GPL
For information on the licensing used by this wiki, see Copyright. For more general information about licensing used by Open Source Ecology, see OSE License for Distributive Economics.
GNU GPL
https://en.wikipedia.org/wiki/GNU_General_Public_License
An important property of the GPL is that it is a copyleft/reciprocal license [1].
There are several versions of the GPL, the latest is GPL 3.0.