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## What is Copyleft?

Copyleft is a strategy of utilizing copyright law to pursue the policy goal

of fostering and encouraging the equal and inalienable right to copy, share,

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](http://www.gnu.org/copyleft/gpl.html) and the

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

## 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