An optical media disk is treated with a light-sensitive material that impedes the ability of a optical media player from reading data stored on the disk. This light-sensitive material is a material changes phase upon exposure to one or more wavelengths of light. During the initial phase, the light-sensitive...http://www.google.com/patents/US20060114755?utm_source=gb-gplus-sharePatent US20060114755 - Deterring theft of optical media
