Multilayer optical disk and method of its management for preventing its illegal use

The special shape of the optical disk tracking grooves is proposed. These tracking grooves are similar to the blazed diffraction grating grooves. The grooves structure can be read by the standard optical disk reading equipment. The multilayer optical disk with slant tracking grooves is proposed. These grooves have different planes and angles of inclination for different data layers. This allows to direct the signals reflected from the different data layers to the different photodetectors. The optical disk capacity increases due to excluding space between tracking grooves and due to increasing the number of data layers. Sequential and parallel optical disk reading options are possible. The technique of information pits arrangement is proposed for parallel reading of information from several data layers. For protecting of the optical disk against its illegal use the disk is made partly recordable and an initialization procedure is performed at the user's recording/reproducing device. During the initialization procedure identifying parameters of the user's device are recorded onto recordable layer of the disk. Also, the unique combination of the bits pairs containing both information prerecorded on the optical disk and information about the user's recording/reproducing device is remembered in the special flash memory of the user's device.