I'm going to assume that what you're doing is all legal. But if it's not, know that MR tends to frown on piracy and the like and make future posts with that in mind.
The
NoDRM fork of DeDRM works on Calibre 6.x.
I'm not sure what you mean by 'stopped loading,' but if you mean on import, check Preferences > Adding Books > Reading metadata. Specifically the 'read metadata from file contents...' checkbox.