YouTube Pocket uses separate command-line executables:

yt-dlp: https://github.com/yt-dlp/yt-dlp
License and bundled dependency notices: https://github.com/yt-dlp/yt-dlp/blob/master/LICENSE
Source/releases: https://github.com/yt-dlp/yt-dlp/releases
The Windows executable bundles dependencies under their respective licenses.

Deno: https://github.com/denoland/deno
MIT license: https://github.com/denoland/deno/blob/main/LICENSE.md
Source/releases: https://github.com/denoland/deno/releases

FFmpeg: https://ffmpeg.org/
Windows build: https://www.gyan.dev/ffmpeg/builds/
GPL v3 build; bundled license is tools/FFmpeg-LICENSE.txt.
Build source and dependencies: https://www.gyan.dev/ffmpeg/builds/#libraries
Source: https://github.com/FFmpeg/FFmpeg

These binaries are bundled for the requesting user's personal use.
If redistributing this folder, review all upstream license and corresponding-source obligations.
