After buying our software you receive your license key via e-mail. You can then download and activate the software on your computer (it has to have an internet connection to be activated).
The license key works independently - that means you can activate the software from any computer worldwide. That also means you can lend your license key to your colleagues and friends.
However, there are two restrictions: It can only be activated at two computers simultaneously, and you are only allowed to use it at ONE computer at a time.
So make sure people are properly deactivating their sessions in case you are sharing a license key.