In other post I introduced the free software Git, a distributed revision control system with an emphasis on speed.
This time I will talk about the legal aspects of an interesting book about git, “Pro Git” written by Scott Chacon (Ruby developer at GitHub and also the maintainer of the Git website).
The book is published by Apress, and licensed under Creative Commons Attribution-Non Commercial-Share Alike 3.0 license.
This is very interesting because you can buy a printed copy of the book (of course!) but also you can download and share the content of the book from the Pro Git site.
Much more: you can get the sources from the progit project (and translation branches) from ProGit repository at GitHub.
And with the downloaded contents or source, you are free to share (to copy, distribute and transmit the book), and to adapt the content (including translations), if you respect the conditions of: attribute the work, use the contents for non-commercial purpose, and if you modify or translate the content, distribute the resulting work only under the same conditions.
Although the CC-By-NC-SA license is not a free license as explained in the Definition of Free Cultural Works, because of the “Non-Commercial” restriction, I am sure that you will agree with me that it is much better than the traditional “all rights reserved”-copyrighted books. I hope it will be successful for Apress incomes too so they will continue with this practice and who knows, maybe one day this will be the most-used-copyright for, at least, books about free software.