There has been some discussion of the meaning of the appearance of "Simultaneous Device Usage:" in the Product Details of Kindle Books at Amazon's Kindle Store.
I believe it's pretty simple. If a book has
Quote:
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Simultaneous Device Usage:Unlimited
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in the Prodcut Details then it is DRM-free. If some other limit is given, or if "Simultaneous Device Usage:" does not appear, then the book has DRM.
This simple rules works for all the Amazon books I've bought.
I will change my opinion on this if anyone can produce a counter-example. That is, either a book that is listed with "Simultaneous Device Usage: Unlimited" and yet has DRM, or that does not have "Simultaneous Device Usage: Unlimited" and yet is DRM-free.
I don't believe that there is such a counter-example.