Okay so I just had a look at the FAQ on the website... It says: I WANT TO USE KSP FOR A SCHOOL PROJECT, MUSEUM, OR ANOTHER EDUCATIONAL RELATED AFFAIR, MAY I? Yes, the KSP Team encourages "Space Education", letting us know about it and giving us credit would be greatly appreciated, though. If your project would require you to buy a whole lot of licenses, please Contact us to discuss it. So I guess I will get in contact! Good to know!