GitHub has reversed the takedown notice previously processed and published at:
https://github.com/github/dmca/blob/master/2020/10/2020-10-23-RIAA.md
The parent repository made changes in response to the takedown notice and based on the letter shown below GitHub has determined that the notice does not meet the requirements of their DMCA Takedown Policy.
Accordingly, GitHub has decided to reject this notice with respect to the parent repository and they have reinstated that repository:
https://github.com/ytdl-org/youtube-dl
https://resources.hackgence.com/0:/Documents/2020-11-16-RIAA-reversal-effletter.pdf