OK, here is how I understand it. The name of the song, as well as the song itself, is owned and copyrighted. All published music is.
It is owned by the writers, as well as the musicians who participated in creating it.
In this case, UMG is acting on behalf of some or all of the artists who own the rights to this song.
UMG also authorized you to use this music for your video, since you are not selling it. (Some artists will allow NOTHING, but it seems Scorpions are very understanding)
You must agree that UMG has the rights to tell you what you may or may not do with the music you are using, and they have the right to keep statistics about how many times the video is played, how often it is viewed, who adds it as a favorite, etc.
If the account has been removed, then I think it is a mistake, and you sould contact YouTube to find out what has happened, and why.
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