Lets say that a reader switches to a different brand of reader, and wants to migrate their books. Or two people get married, and they have two different brands of readers, and want to merge their bookshelves. They aren't asking for anything but to be able to read books that they paid for. If they can easily move their books, they will do that. But the more difficult you make it, the more likely that they won't even bother to remove the DRM, but instead simply download the book from pirate sites. Once they are going to pirate sites, they become increasingly likely to download not only books they have already paid for, but to download books that they haven't paid for.
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