Quoting crock spot crockspot@gmail.com:
Question: What are the licensing issues related to using Media Wiki in a closed corporate environment? Is there a non-free license one can purchase so that GFDL does not allow the whole world access to proprietary info?
cs
You can use MediaWiki with any license you want. MediaWiki is itself GFDL but things made with MediaWiki are not. If you edited the MediaWiki software the GFDL would inherit to that but not if you write a document with it. A large variety of licenses are used for various projects. The English Wikinews for example uses Creative Commons Attribution 2.5. And Conservapedia uses a unique one http://www.conservapedia.com/Conservapedia:Copyright (I love how even on that page they still feel a need to compare themselves to Wikipedia. They have just a tiny obsession with us it seems). Anyways, the point is that you can use MediaWiki without having to worry about the GFDL.