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Microsoft updated the Office 2013 license. You may now transfer the software to another computer that belongs to you, but not more than one time every 90 days (except due to hardware failure, in which case you may transfer sooner). If you transfer the software to another computer, that other computer becomes the "licensed computer." The Office 365 Subscription products work on up to 5 PCs, Macs, and select mobile devices without license transferability limitations.
When you install Office 365, Office 2016, or Office 2013, you might be prompted to enter a 25-character product key, which would look something like this:
Tip: You don't need a product key if you've already installed Office or if you've associated Office with your Microsoft account. Instead, follow the instructions in the Install Office article.