Yoshiho Gotoh

Optical disk, an optical disk barcode forming method, an optical disk reproduction apparatus, a marking forming apparatus, a method of forming a laser marking on an optical disk, and a method of manufacturing an optical disk

Information recording medium, information recording method, information recording apparatus and information reproducing apparatus

Recording/reproducing method suitable for recording/reproducing av data on/from disc, recorder and reproducer for the method, information recording disc and information processing system

Method and apparatus for preventing illegal copy or illegal installation of information of optical recording medium

Mark forming apparatus, method of forming laser mark on optical disk, reproducing apparatus, optical disk and method of producing optical disk

Optical disk, method for recording and reproducing write-once information on and from optical disk, optical disk reproducing device, optical disk recording and reproducing device, device for recording write-once information on optical disk, and optical disk recording device

Information recording medium, information recording method and information recording/reproduction system

Optical disk, optical recorder, optical reproducing device, encrypted communication system, and authorizing system for use of program

Optical disk, optical recorder, optical reproducer, crytocommunication system and program license system

Optical disc recording apparatus, computer-readable recording medium recording a file management program, and optical disc