The Brizy theme author license doesn't work with unlimited website uses.
You can create and sell a license that includes unlimited website uses for your clients, but you need to make it very clear that they'll also need to purchase an unlimited Brizy PRO license from our website in order for that to work.
Otherwise they only get only one license activated through your author licensing system and this goes against unlimited website use :)
Once they purchase an unlimited Brizy PRO license from our website, they'll get access to a licensing system that will let them create and manage Brizy PRO licenses.