The data only show that DRM is weakly correlated with lower ebook sales; or, if you like, that foregoing DRM is weakly correlated with higher ebook sales. Whil

The data only show that DRM is weakly correlated with lower ebook sales; or, if you like, that foregoing DRM is weakly correlated with higher ebook sales. While one explanation would be that the presence (or lack of) DRM is the causative factor, I think it's a bit more likely that thoughtful authors both forego DRM and write better books.