Code Licenses
If you have been working with code for a while, you’ve probably come across licensing, and terms like “Free as in Speech”, or “Free as in Beer”. What does it all mean?
The BSD 3-Clause License
URL: http://opensource.org/licenses/BSD-3-Clause
GPL
URL: http://www.gnu.org/licenses/gpl.html
The GNU General Public License (or GPL) is a license maintained by the Free Software Foundation.
GPLv3
URL: http://www.gnu.org/licenses/quick-guide-gplv3.html
This is the most recent version of the GPL license (as of July 2013).