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Re:Adobe to Require New Epub DRM in July, Expects to Abandon... by SyneRyder on Tuesday February 04, 2014 @04:08AM (#7176307)
"There are also some unexpected restrictions on some titles, such as books that are viewable only on 1 or 2 of your devices..."

You can check this when purchasing on Amazon: the small print you're looking for in the Product Details section is "Simultaneous Device Usage: Unlimited". If you don't see that, it means your Kindle book is restricted (I believe to 5 devices simultaneously, though perhaps it varies from book to book.)

Re:Adobe to Require New Epub DRM in July, Expects to Abandon... by fbags on Tuesday February 04, 2014 @06:05AM (#7176702)
It varies from book to book. Some of them are only 1 or 2 devices. The annoyance is that I inevitably forget which books are device limited and end up unable to open them from work / while traveling / etc.