Scharlo, this article is a bit dramatic but it explains the situation. Essentially, Apple wants 30% of sales and subscriptions made outside of the app as well. So if you have your estore on an Android device, you wouldn't be able to carry purchased content over to a iPhone version of that same app. Or if you purchased the item through the app creators website. It would be nice if you bought a physical subscription to a magazine, then you could also have an iPad version for free. But I guess with these new rules that impossible unless the developer gives up an extra 30%.