You MUST see Seinfeld! Forget those others. Seinfeldisms carry on to this day. :)
As far as copyright. I guess if you bought the copyright it’s yours, no matter if you didn’t make the film.
The only Seinfeld episode I have ever watched all the way through (and I did think it was funny) was the Soup Nazi one...I heard so much about it I found the time to check it out.
There are good reasons to have limits on who can use the fruits of someone else’s labors...If I wrote a song, and it was used by the Obama Campaign...