By not buying DRM protected ebooks you don't send any message to them. There are too many unknown reasons/variables. However, if people buy DRM protected books and they hack the DRM and it becomes a world-wide-easy accessible knowledge and also their DRM protected books appear as DRM stripped ebooks on darknet, all of this after huge money investment into DRM protection in the first place, they might start to think, whether it is worth the trouble.
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