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The security systems for the One Laptop per Child computer are quite brilliant:
Beyond cyberthreats, the XO laptop will have an anti-theft system designed to render stolen laptops useless. Each XO is assigned a "lease," secured by cryptography, that allows it to operate for a limited period of time. The laptop connects to the internet daily and checks in with a country-specific server to see if it's been reported stolen. If not, the lease is extended another few weeks.
If the lease expires, the XO's internet connectivity is turned off, and shortly thereafter the whole computer becomes a brick. In the case of an area without internet connectivity, a local school can extend the lease from its own server by Wi-Fi or with a USB dongle.
