This is the Debian prepackaged version of pDNS, the PowerDNS
nameserver.

pDNS can be downloaded from http://www.powerdns.com/

Copyright and license:

    Copyright 2002 PowerDNS.COM BV

    This program is free software; you can redistribute it and/or modify
    it under the terms of version 2 of the GNU General Public License as
    published by the Free Software Foundation.

    Additionally, the license of this program contains a special
    exception which allows to distribute the program in binary form when
    it is linked against OpenSSL.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

On Debian systems, the complete text of the GNU General Public License 
can be found in /usr/share/common-licenses/GPL-2