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By design, you can authorize up to 5 computers to sync or use apps, audiobooks, books, music, movies, or other content you've purchased from the iTunes Store. If you try to authorize more than 5 computers, you may receive this message: "You have already authorized 5 computers with this account. To authorized this computer you must first deauthroize one of the other computers"
We may follow this article to deauthorize one computer: How to Authorize Computer in Apple iTune
