I routinely remove the DRM from my books and back them up. Then one day I started noticing that I couldn't remove the DRM from a few of my books. It turns out that they didn't have any DRM, and simply changing the file type from .AWZ to .PRC was all I needed to do in order to "remove" the DRM. I can't remember the name of any specific titles, but I'm pretty sure when they send you a sample chapter they don't have DRM.
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