I read much out of copyright material that I have downloaded to my iPad from the University of Adelaide, Project Gutenberg, and other ebook sources. IOS 4.3.1 seems to permit transfer to computer of books, music, and video from the iTunes Store, but not from other sources. I suppose Apple's concern is DRM. Is there any other way to transfer this non-DRM material to my computer for back up? If not, I will simply download it to my Mac from its original source. Thanks for any suggestions you may have.