Copyright for djbdns source package in Xenial

This package was debianized by Gerrit Pape  on
Mon,  8 Jan 2001 23:29:43 +0100.

It was downloaded from
 http://cr.yp.to/djbdns/djbdns-1.05.tar.gz

The man-pages in debian/djbdns-man/ were downloaded from
 http://smarden.org/pape/djb/manpages/djbdns-1.05-man-20031023.tar.gz

Upstream Author: D. J. Bernstein 

Copyright:

D. J. Bernstein placed the djbdns package into the public domain.
From http://cr.yp.to/distributors.html
 2007.12.28: I hereby place the djbdns package (in particular,
 djbdns-1.05.tar.gz, with MD5 checksum 3147c5cd56832aa3b41955c7a51cbeb2)
 into the public domain. The package is no longer copyrighted.

The Debian diff is in the public domain.