| 摘要 |
The invention relates to an arrrangement for preventing unauthorized use of a playback apparatus (10,32) such as a cassette-player or a video reproduction device including a dummy cassette (12,13 and 40,41) intended for insertion into a slot or like opening of the playback apparatus (10,32), the dummy cassette including an externally operable mechanism which is arranged in the cavity between the casing parts of the dummy cassette and which is arranged, with the aid of transmission means, to transfer movement to lock means which co-act with the playback apparatus in a manner such that when the lock means occupies a given position the playback apparatus and the dummy cassette form an inseparable unit. The arrangement is characterized in that the transmission means (15,16,17,20 and 33,35,37,38,39) are operative in causing sleeves (18', 19' and 38', 39') to move from a passive or inactive position within the dummy cassette through openings located in a casing part associated with the dummy cassette to an active position in which the sleeves embrace the drive shafts of the playback device.
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