I bought a book on the iBooks Store. Is there any way to know what format it is and what protection if any it has? (PDF/EPUB, type of DRM, etc.)
I use an iPad 3 with iBooks version 3.2 (last update: 2013.11.14).
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You can use iTunes to find out the format of the books on your iPad.
The window that appears will tell you the "Kind" of book it is. If I remember correctly they are "Protected book" for IBA or EPUB books with DRM, "Puchased book" for IBA or EPUB without DRM and "Book" for PDF files.