If you have managed to miss the media frenzy, you might be interested in the case of Paramount v Axanar, in which several areas of infringement are discussed, but in particular the use of the Klingon language. 🙂
Rather than say any more, I shall point you in the direction of TechnoLlama, aka Dr Andrés Guadamuz, Senior Lecturer in Intellectual Property Law and an international consultant for the World Intellectual Property Organization. His comprehensive post “Can you copyright the Klingon Language?” can be found here.
French speakers interested in all things Star Trek might be interested in this post about the prize-winning book “Le droit selon Star Trek” published last year.