|photo: David Shankbone|
Why no registrations? If you searched copyright records and did not find any registrations for the show, that doesn't mean that the show is not protected. Registration is not a requirement for copyright protection, although it is required for a lawsuit.
Would your use qualify as a fair use? Maybe, but we doubt it. A five minute clip might be considered too long to qualify. In any case, it could prove fairly expensive to find out -- the only way to be positive is to have a court rule on the matter. We'd suggest that you peruse some fair use cases dealing with audio-visual works.