I haven't been able to see the comments so I can't give feedback on that, but you should give proper credits to the book's author, Marijn Haverbeke and respect

I haven't been able to see the comments so I can't give feedback on that, but you should give proper credits to the book's author, Marijn Haverbeke and respect his choice of license, http://creativecommons.org/licenses/by-nc/3.0/ http://creativecommons.org/licenses/by-nc/3.0/ (summary) and http://creativecommons.org/licenses/by-nc/3.0/legalcode http://creativecommons.org/licenses/by-nc/3.0/legalcode (full license).