iTunes music style DRM (signed files) is the answer. DRM removal is not the answer to flat (soon falling?) eBook sales. I fear, however, that my app.net friends who think this is an easy solution to eBook DRM problems are operating on a higher plain than I. I was able to remove the Adobe DRM and open it in iBooks on my iPhone. Today I purchased a genuine Google Play Adobe Editions DRMd book. So I could easily put the ePUBs in Google Drive, upload to Google Play and drop them into iTunes for use on my iPhone. (Bonus: Fixing Adobe Digital Edition crash.), but my efforts to put the books I own on my personal device were frustrated when it turned out all of my Google Play books were DRM free. I previously wrote EPUB and DeDRM: Why Google Play Store is the best eBookStore for iBooks fans.