I'm a little bit confused about the license of DokuWiki. Can I use it on a commercial website?

The short answer is yes.

But let's explain it a little bit: in fact there are two licenses. One for the software called DokuWiki and one for the content in the DokuWiki installation at www.dokuwiki.org.

The one that is probably the one you are interested in, is the one for the software. It's the GNU General Public License (or shorter: GPL). This means (simply spoken):

You get some rights:

1. You get the software and the sourcecode
2. You are allowed to use the software in any way you like
3. You are allowed to change the sources to your needs

But you have to accept these terms:

1. There are no guarantees of any kind - if it breaks anything for you then it's your problem. ¹⁾
2. If you want to redistribute the software you need to do this under the terms of the GPL, which means you have to redistribute the full sourcecode (including your modifications) too.
3. You may not redistribute the software and say you wrote it all yourself - but that is pretty obvious anyway isn't it?

The second license applies to all the content which is created here in the DokuWiki at www.dokuwiki.org. It is licensed under the Creative Commons Attribution - ShareAlike license (abbreviation: CC-BY-SA). Again a simple explanation:

Again you get some rights:

1. You may of course read the content
2. You may change the content
3. You may redistribute the content in its original or changed form

If you agree to the terms:

1. If you redistribute you have to do it under the same terms
2. If you redistribute the content you have to say who the original author is - In the case of this wiki it's enough to give the originating URL and name the author as DokuWiki Community

For further information about the licenses see

• Frequently Asked Questions about the GNU GPL
• Creative Commons — learn more