While I can see that DRM may indeed stop SOME casual sharing, I think it stops far less than you think. It does not stop the set of eBook shoppers who don't mess with DRM stripping. It only stops the subset of them who, one, have the means and motive to share files, that is, the have the tech ability to share files and a circle of friends capable of using them, and two, have no one in their circle capable of stripping DRM for them. I think that is actually a very small subset. I personally know not a single member of it.
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