The UPNP monitor is covered by the Apache License v 2 (see APACHEV2). 

This project uses the cling library and its dependencies for its UPNP functionality. 
See clings project web site: http://4thline.org/projects/cling/ from which source code can be obtained. 
The cling project is covered by the LGPL license, see LGPL

The source code of the upnp monitor is accessible through git at https://wamblee.org/git/public/upnpmonitor