Currently private wikis need to override the "wikimedia-copyright" message to indicate that the content is not licensed as CC-BY-SA-3.0.
You can see this by going to any private wiki (otrswiki, ombudsmenwiki, stewardwiki) and looking at the message displayed, and what is shown with ?uselang=qqx.
This becomes a problem when no one overrides the message, as is the case at arbcomenwiki: http://arbcom.en.wikipedia.org/wiki/Main_Page which says that content is licensed under a CC-BY-SA license, which probably isnt the case.
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Severity: normal