To check if a book is TOPAZ or AZW (mobi/prc), download book's sample and open it with Notepad. If first 3 letters are "TPZ" then it's TOPAZ and you can't remove the DRM protection.
If it's AZW there are tools to remove the DRM (which might legal or illegal depedning on where you live.)
If the book is in TOPAZ format then you might try making screenshots out of it. You can automate it with
http://www.autohotkey.com/ macro player and a screencapture program like SnagIt.