As far as I know, the first published edition (full score) of this work was issued by Schott in 1937. I am assuming that this is an Urtext edition, but since the editor, Georg Schunemann, died in 1945, this should be public domain in any case based on the life + 70 years rule.
Unfortunately, matters may be more complicated than this because Schott renewed the copyright in 1965. I still can't see how this can cause the copyright beyond 2016 (again, life + 70 years), so then the question becomes - what effect does copyright renewal have on the year that a publication enters the public domain?
Schumann Violin Concerto (FPE/Schott) - public domain?
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