Content license

As being an active member or bot Wikipedia and OpenStreetMap, possibly the two largest open content projects in the world it is obvious that I come up with the content licensing terms of OpiWiki.

Right now - as far as I (don't) see it - licensing is undefined which - by law - results defaulting to full copyright which is extremely unfortunate.
As a license I would prefer an established open content license (my advice is CreativeCommons Attribution or Attribution-ShareAlike), apart from the website icons and graphical elements.

To help this there should be an easy and obvious way to link to a given content or graph which would satisfy attribution requirements (as far as I see that's already done, just mentioning it).