iTunesArtwork图片：每次都需要这个，还是只需要Ad-hoc分发案例？

I am not surfe if I really need every time this 512 x 512 Pixel Icon, since I don't plan to use Ad-hoc distribution. If I get it right, Ad-hoc distribution is the case when you make an App that is supposed to go only on a very few company iPhones, and you dont want anyone to get that app. If that's true, I choose the other distribution type where anyone can get the app. Would I need that image in that case?I am not surfe if I really need every time this