| 摘要 |
An authorisation system 30 for permitting apparatus such as a vehicle or computer to function normally in the presence of a suitably authorised user 12 comprises an apparatus-carried part 34 and a user-carried part 36 of wireless communication means. The parts communicate within a spatial envelope defining a permissible working relationship and a suitably established communication link authorises normal functioning of the apparatus. The system responds to interruption of a communications link with apparatus that is functioning to inhibit the normal functioning after a delay, measured as time or distance, whereby if the apparatus is forcibly taken from the authorised user (e.g. in a hijacking incident), the user's safety is not jeopardised by the proximity of the non-functional apparatus. The user part may be carried discreetly and unobtrusively within minimum size if powered by radiation from the apparatus part, and may be an unpowered tag that returns radiation with a characteristic identification.
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