The client module needs to be able to access the Licence Master web services to retrieve licence status information. If the Licence Master installation in question is on a internet web server, outgoing internet access should be part of the module's technical requirements.
Remember that a web site / application will not have outgoing internet access only in the most exceptional circumstances. By default, webs on most shared and dedicated hosting solutions will have access. That is also true of many intranet scenarios. In the case of a fully closed intranet, however, the firewall may need to be configured to allow your module to communicate with the Licence Master server.
Note also that in the case that a module is unable to access the Licence Master server, it is the module developer who decides how it should responds.