Cadenzas to Mozart KV 216 violin concerto

[juba]

I got from my violin teacher about 60 years ago a set of cadenzas
to the Mozart G major concerto by Bram Eldering.
Eldering, of Dutch origin, was Prof. at the Cologne Musikhochschule.
The copyright is from 1940, Aßmann Verlag Burscheid (does not seem to exist
anymore). Eldering died in 1943 in one of the Cologne bombings.
http://de.wikipedia.org/wiki/Bram_Eldering
The cadenzas are quite decent in my opinion, not as long as
other cadenzas, and the technical difficulties are on the level of those
of the concerto.
I would have to create a composer page which I have no right to, etc. On
the other hand the cadenzas would
fit anyway into the Mozart page of that concerto.
How about the copyright status, and may somebody help me in
supplying the cadenzas into IMSLP?

[cypressdome]

Eldering's published cadenzas would be in the public domain in both Canada (50 years postmortem author) and the European Union (70 years postmortem author) since he died in 1943. Chances are they are also PD in the U.S. for failure to either register the copyright or renew it 28 years later but that can be researched later. The file for the cadenzas would actually be added to the work page for Mozart's Violin Concerto No.3 with Eldering listed as the arranger in the same format that Aulin's and Déjardin's cadenzas are listed there. A composer page for Eldering isn't a requirement since he will be treated as an arranger but a page can be created for him at any time once the cadenzas get uploaded to the site.