Q: Is the game “Open Source” now?

A: Open Source refers to the Open Source Initiative’s definition, which the current non-commercial license doesn’t meet. Ideally, once we finish another game and are hopefully able to re-acquire certain rights, we’d like to re-license the U3 SDK under the MIT License.

https://docs.smartlydressedgames.com/en/stable/u3-sdk/faq.html