Yeah, it says simultaneous. But that isn't how it works, in practice. It's six (or five, if it's by an indie author) total devices. The license stays with the device, even after the books are removed, even if the device is de-registered. There really is no method of releasing the license, as you would do at, say, fictionwise, where you can just change your PID's and re-download a book.
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