I'm trying to host a wiki website which is similar to Wikipedia: all contents licensed under Creative Commons Attribution-ShareAlike License. Besides putting a footnote at each page to explicitly declare the license, what and where should I put the legal language to inform that every contributor must contribute under this same license (and if they do contribute, they automatically agree with it)?
At the bottom of every edit screen on Wikipedia, above the "save page" button, it says:
If you are asking for technical details on how to show that on a MediaWiki installation, that question could probably be better asked at another site. Regardless, on a standard MediaWiki installation, that text may be found and modified at the [[MediaWiki:Copyrightwarning2]] (sometimes [[MediaWiki:Copyrightwarning]]) page of the wiki.