+ Permission to use, copy, modify, distribute, and sell this software
+ and its documentation for any purpose is hereby granted without fee,
+ provided that the above copyright notice appear in all copies and
+ that both that copyright notice and this permission notice appear in
+ supporting documentation, and that the name of M.I.T. not be used in
+ advertising or publicity pertaining to distribution of the software
+ without specific, written prior permission. M.I.T. makes no
+ representations about the suitability of this software for any
+ purpose. It is provided "as is" without express or implied
+ warranty.
+
+
+md5.[ch]
+--------
+
+Authored by Colin Plumb in 1993. Public domain statement:
+
+ This code implements the MD5 message-digest algorithm.
+ The algorithm is due to Ron Rivest. This code was
+ written by Colin Plumb in 1993, no copyright is claimed.
+ This code is in the public domain; do with it what you wish.
+
+I interpet this as a blanket permision.
+
+
+serpent.c, serpentsboxes.h
+---------------------------
+
+Authored by Ross Anderson, Eli Biham, Lars Knudsen.
+
+Quoting the Serpent web page:
+
+ Serpent is now completely in the public domain, and we impose no
+ restrictions on its use. This was announced on the 21st August at
+ the First AES Candidate Conference. The optimised implementations
+ in the submission package are now under the General Public License
+ (GPL), although some comments in the code still say otherwise. You
+ are welcome to use Serpent for any application. If you do use it,
+ we would appreciate it if you would let us know!
+
+https://www.cl.cam.ac.uk/~rja14/serpent.html
+
+I have indeed corresponded with Ross Anderson about the use of Serpent
+in secnet, and have updated the source comments to reflect the licence
+upgrade.
+
+
+sha1.c
+------
+
+Authored by Steve Reid and modified by James H. Brown,
+Saul Kravitz, and Ian Jackson.
+
+ 100% Public Domain
+
+I interpet this as a blanket permision.
+
+
+sha512.[ch]
+-----------
+
+ Copyright (C) 2005, 2006, 2008, 2009, 2010 Free Software Foundation, Inc.
+
+ This program 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 3 of the License, or
+ (at your option) any later version.
+
+ 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.
+
+ Written by David Madore, considerably copypasting from
+ Scott G. Miller's sha1.c