I would just like to point out that this "ebook" is not really free because it is licensed under CC BY-NC-ND; meaning you cannot make derivative works from it.

I would just like to point out that this "ebook" is not really free because it is licensed under CC BY-NC-ND; meaning you cannot make derivative works from it. Eg: If you take the contents of the website and turn it into an epub manually you cannot legally distribute said epub. In fact, the only way you could distribute the contents is by having an identical mirror to the site.