The GNU General Public License is a free, copyleft license for software and other kinds of works. The licenses for most software and other practical works are designed to take away your freedom to share and change the works …. When we speak of free software, we are referring to freedom, not price. Our General Public Licenses are designed to make sure that you have the freedom to distribute copies of free software (and charge for them if you wish), that you receive source code or can get it if you want it, that you can change the software or use pieces of it in new free programs, and that you know you can do these things.
The OSU photo is copyright Greg Keene and is used with his permission.
The photos of Richard Stallman are made available by Flickr users under a Creative Commons License.
The OSI keyhole logo and the ASF feather logo are trademarks of the Open Source Initiative and the Apache Software Foundation. Use in this presentation is considered fair use according to each organization's logo guidelines.
The St. Laurent book cover was taken as a screenshot from the product description on Amazon.com, 10 October 2011.
Document used by the Open Source Initiative to determine whether or not a particular license can be considered Open Source. Useful for understanding the differences between Free Software and Open Source.