I have had a similar problem with a couple of books. I found that when I unzipped them, they had a huge .css file. When I opened that I found thousands of classes defined, mostly identical. It was a pretty bad conversion, and not much I could do. (except try a different brand of reader...) A 13MB epub is pretty huge, it may have a lot of pictures or embedded fonts. (It should not be a malformed epub file, but it is possible.) I'm not sure exactly what makes it choke.
The files I looked at did not have DRM, of course, or I couldn't have looked at them. I think they were from BooksOnBoard, but I'm not sure.
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