AFAIK Tunebite can only use speed dubbing for DRM-protected audio files (and your computer should be powerful enough for Tunebite to remove DRM protection faster than in Real Time).

As I mentioned many times, I don't see much sense in removing DRM protection from video files with lossy DRM removal software since such programs hardly add anything that you can't get from screen video capture software. And the latter software allows you to record anything from your screen.