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I can't seem to find a straight answer to this.

Do I have to authorize iOS apps I have purchased on my iOS devices to run on other iOS Devices? For example I have an app that I bought on my iPhone - can I sign into my friends iPad, re-download it, and then sign out (of the iTunes store) and use and update the perfectly? Or do I have to authorize it in some way?

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Apple has worked hard to try to avoid the situation you mentioned. It is a major pain to have apps downloaded from different Apple IDs on one iOS device. For example, someone bought an app for me, but used (obviously) their Apple ID. Anytime I wanted to update that app, they had to enter their Apple ID in. That also meant that clicking "Update all" in the app store didn't really work. I finally got frustrated and bought the app myself.

So the short answer to both of your questions is basically yes. You can download it for a friend, but, anytime they update, you must autenticate for that app. Everything else should work normally.

You mentioned iPhone vs. iPad - as I'm sure you're already aware of, note that the app must be compatible for iPhone and iPad for what you mentioned to work.

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The app is universal. I expected this, but does downloading it (besides update authorization) have any other effects on my account? – Rooz Mahdavian Mar 17 '12 at 3:43
I believe it has no other impact on your account (this has also been my experience). After your Apple ID has the app as a purchase, you should be able to download any app as many times (theoretically) as you please. – bassplayer7 Mar 17 '12 at 3:48
Got it thanks!! – Rooz Mahdavian Mar 17 '12 at 3:50
Happy to help! Please don't forget to accept my answer (question mark box on the upper left corner of my answer) if it answered your question. ;) – bassplayer7 Mar 17 '12 at 3:54

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