I'm not a lawyer, and most of my knowledge of copyright law comes from Tom Scott's video on the subject [1], but it's worth noting that it's not universally agreed on that Weird Al's parodies fall under fair use. Again, I am not a lawyer, at best I'm a novice when it comes to copyright law, but what I do know, I agree with what Tom says: I wouldn't expect Weird Al to win if he was taken to court (if he didn't ask permission).[1] https://youtu.be/1Jwo5qc78QU
bombcar|2 years ago
He likely doesn't want to be in front of the Supreme Court someday having to defend the parodic aspect like the famous Barbie Girl case, especially as it is not clear that all of his songs are parodies of the song and not some other aspect in the format of the song.