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With Adobe you set up an account with Adobe Digital Editions and then you register your "device" to that account.
There is a limit (I think it is 6 but I'm not sure) of how many devices can be registered to one Adobe Digital Account. Once you reach that limit you can contact Adobe and they will free up the space from the old devices you aren't using anymore. People have reported problems in actually getting Adobe to do that.
My advice is to learn how to liberate your books of DRM and buy your digital reader based on the device that has the features you like. After all, if you buy a nook or a Sony next - won't you want to read your Amazon books that you've bought on that device and whatever devices you own in the future?
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