In an optical disk system of the type including an optical disk for performing the recording and reproduction of data by use of a semiconductor laser and an optical disk recording and reproducing apparatus, an optical disk, optical disk recording and reproducing apparatus and copy preventive method for...http://www.google.fr/patents/US4879704?utm_source=gb-gplus-shareBrevet US4879704 - Optical disk, optical disk recording and reproducing apparatus and copy preventive method for optical disks
Optical disk, optical disk recording and reproducing apparatus and copy ...
