Apple iPod nano (6th generation) - Manual (Page 19)

Transferring purchased content to another computer
Content that you purchase in iTunes on one computer can be transferred from iPod nano to an
iTunes library on another computer. The other computer must be authorized to play content from
your iTunes Store account.
Authorize another computer:
Open iTunes on the other computer and choose Store > Authorize This Computer.
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Transfer purchased content to another computer:
1 Open iTunes on the other computer and choose Store > Authorize This Computer.
2 Connect iPod nano to the newly authorized computer.
3 In iTunes, choose File > Transfer Purchases from iPod.
19 Chapter 4 Syncing with iTunes