Thread:Project:Support desk/Extensions license/reply (2)

Hello!

The LGPL is compatible with the GPL, see: http://www.gnu.org/licenses/license-list.en.html

Extensions, that uses MediaWiki code (in fact: every MW Extension), which is ditributed, has to be licensed under a GPL compatible license, too. If you can create proprietary extensions, you have to read in the license itself. But one of the main feature of the GPL is, that the source code has to be accessable for everyone, without restrictions. So, if you have a proprietary extension, you have to provide the source code, too :)

That's my knowledge about :)

P.S.: There was an interesting discussion about the license of extensions here: http://www.gossamer-threads.com/lists/wiki/wikitech/384820 (especially for ext, which are deployed on wikimedia wikis).