Various nations have different rules re copyright.  YouTube uses U.S.
rules, which are among the longest copyright protection rules in the
world.  For example, music published since 1923 is still under copyright
no matter when the composer died, which is why some sites do not make
available MIDI files of piano rolls they have scanned unless the roll
was cut and released before 1923.

Canada is still using the 50-year rule for most copyright issues, but
that is 50 years after publication or death of the author, whichever
is later, if memory serves.

Germany may well be at 70 years, and I have no idea what rule the EU
has put in place covering that group of nations.  China has a completely
different set of rules, and I would not want to guess what the rules
are in Uganda, Syria, Ivory Coast, and so on.

So, if you are not in the U.S., feel free to point that out to YouTube
and to point out that you are subject to the copyright rules of your
nation, _not_ the U.S. rules.

R. S. (Bob) Heuman