Use Xabe.FFmpeg with the License Agreement under non-commercial use.
Use YoutubeDLSharp under the BSD 3-Clause License.
Use yt-dlp under the Unlicensed License.
GNU AFFERO GENERAL PUBLIC LICENSE Version 3
This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License along with this program. If not, see https://www.gnu.org/licenses/.