Originally Posted by toonpornblog

That's the idea. You can sell stuff based off of the GPL, but some people really like to twist your tits over it, so it's best to just give them something that will be worthless to them, and keep the rest of your code closed.

If you entirely rebuild the wiki but rewrite it with your own shit, it can get pretty hairy. Look at AutoBlogger Pro. It's technically a 'module', and as such, doesn't have to release it's code as it is hooked into WordPress, but if people bitch enough, they might get edge to release 'how' its hooked into WP, but he doesn't have to give up his own shit..