defect areas on recording media

Method and apparatus for producing an optical disk having a read-only area and a rewritable area

Data storage apparatus, data storing method, data verification apparatus, data access permission apparatus, and program and storage medium therefor

Preventing unauthorised use of optical disc e.g. CD-ROM - comparing first information read out from area of disc inaccessible to user with second information concerning authentic disk

Removable storage medium and computer system using the same