Dynamic information storage or retrieval – Storage medium structure – Optical track structure
Patent
1997-10-28
1999-10-05
Neyzari, Ali
Dynamic information storage or retrieval
Storage medium structure
Optical track structure
369 54, 428 641, G11B 724
Patent
active
059635363
ABSTRACT:
An optical recording medium comprising a first substrate with a center mounting hole and having top and bottom surfaces. At least one surface of the substrate is a prerecorded area wherein user data is provided and adapted to be read in an optical recording medium reader device. Over at least a portion of the substrate that can be read by the device is a photosensitive layer comprising a photosensitive material. When the photosensitive material is exposed to a predefined wavelength of light over a predetermined period of time the optical property of at least a portion of the material permanently changes. This change occurs after each copy of the prerecorded area is made. Thereby, the optical recording medium limits the authorized copies of the prerecorded area to a predetermined number.
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Tyan Yuan-Sheng
Vasic Bane V.
Victora Randall H.
Whitcher Timothy J.
Eastman Kodak Company
Neyzari Ali
Owens Raymond L.
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