The Parallels End User License Agreement states that you may use one copy of the Software activated by a license key on a single instance owned, leased, or otherwise controlled by you.
The Agreement is available at:
In accordance with the End User License Agreement terms and conditions, a Parallels Desktop for Mac retail license can only be used for activation of Parallels Desktop for Mac on a single Mac machine at a time.
Note: In order to use Parallels Desktop for Mac on several Mac machines, you need to purchase the corresponding number of licenses. If you would like to move Parallels Desktop from one computer to another, you do not need to buy a new key, simply uninstall the software from the Mac it is currently installed on before installing on a new one.
Parallels Desktop for Mac licenses are available at Parallels Online Store: