yt-dlp/youtube_dlc
Dan Walker 87ab4fb11a Added DRM logic
In the event when there are no available sources due to DRM controlled sources, return a DRM error and don't proceed with trying.

#28 reports that an ExtractorError "No video formats found". Which is true, because the formats list is empty, however it's empty because they are all locked. This provides a more informative message to the end-user.

# TESTING
Tried the URL provided in #28 and confirmed a DRM messages is returned.
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