Much, much more picky than other marketplaces. Much, much cheaper than Hans Zimmer. In fact, it's free for a link.
The icons, sounds, and photos are free for personal use and also free for commercial use, but we require linking to our web site. We distribute them under the license called Creative Commons Attribution-NoDerivs 3.0 Unported. Alternatively, you could buy a license that doesn't require any linking.