There is a lot of contradiction with CC licenses.
To give you an example, http://opengameart.org/content/the-revolution-snow states
> License(s): CC-BY-SA 3.0
and the original site confirms: https://web.archive.org/web/20140416105 ... leset.html
> All content on this website is licensed under the Creative Commons Attribution-ShareAlike 3.0 Unported
yet at the same it time states:
- This tileset is free to use for all none commercial projects
- Please contact me for commercial use
so what would happen, if anybody uses such (lets dub it "Schrodinger CC") content in a commercial project?
In other words, what would judge decide if author sues, saying that he both allowed and forbade commercial use at the same time? What would take priority?