Hello Andrew,
Actually the license counting mechanism with GWC is not the as with GDC. With GWC, the license counting is done per browser session and not per user IP.
Here are some links on GWC and GAS documentation about the licensing:
https://4js.com/techdocs/genero/gwc/devel/DocRoot/User/Installation.html#LICENSING_GENEROhttps://4js.com/techdocs/genero/gas/devel/DocRoot/User/AS_Licensing.htmlI hope this will give answer to your questions.
Anyway, if you have more question about licensing, do not hesitate to contact your 4Js support center.
Thank you