COPYING

dnscrypt-wrapper is modified from dnscrypt-proxy, written by Yecheng Fu
<cofyc.jackson at gmail dot com> and covered by the following licenses:

/*
 * Copyright (c) 2012-2016 Yecheng Fu <cofyc.jackson at gmail dot com>
 *
 * Permission to use, copy, modify, and/or distribute this software for any 
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

====

The externally maintained libraries used by dnscrypt-wrapper are:

  - libevent (http://libevent.org/). 3-clause BSD license.
    See libevent/LICENSE.

  - argparse, See argparse/LICENSE.

  - dns-protocol.h, rfc1035.c, rfc1035.h reuses code from dnsmasq by
    Simon Kelley.