Optical disk, method of reproducing and copying optical...

Details Optical disk, method of reproducing and copying optical... Optical disk, method of reproducing and copying optical...

2006-01-31

2006-01-31

Korzuch, William (Department: 2653)

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

Reexamination Certificate

active

06992959

ABSTRACT:
In a DVD player, when data information in a DVD disk is played back, it is judged whether the data information is protected by a copyright or not on the basis of disk control information. Further, it is judged whether the DVD disk is writable or not, based on whether the DVD disk is provided with a wobble or not. Thus, if the data information is protected by the copyright and the DVD disk is writable, a playback of the DVD disk is prevented so that an illegal use of the DVD disk, which infringes the copyright, is effectively prevented.

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