Per-node type copyrights

In my case I want to define copyright by the node type. In particular I want most of my site on a CC license, but I've been duplicating content from the wikipedia which is under GFDL. For wikipedia pages I have a wikipedia content type, and by wikipedia rules the page containing wikipedia content is supposed to be under GFDL.

I can do it using contemplate but I think this is a generic issue. Browsing the list of issues I see several related requests, this one being the most directly related: http://drupal.org/node/136173