| 20080225663 | METHOD AND APPARATUS FOR DETERMINING IF AN OPTICAL DISK ORIGINATED FROM A VALID SOURCE - A method and apparatus for determining if an optical disk originated from a valid source, the method and apparatus scanning one major surface of the optical disk for imperfections, storing the locations of the imperfections relative to a datum, comparing a parameter of each of the locations of the imperfections with corresponding parameters of a master disk of known source for determining if the disk originated from the source from which the master disk originated. | 09-18-2008 |
