Legal aspect of freedom

All the free software are based not a “make what you want, you are free”.

The free software, and the free culture is based on the laws. So they need licenses to keep in that all thy publish is free. That’s not so easy  and there are a lot of license, with differences, depending of the purpose of the author.

This is a link to a pdg guide of the free license: Guide to Open Content Licenses

I recomend to everyboy interested in the license to read parts of this document, because it explain very well a lot of concepts.

Of course, the document released under a free license:

The Guide to Open Content Licenses is published under a Creative
Commons Attribution-NonCommercial-ShareAlike 2.0 license.
You are free:
* to copy, distribute, display, and perform the work
* to make derivative works
Under the following conditions:
Attribution. You must give the original author credit.
Noncommercial. You may not use this work for commercial
purposes.
Share Alike. If you alter, transform, or build upon this work,
you may distribute the resulting work only under a license
identical to this one.
*
*
For any reuse or distribution, you must make clear to
others the license terms of this work.
Any of these conditions can be waived if you get
permission from the copyright holder.
Your fair use and other rights are in no way affected by the
above.
Full license:
http://creativecommons.org/licenses/by-nc-sa/2.0/legalcode
© copyright 2004 Lawrence Liang, Piet Zwart Institute