gpl or creative commons

I am a bit confused. According to the xwiki web site, the xwiki software falls under the GPL. However, there is a creative commons license at the bottom of each page created by xwiki. Does this mean the content and data in xwiki falls under the creative commons license? Can I keep the creative commons license on the xwiki specific documents and remove the creative commons license footer on my on content and data? Kudos to all the developers on the xwiki project. Nice job. Sincerely, Carlos Pruitt