Patent ID: 8355311
Filing Date: 2013-01-15
Classification: G11B

Abstract:
1. An optical storage medium comprising: a first data layer, the first data layer being accessible for an unlimited period of time; a second data layer, the second data layer being accessible for a limited period of time only; a reactive layer for covering the second data layer, the reactive layer for determining the limited period of time that the second layer is accessible, a first diffusion barrier layer located above the reactive layer, a second diffusion barrier layer located beneath the reactive layer, wherein the first diffusion barrier layer covers a first portion of the reactive layer, wherein the second diffusion barrier layer covers a second portion of the reactive layer, wherein the first diffusion barrier layer causes a first portion of the second data layer to become inaccessible prior to a second portion of the second data layer, wherein the second data layer is adapted to store access data for controlling access to at least a portion of the first data layer; and wherein the second layer stores a decryption key that is permanently transferred to a player prior to the expiration of the limited period of time during which the second layer is accessible.