Are you serious, implementing any kind of DRM? Here's a way to circumwent “soft-DRM”, “watermarks” in e-books: two independent people obtain the file from its source and then diff them against each other. If there is no difference, obviously the Social DRM isn't able to trace a file found later in the wild back to the original purchaser, and if they are different, just remove the differences and create a plain file without the useless extra garbage which shouldn't have been there in the first place, and wouldn't need to with an ethical, good approach or business model.
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