[General Public License](http://www.gnu.org/copyleft/gpl.html) and the

[Creative Commons Attribution Share Alike License](http://creativecommons.org/licenses/by-sa/4.0/).

Copyright holders of creative work can unilaterally implement these licenses

for their own works to build communities that collaboratively share and

improve copylefted creative works.

## What is copyleft.org?

copyleft.org is a collaborative project to create and disseminate useful

information, tutorial material, and new policy ideas regarding all forms of

copyleft licensing.

### The Copyleft Guide and Tutorial

The primary project currently on this site is a tutorial book entitled

[*Copyleft and the GNU General Public License: A Comprehensive Guide and Tutorial*](/guide/).

This guide describes the policy motivations for copyleft, presents a detailed analysis of the text of

various copyleft licenses, and gives examples and case studies of copyleft compliance situations.

### Getting Involved

There are various ways to get involved with this project.  The primary

copyleft.org website is a wiki, and we welcome helpful edits and additions.