/usr/share/doc/fwknop-server/NEWS.Debian.gz is in fwknop-server 2.6.0-2.2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/fwknop-server/../libfko2/NEWS.Debian.gz
/usr/share/doc/fwknop-server/../libfko2/NEWS.Debian.gz