Why should you get any grief for selling a videotape? It's your property right? You didn't bust into the Paramount vaults to get them did you? All you're doing is selling your property to another person. How many people get in trouble from Dodge or Ford for selling their used car?
Additionally if you post on YouTube the worst thing that would happen is that you're forced to delete it. No big deal. Besides I've seen tons of Trek related clips and episodes on YouTube. You should be just fine.