You can usually remove DRM from a DRM'd PDF using Inept, but converting any PDF can be problematic. When I convert a PDF I use Acrobat (Pro not Reader) to export to HTML and then clean that up in Book Designer. Sometimes that cleanup is easy, sometimes not so much. Then I can use Book Designer to make a LIT or PRC which I convert to EPUB in Calibre (BD will also make an LRF for you). I know others have different methods for converting PDF, but that's what I've found most reliable. If I'm in a hurry I'll sometimes run the PDF through Mobipocket Creator and see if I get decent results. That will make a mobi/prc file I can then convert with Calibre.
If you can't get it in EPUB and your going to remove DRM and convert something else you're much better off buying it in MS Reader (LIT) format or Mobipocket (MOBI/PRC) format and using that as a starting point. ConvertLit and mobidedrm are fairly easy to use and will give you a book Calibre can convert to EPUB or LRF for you in seconds once the DRM is removed.
I'm sure others will have other methods to recommend that will work just as well.
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