After buying our software you receive your license key via e-mail (please check your SPAM, if you don't receive it promptly) 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.
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.