The Avsim library has plenty of Learjets for FSX. You might want to check if someone else has done one with those logo's.. Avsim usually play's by the rules went it comes to copyrights, so if you find one there with those logo's, I would assume you are safe. Which logo are you worried about? I would think if it's just going to be freeware with no money involved, I wouldn't be worried.