You can reasonably expect that configuration data would be completely separate from the app it is configuring, and could release it under any license. The only way I can see that their license would carry over would be if you were shipping parts of their codebase with your customizations.
Think about it this way: if what you are shipping is just an arbitrary stream of data that contains no proprietary work, then it stands alone.
Of course IANAL and there maybe some ridiculous law that covers configuration data, but I'm not aware of such a thing. (Waiting for people to pull out all the legal precedent that I am missing, Cunningham law and all.)