Confirm that you want to deauthorize all authorized computers by choosing “Deauthorize All” in iTunes.At the “Account Information” screen scroll down to find the ‘Computer Authorizations’ section and choose “Deauthorize All”.Choose “View My Accounts…” and authenticate with your iTunes account / Apple ID if required.Open iTunes if you have not done so already, and then go to the “Account” menu.Here’s how you deauthorize every computer related to an Apple ID: Afterwards, you can start authorization individually on a per computer basis again. Need to free up all authorization slots for an Apple ID? Need to deauthorize a computer you no longer have access to? You can this approach to deauthorize all computers then.
How to Deauthorize All Computers in iTunes You will then need to manually authorize the computers in iTunes that you want to be able to purchased and downloaded access iTunes data from. Deauthorize All is a broad brush and not specific, it deauthorizes every computer attached to the Apple ID. Remember, you can directly deauthorize a computer in iTunes if you have access to that machine. Typically when a user discovers the existence of iTunes Authorization, it is because a new device or computer is locked out of accessing their own content acquired through iTunes because the iTunes Authorization Limit has been hit at 5, thus requiring the deauthorization process. Quick side note: Many Mac and PC users won’t ever notice anything about iTunes Authorization, and if you haven’t heard of it before then you likely have nothing to concern yourself with. Using “Deauthorize All” will deauthorize every computer attached to the Apple ID from accessing iTunes content, unless or until those computers have been re-authorized again through iTunes.