Template:Licenses/en

The following come from Installer.php :

License	File	URL
Public domain (PD)	public-domain.png	https://creativecommons.org/licenses/publicdomain/
Creative Commons 0 (CC0)	cc-0.png	https://creativecommons.org/publicdomain/zero/1.0/
Creative Commons Attribution 3.0 Unported (CC BY 3.0)	cc-by.png	https://creativecommons.org/licenses/by/3.0/
Creative Commons Attribution-ShareAlike 3.0 Unported (CC BY-SA 3.0)	cc-by-sa.png	https://creativecommons.org/licenses/by-sa/3.0/
Creative Commons Attribution-NonCommercial 3.0 Unported (CC BY-NC-SA 3.0)	cc-by-nc-sa.png	https://creativecommons.org/licenses/by-nc-sa/3.0/
GNU Free Documentation License (GFDL)	gnu-fdl.png	https://www.gnu.org/copyleft/fdl.html