authorising a pc

For content other than rented movies, clickhere, follow the instructions, click on Store or Account in the menu bar, and choose Authorize this Computer or Deauthorize this Computer as desired. It isn’t possible to change the computer authorized to play an already-rented movie.

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You can authorize or deauthorize computers right from iTunes! See this link for more detailed information

https://support.apple.com/en-us/HT201251

Let me know if this helped!