There are different levels of copyright violation. Use of any film clip is a clear violation of statutory copyright, unless you are writing a critique of it, or creating a parody... even then, use if limited. Period. No wiggle room. Uniforms would also fall under this. On the other hand, a new ship, a new crew... new footage... based on a series whose designs they haven't used in 40 years... a lot iffier. Also, they have less to loose.