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Light sensitive or other materials that are adapted to change state and affect reading of a storage medium are used to control access to data that may be stored on optical medium and/or to control...http://www.google.es/patents/US7486790?utm_source=gb-gplus-sharePatente US7486790 - Method and apparatus for controlling access to storage media B???squeda avanzada de patentes N???mero de publicaci???
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