OPTICAL DISK AND OPTICAL DISK DRIVE

摘要

A write-once DVD (1) has a read-in area provided inside a data area (5) where digital information on document, image, or sound is recorded and including a prepit (9) holding copy managing key information for preventing unauthorized copy from a source disk to the DVD (1) and a test area (3) provided inside the read-in area (4) and used for adjusting the power characteristics of the DVD (1). Therefore, information recorded on a source disk is physically prevented from being copied onto the DVD (1) without good cause because of the copy managing key information recorded in the prepit (9).