This is Debian GNU/Linux's prepackaged version of sendip, a program to allow the sending of arbitrary IP packets. This package was put together by Jonathan McDowell It can be obtained from https://github.com/rickettm/SendIP Upstream author: Mike Ricketts Copyright 2000-2016 Mike Ricketts You are free to distribute this software under the terms of the GNU General Public License. The full text of this license can be found in the file /usr/share/common-licenses/GPL-2 The Debian packaging is (C) 2000-2020, Jonathan McDowell and is licensed under the GPLv2, see above.