| 摘要 |
Optical storage media with limited useful life include a substrate having a data storage portion containing readable data. A reservoir associated with the substrate releasably retains a preselected chemical agent that interacts with the data storage portion to render it unreadable a preselected period of time after the chemical agent is released. Alternatively, the invention includes an optical storage medium including a substrate supporting a metallic data storage layer for storing optically readable data, a reservoir located in proximity to the data storage layer for storing a chemical agent in contact with the data storage layer on a first side of the reservoir, and a flexible metallic lamina in contact with the chemical agent on an opposite side of the reservoir. A nonconductive member is located intermediate the data storage layer and the lamina for holding apart the data storage layer and the lamina, and has at least a portion through which the lamina can be deformed and come into contact with the data storage layer to complete a voltaic circuit from the data storage layer through the chemical agent to the lamina. Opening the storage container releases the chemical agent or completes the voltaic circuit, and starts the interaction with the optical storage medium, which will become unreadable after a preselected period of time. |
