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Content licensing and legal issues
Any wiki site has to deal with the question of who owns the content created by its user community. At NuMathWiki, the following rules apply:
All content created on public wiki pages is licensed under the

license. This is a common license similar to the one used by
MathOverflow,
Wikipedia, and many other sites. By creating or contributing an edit to such a page, you should know that you are agreeing to have your work be licensed in this way.
Content created on private pages (that is, pages residing within a registered user namespace) is not licensed. All legal rights to its content are held by its respective author(s) as they are by default for any content created anywhere that isn't subject to a copyright license. Note that this remains true for private pages whose permissions have been set to make the page publicly viewable. It also remains true for private pages for which more than one user has edit permissions: for such pages, it is the responsibility of the authors to worry about ownership rights to the content they jointly created.
An important consideration concerns migration of content from a private page to a public page. If the contents of a private page are posted on a public page, they becomes licensed. Therefore any user migrating content in such a way must first ensure that they have the agreement of all authors of the page to have the page content migrated to a public area of the wiki.