What if Amazon had a physical proximity limitation to initiating the lending? The Kindle could use its new microphone to chirp back and forth a token, which would be part of the authentication. That would make it simple-stupid to select which friend, neighbor, or truck-stop stranger you want to share with. At the same time, they don't have to worry about the sharing feature getting around *too* well, and the limitation would give better uptake with publishers.
And no, there's too much lag with sharing the audio tokens via phone or internet. You can't cheat that way.
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