Hmm. Now let me through my idea regarding this.
Even though a same author post a content in two different sites, the site where he posted the content first will hold the copyright for that Article. This might sound strange, but thats a key thing in copyright rules.
If i post a content in a site, then it doesn't means that its copyrighted to me, on contrary its copyrighted to the admin of that site.
So if you post an article on a particular site, you can't copy the entire article to another site without the permission of the primary site.

It varies with site to site. Maybe you should get it clarified with Raymond, regarding this mrm and Grr.