I've changed the license on the Library. We're now under Creative Commons Attribute Non-Commercial Share-alike. What this means is that people can take work on the Library, make derivative works, but must give attribution and cannot use it for commercial work.
Now, if you have something you put up here you later want to use in commercial work, you can do that, with the caveat that it cannot include elements derived from other works on this wiki (including elements of the Library), and as long as it's up here, people can still take it and share it elsewhere, so long as they followed the attribution and non-commercial guidelines.
For example, I could later go on and publish a book about Transitive Norton, which may even include the section currently on the site. However, I wouldn't be able to have him encountering Nigerian Lava Cats, nor would I have him visiting the Library, since that would be derivative of someone else's work. Anyone else would still be free to write their own Transitive Norton story, so long as they credited me and didn't try to charge money for it.