So if we want to convert iBooks to PDF, we must remove the Apple Fairplay DRM first. It is impossible convert a book with DRM. What makes iBooks unable to import to non-apple device and other? The Apple Fairplay DRM. Open ~_Library_Mobile Documents_iCloud~com~apple~iBooks_Documents Make iBooks DRM Free You’ll have to open the folder via the Terminal app with this command: If you try to navigate there manually in Finder, it will switch to showing you the iCloud documents folder instead.
You can’t access the second location the usual way. ~_Library_Mobile Documents_iCloud~com~apple~iBooks_Documents/ Sync is on if the checkbox next to iBooks appears selected. Not sure if you have enabled cloud sync for your iBooks files? go to System Preferences > iCloud > iCloud Drive > Options… to find out.