Q: my computer is not authorized

For a computer running Mac OS X, move the cursor to the very top of the computer's screen, click on Store in the menu bar, and choose Authorize this Computer.

For a computer running Windows, press the Alt and S keys and choose Authorize this Computer, or click here, follow the instructions, click on Store in the menu bar, and choose Authorize this Computer.

If you consistently get that message when trying to play a small number of songs, and not at other times, they're corrupt and need to be deleted and redownloaded.

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Authorize your computer in iTunes - Apple Support