Snapt Aria licenses the Website Accelerator based on active connections.
These are the number of connections active on your server at any point in time.
Active Connections only affect the Standard Snapt Aria Licenses as our Enterprise Licenses are based on Requests/Second.
The limit on the licenses is used mainly as a guideline, if you exceed the value of Active Connections often and certain features of the interface will be disabled, such as reporting, notifications, etc.
Please take into account that if you do go over the limit often that this will not affect your users as no Snapt Aria product ever shuts out your users!