I have found this program which removes DRM from epub files. It has worked on everything that I have tried it on so far (only 2 files). The demo requires you to shut down and restart for each file which is a hassle. I haven't paid for the full version so I don't know what other options it may have. The site has other programs for other ebook-related actions that I haven't yet tried. If you've been looking for a way to remove the DRM from your ebooks, you may want to give this program a try.
ETA: This program is unfortunately only for Windows.ETA2: I completely missed that the demo version removed pages from the books when it removed the DRM. I apologize for getting up people's hopes.
no subject
ETA: Sure enough, when I paged through one of the books, I came across multiple instances of "Demo Version Limitation" pages. Well, crud.