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This site is a wiki for dissemination of information of all things related to

copyleft licensing.  The primary project currently on this site is the

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

## What Is Copyleft?

Here are a few sources to read generally what copyleft is:

  * [Richard M. Stallman's essay on copyleft at gnu.org](https://www.gnu.org/copyleft/)

  * [The Wikipedia entry on Copyleft](http://en.wikipedia.org/wiki/Copyleft)