Well, maybe no one can legally redistribute it in entirety but they are completely wrong if they are saying no one can use any audio or video. It's called fair use
"CNN has implemented insanely strict measures for the first 2024 presidential debate, effectively banning citizen journalists and independent coverage. No one can use any video or audio from the debate without explicit permission." says Mario Nawfal on Twitter.
Would really be a shame if someone hosted the debate live on https://zap.stream and published it as a torrent on https://dtan.xyz afterwards... 😏

Discussion
I don't know the law but if they're serious about enacting on this "rule", they should feel the Streisand effect into the core of their very bodies. I hope they have nightmares about the Streisand effect.