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+Copyleft.org
+============
+
+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)