Thanks to all people that contributed  to this discussion,
which turned out to be interesting, definitely not something which I expected 
at the beginning.

To avoid verbosity, I restrict myself to two more points.

(1) In case one adopts the indication that all the authors of a portion of code 
(irrespective of the extension, even in other languages)  are "of course now 
also copyright holders and authors", how should this be translated  in the 
nomenclature of Writing R Extensions (Section 1.1.1 The DESCRIPTION file)?  In 
this view, "ctb" is the more appropriate role, I believe. The "aut" label is 
not the right option. Otherwise, dozens on CRAN packages where "ctb" is 
extensively used should be amended.

(2) Having read pertaining portions of manuals and pondered messages, I have 
come to the conclusion that the terminology set up in the above-quoted 
paragraph of "Writing R Extensions" is not always ideal. This issue would take 
a long time and space, so I only indicate one point: the role ‘"cre"’ (creator) 
for the package maintainer. There are many cases where this description does 
not fit. For instance, I have seen packages where an author has designed the 
package, written the entire code and documentation alone, maintained the 
package for some years, and then passed on the mere maintenance to somebody 
else; definitely, I would not describe the second person as the "creator". 

> 
> 
> So, I think the safe way is to include the original authors in the author 
> list (and check their license carefully).

In  general, "check the license" is a very sensible indication. In the specific 
case, the Matlab code comes with no licence indication - nothing.

I have now submitted mnormt_2.0.0.tar.gz to CRAN, with a comment/query about 
this issue.  Let us see what "The CRAN" says. In case you want see the 
conclusion, the outcome should appear at 
https://cran.r-project.org/package=mnormt in a few days.

Best regards,

Adelchi Azzalini
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