Long story short, I was trying to buy I am Number Four as iBooks for my class set of iPads through iTunes. I thought I was being all legal and whatnot by trying to buy 17 copies. As it turns out, you only have to buy 1 copy per account and you can share it with ALL devices under the same account [Verified by speaking to an Apple rep on the phone]. Whoopee!! This means in a school setting, if all iPads/iPod Touches etc. were under the same account (even if it’s 100s) they could all have the same ebook (and audiobook and movie). Wow! Thank you, Apple. Once again, I bow to you.