Quote:
Originally Posted by BWinmill
Even if there is a way to deactivate purchased files, deactivation doesn't always work. An example of what can go wrong using Adobe's DRM: it is possible to borrow a library book with your computer, copy it onto your ereader, disconnect your ereader from your computer, then return the library book with your computer. The book will not function on your computer, but it will still function on your ereader. I would imagine that you could game deactivation on purchases in a similar way if such mechanisms existed. Even if the purchase could be reliably deactivated, people could still strip the DRM from the book before returning it.
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Very little in life is certain. Amazon can remove ebooks from Kindles, but only if the DRM hasn't been removed. My point was that if there is a deactivation mechanism, then it gives the seller a way to have the ebook "returned" in exchange for a refund. It's not 100% effective, but neither are DRM or geo-restrictions.