[brigade]

Not a login token, but rather an attestation token. Presumably TV clients don't really have a good mechanism for attestation that isn't tied to DRM (web technically doesn't either, but the web code can be updated daily...)

[nyx]

Good spot, thanks... I'm reading up, more info here: https://github.com/yt-dlp/yt-dlp/wiki/PO-Token-Guide