I'd use the calibre add on myself and it seems to strip DRM from everything.
"DeDRM plugin for calibre: the simplest option for removing DRM from most ebooks"However I also found this via google:-
"Kindle DRM Removal is a powerful software to remove drm protections from Kindle4PC & Mobipocket Reader with no quality losing. Just remove the AZW/Mobi/PRC/TPZ files drm header, no change on the files. Read the books on iPad, iPhone, iTouch, Sony, Android, Nook, Kobo etc.
What's New: Support Kindle for PC v1.8, v1.9, v1.10."
http://www.epubor.com/kindle-drm-removal.html?331749&gclid=CNvcp5Cxp7cCFc3HtAodkwYAYA