Patent ID: 8488428
Filing Date: 2013-07-16
Classification: G06K,G11B

Abstract:
1. An optical article for playback in a player comprising: a first file encoded on the optical article comprising data structure information, wherein the data structure information comprises information required for the player to access and play video content in each video title stored on the optical article; a second file encoded on the optical article comprising a backup of the first file; wherein at least one of the first file or the second file must be fully readable for the player to play the video content on the optical article; and a mark disposed on at least a portion of the optical article where the first file is encoded and disposed on at least a portion of the optical article where the second file is encoded; wherein the mark comprises an optical state change material that undergoes a change in its optical state when exposed to an activation signal selected from one or more of a laser, thermal energy, infrared rays, X-rays, gamma rays, microwaves, visible light, ultraviolet light, ultrasound waves, radio frequency waves, electrical energy, chemical energy, magnetic energy, and mechanical energy; wherein the optical article is transformed from a pre-activated state, where the player is unable to read either of the first or second file, to an activated state, where the player is able to read either of the first or second file, when an authorized activation method is used to activate the mark; and wherein the optical article is transformed from the pre-activated state to an incorrectly activated state, where the player is unable to read either of the first or second file, when an unauthorized activation method is used to activate the mark.