Laser pointer helped find pirated discs.

Five Spanish physicists from the University of Grenada, have developed a simple method by which to distinguish the license from the disc piracy, said the journal Science. It is based on the difference in recording technology licensing and pirated discs.
To determine the license disc or not, scientists have used ordinary laser pointer, which are light on the mirror surface. When the light from pointer coming to the surface of licensed disc, it was visible only bright point. If the disc pirate, the top and bottom of the points appeared parallel lines.
Researchers stress that conducted a similar experiment with a hundred optical discs. They have different content and were produced by different manufacturers. As a result, physicists have concluded that their method is absolutely accurate.
American physicist Chunle Go (Chunlei Guo) from the University of Rochester, New York, confirms the effectiveness of a method to identify counterfeit disc or not using a laser pointer. He believes that the opening should be used to strengthen the fight against piracy.