Hello,
The same license allows using the library on the purchased subdomain (Basic), domain and its subdomains (Advanced and Premium) or a whole IP (Premium), localhost and private networks (classes A, B and C); so you can use the same license on your private networ. If you don't have a public subdomain/domain/IP, you can set localhost as domain to use the library on localhost and private networks. Licenses set to localhost can be changed to other subdomain/domain/IP one time.
Regards.