Licensing Scheme for Publishing IOS Apps

If I build an game using Unity and field it as an IOS app (I am an IOS App Developer), what is the licensing scheme. Are there some Royalties I have to pay or am I free to field my app as an IOS app.

Also, I would be very interested in a link that show how we can write and publish a unity game in an IOS app.

http://unity3d.com/unity/faq