PRE RECORDED CD ROM DISCS DVD

Brand	Owner (click to sort)	Address	Description
LEARNING-FOCUSED	LEARNING-FOCUSED SOLUTIONS, INC.	P.O. Box 128 Marion NC 28752	[Pre-recorded cd-rom discs and dvd discs featuring teacher education];Educational books, pamphlets, brochures, folders, paper labels, cards, notebooks, posters for teacher education;LEARNING;
LEARNING-FOCUSED	Dr. Max S. Thompson	5 Ashton Court Greensboro NC 27410	[Pre-recorded cd-rom discs and dvd discs featuring teacher education];Educational books, pamphlets, brochures, folders, paper labels, cards, notebooks, posters for teacher education;LEARNING;
	Where the owner name is not linked, that owner no longer owns the brand

Technical Examples

The method and apparatus described utilise the fact that CDs manufactured from the same master will have distinctive physical characteristics attributable to the physical manufacturing process of the master to distinguish counterfeit CDs from genuine discs. For a genuine disc, the relative angular orientation of specified sections of the recorded data are determined and recorded. The relative angular orientation of the same sections of data on a test disc are also determined. Where the relative angular orientations are the same it is concluded that the test disc derives from the same source as the genuine disc and is therefore bona fide. Where there is no correlation, the test disc may be identified as counterfeit. The relative angular orientations, or other physical characteristics of the discs, may be physically measured, or may be calculated from information gained by reading the data on the disc. The disclosed technique can also be used to copy protect discs.