Read about it
here.
This is abuse of YouTube's policy. If you take a photo or shoot a video, you own the copyright. And Prince doesn't own the song copyright. Yet his goons claimed a copyright violation and had the videos taken down.
I've never been a fan of Prince's music, but had nothing against the guy. His personal weirdness, well, he's a star, and I don't care if he's eccentric. But I hope Radiohead sues him and teaches him a lesson. And I hope his fans will remember how little he really thinks of them.