modify and improve creative works of authorship.  Copyleft (as a general

term) describes any method that utilizes the copyright system to achieve the

aforementioned goal.  Copyleft as a concept is usually implemented in the

details of a specific copyright license, such as the GNU

[General Public License (GPL)](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 those 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.

This site itself is licensed under a copyleft license, and has received

contributions from experts around the world.  Thus, copyleft.org is the

premier "meta-project" of copyleft: it's useful copylefted information all

about copyleft itself!

### The Copyleft Guide and Tutorial

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

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.

For the aforementioned guide and tutorial about GPL and other copyleft concepts,

we seek help in the following ways:

#### Proposing Improvements to the Guide

[Merge requests on copyleft.org's gitorious site](https://gitorious.org/copyleft-org/tutorial/merge_requests)

to the Guide are most welcome. If you're looking for something to fix, just

grep the *.tex files for "FIXME" and you'll find plenty.  Many of them are

simple and easy to do.  Some of them are writing, and some of them are

formatting-related.

#### Joining Mailing Lists

   * Subscribe to our low-traffic [announcements-only mailing list](https://lists.copyleft.org/cgi-bin/mailman/listinfo/announce).

   * Join discussion on our [primary mailing list, called "discuss"](https://lists.copyleft.org/cgi-bin/mailman/listinfo/discuss).