title_body: How does DRM impact the sales of eBooks?
upvoted_answer: There was a study1 done by Laurina Zhang about the effects of DRM on music sales. In her conclusion1 she states:
  
  
    My analysis in this paper, based on a large representative sample of
    albums from all four major record companies, sheds light on this
    question. I find that the removal of DRM increases digital sales by
    10%.
  
  
  While this does not directly address the eBook industry, it does suggest that DRM may also have a negative impact on sales of Ebooks.
  
  1Warning: Links directly to pdf.