>> whether or not it is a clean-room reverse-engineered code, like Wine/ReactOS > No. Not clean room, not chinese wall. If it's not clean room, then there's probably copyright violations. For reference: https://en.wikipedia.org/wiki/Clean_room_design Also, offering commercial licensing? That's a good way to get a lot worse than just a DMCA takedown.
This is the law in the United States. From the links given in the readme file the authors are probably from Russia.