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Adobe can control the number of devices you can register. I thought it was 6 (but maybe it's 3), but they slowly allow more to an account over time to account for old devices you're no longer using, since you can't get slots back by deregistering. I've registered a lot more than 3 devices/apps to my account since I first started using ADE in 2007. However, separately the content server can also be set for how many different devices you can transfer to, including none. That depends on how the vendor has things set up. I remember this, because it was at one time a problem when Simon & Schuster first switched to ePub and had their server settings wrong. This is why Alfing is so popular around here.
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