When youtube-dl requires authentication when download YouTube video

[Khang-NT]

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Seem like youtube-dl always does "login" in init phase with all videos if user specify "username" and "password" parameter.

    def _real_initialize(self):
        if self._downloader is None:
            return
        self._set_language()
        if not self._login():
            return

Usually it is not necessary with public youtube video and no age restriction.
My question is which YouTube video requires authentication? Could "youtube-dl" only login when in forced situation?
Login many times can move us into bad situation like: blocking or "security notice" requires sms verify.

I integrated youtube-dl to my system which makes ~ 100.000 requests per day, so login 100.000 times is impossible.

youtube-dl is awesome project, thanks your team!

[dstftw]

Use --cookies instead of providing credentials.