I'd like to know how I can strip DRM from a Kindle book. I would like to buy a Kindle ebook from Amazon. I'd strip the DRM, and convert it to Epub (so I can listen to it on a headset connected to my iPhone) and to PDF format (so, while listening, I can follow the story in a PDF reader (Okular) using my Ubuntu based distro, and annotate the book).
I have spent an hour searching for software for stripping the DRM but only found links to pages of which the content didn't seem helpful, or which I didn't trust.