A locking device is provided to prevent pilferage of a compact disc from within a storage cassette, the locking device including a locking plate which is positionable over the disc and which is locked to a circular array of spring fingers of the cassette providing a support for the compact disc....http://www.google.es/patents/US4750618?utm_source=gb-gplus-sharePatente US4750618 - Arrangement for securing of recording disk, in particular compact disk plate, against unauthorized taking
Arrangement for securing of recording disk, in particular compact disk plate ...
