copyleft.org
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## What is Copyleft?
Copyleft is a strategy of utilizing copyright law to pursue the policy goal
of fostering, encouraging the equal and inalienable right to copy, share,
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/).