How to Deauthorize iTunes
It is not possible to use iTunes on a computer unless you authorize the application. After you authorize iTunes, you can use it to sync Apple mobile devices, as well as download, transfer and play digital media. Apple allows all users the ability to authorize a total of five computers with their iTunes account. If you are planning on selling or giving away your computer, it is a good idea to deauthorize iTunes before doing so.
Instructions
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One Computer
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1
Launch iTunes on the computer. Click "Store" on the menu bar.
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2
Select "Deauthorize This Computer" from the drop-down list.
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3
Enter your Apple ID and password in the appropriate boxes, then click "Deauthorize."
All Computers
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4
Launch iTunes. Click "iTunes Store" under "Store" in the left column of the window.
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5
Click your Apple ID in the upper right corner of the window. If you are not signed in to the iTunes Store, click the "Account" button, enter your Apple ID and password and click your Apple ID again.
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6
Enter your password. Click "View Account."
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7
Click the "Deauthorize All" button in the "Account Information" window.
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1
Tips & Warnings
The "Deauthorize All" feature can only be used once a year. If you have fewer than five computers authorized on an iTunes account, or have already used the feature in the last 12 months, the button will not appear.