Work is in progress.
The library comes with Apache License 2.0, and is separate from ConceptNet itself, yet it uses some parts of its code. The ConceptNet is available under CC-BY-SA-4.0 license. See here for the list of conditions for using ConceptNet data.
This is the official citation for ConceptNet if you use it in research:
Robyn Speer, Joshua Chin, and Catherine Havasi. 2017. "ConceptNet 5.5: An Open Multilingual Graph of General Knowledge." In proceedings of AAAI 31.