Method for preventing unauthorized used of CD, optical disk based on the same method and its producing method

Application Number: 00108551
Application Date: 2000.05.16
Publication Number: 1323028
Publication Date: 2001.11.21
Priority Information:
International: G11B7/007;G11B7/24
Applicant(s) Name: K.K.Optrom
Inventor(s) Name: Saito Tetsuo;Kada Ichitaka
Patent Agency Code: 11038
Patent Agent: du rixin
Abstract The method of protecting CD against illegal use is simple and has no need of changing the hardware structure of CD driver and the software program of computer related to the CD driver. The implement method and production process of the CD are also disclosed. The said CD includes one no-signal section inside the selected data record area. The section consists of one no-signal plane along one data recording track, which has enough length to make the optical pick-up incapable of tracking the said data recording track.