Hi Benoît,
minidlna-1.0.25+dfsg/debian/copyright :
| Source: http://sourceforge.net/projects/minidlna/files/
| The icons.c file in the original tarball contained binary blobs of possibly
| unfree images. It has hence been replaced in the DFSG tarball by a file
| containing the free Debian logo instead. It can be generated from the SVG logo
| using the debian/make_icons.sh script (see the header of that file for
| instructions).
http://www.debian.org/doc/manuals/developers-reference/best-pkging-practices.html#bpp-origtargz
| A repackaged .orig.tar.{gz,bz2,xz} should not contain any file that does not
| come from the upstream author(s), or whose contents has been changed by you.
So removing files is OK, adding/replacing files not.
Regards,
Bart Martens