| 摘要 |
Wireless LANs can be used to provide connectivity over limited areas such as public spaces and publicly-accessible premises, both commercial and non-commercial. A variety of digital objects can be made available via a wireless LAN which can enhance the experience of persons in its coverage zone. Indeed, the availability of such digital objects (such as unusual graphic images and readings by authors of their works) can be a strong incentive for people to frequent the coverage zone. This obviously has application to premises wishing to attract people. However, the incentive to visit provided by the digital objects is degraded rapidly if it becomes easy to download copies of the digital objects into a mobile device and take them away for future enjoyment. In order to limit such activity, functionality required by mobile devices to make use of the digital objects, is so arranged that in order to operate, it requires the continual reception of enabling signals from a wireless LAN of a restricted group of wireless LANs with which the digital object is associated.
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