The PC license can be activated on any single PC by going to the license key menu
and activating the PC license with the 26 character license key you have been given by your software provider. Note that many times the license key is in an e-mail or on the back of your controller. Once an instance of a license key is activated on one PC, it is not available for use on another PC. If you want to transfer it to another PC, then you must first deactivate it using the same licensing screen. Once deactivated, the license is available for use on another PC. If you want the software available on more than one PC, additional instances of you PC license can be purchased from your software provider.
You must be connected to the internet when activating and deactivating a PC license. Once the license is activated, you do not need an internet connection.
Here a a video demonstrating activating a PC license: