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Is there a way obtain a digitized signature over printed name using 'lettre'? I guess not, that would be feature request.

PS: it should be \Nref, not \nref, but it doesn't change the outcome.

Package 'lettre' has two parameters for 'Ref #', that of the recipient, and that the sender:
\begin{lettre}...\vref{xyz} \nref{abc}...\end{lettre} I would like to keep the first field, but hide the second field, so I tried this: \begin{lettre}...\vref{xyz}...\end{lettre} , which did not work (see ...

This file and a few others are missing from /usr/local/texlive/2016/texmf-dist/doc/latex/lettre Re-installing the package does not add the missing file. Is it supposed to be that way (add the files manually)? That's how I found out:
$ pdflatex -v
pdfTeX 3.14159265-2.6-1.40.17 (TeX Live 2016 ...

Why are TexLive's doc files owned by root? Would it be a good idea to chown them to a non root user?

texmf-dist my-mac$ ls -ld doc/
drwxr-xr-x 49 root staff 1666 Aug 24 19:31 doc/

$echo $PWD
/usr/local/texlive/2016/texmf-dist/doc/latex/lettre

$ pdflatex letex1.tex
This is pdfTeX, Version 3 ...