Copyright 2012-2014 Sandia Corporation. Under the terms of Contract
DE-AC04-94AL85000 with Sandia Corporation, the U.S. Government retains certain
rights in this software.

Copyright 2014-2016 VeriSign, Inc.

Copyright 2016-2021 Casey Deccio.

DNSViz is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

DNSViz 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.

You should have received a copy of the GNU General Public License along
with DNSViz.  If not, see <http://www.gnu.org/licenses/>.