Unity Commerical Skybox Usage

Are the skyboxes that Unity gives you allowed for commerical use?

It’s probably in here:

http://unity3d.com/unity/unity-end-user-license-3.x.html

If not, we’ll have to look further. But I can imagine that any resources provided by Unity as an editor packages can be used for commercial use, because the Unity reference is already in your game.