Sony is working on a new technology that authenticates devices via the power outlet, allowing for a few interesting applications. The system, based on the Japanese Felica standard, would allow authenticated power usage, power management for cafes and offices, as well as payments for power use. The system could authenticate with the power outlet via a chip inside the laptop or device or through a smartcard that user waves at the outlet. Source: http://techcrunch.com/2012/02/14/sony-to-offer-nfc-authenticated-power-outlets/
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