Legal: Add public domain dedication from Paul Swartz ("z3p")

Thanks, Paul!

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+From dlitz@dlitz.net Sun Aug  2 21:48:25 2009
+Date: Sun, 2 Aug 2009 21:48:25 -0400
+From: "Dwayne C. Litzenberger" <dlitz@dlitz.net>
+To: Paul Swartz <paulswartz@gmail.com>
+Subject: PyCrypto license clarification
+Message-ID: <20090803014825.GA1326@rivest.dlitz.net>
+MIME-Version: 1.0
+Content-Type: text/plain; charset=us-ascii; format=flowed
+Content-Disposition: inline
+User-Agent: Mutt/1.5.16 (2007-06-11)
+Status: RO
+Content-Length: 2631
+
+Hi Paul,
+
+I am the new maintainer of the Python Cryptography Toolkit, and I am
+working on a new release at http://www.pycrypto.org/.
+
+People often ask me what license PyCrypto is covered by, if it's
+GPL-compatible, etc.  Right now, I'm not really sure what to tell them.
+The text in the current LICENSE file (quoted below) is not entirely clear
+on the point of whether distributing modified versions is allowed.  (It
+says "distribute and use", but not "modify".)
+
+   ===================================================================
+   Distribute and use freely; there are no restrictions on further
+   dissemination and usage except those imposed by the laws of your
+   country of residence.  This software is provided "as is" without
+   warranty of fitness for use or suitability for any purpose, express
+   or implied. Use at your own risk or not at all.
+   ===================================================================
+
+   Incorporating the code into commercial products is permitted; you do
+   not have to make source available or contribute your changes back
+   (though that would be nice).
+
+   --amk                                                    (www.amk.ca)
+
+For the next PyCrypto release, I would like to take steps to move toward a
+clearer licensing regime.  I am asking as many copyright holders as I can
+find if I can release PyCrypto under something clearer and more standard.
+Below, I have quoted a public domain dedication that was recommended in
+_Intellectual Property and Open Source: A Practical Guide to Protecting
+Code_, by Van Lindberg.  I have already contacted A. M. Kuchling, Robey
+Pointer, Barry Warsaw, Wim Lewis, Jeethu Rao, Joris Bontje, and Mark 
+Moraes, and they have all approved the following dedication for their 
+contributions.
+
+I understand that you have made contributions to PyCrypto, under nickname 
+"z3p" and/or other names.  May I, on your behalf, dedicate to the public 
+domain all your contributions to PyCrypto, with the following notice?
+
+   =======================================================================
+   The contents of this file are dedicated to the public domain.  To the
+   extent that dedication to the public domain is not available, everyone
+   is granted a worldwide, perpetual, royalty-free, non-exclusive license
+   to exercise all rights associated with the contents of this file for
+   any purpose whatsoever.  No rights are reserved.
+   =======================================================================
+
+Regards,
+  - Dwayne
+
+--
+Dwayne C. Litzenberger <dlitz@dlitz.net>
+   Key-signing key   - 19E1 1FE8 B3CF F273 ED17  4A24 928C EC13 39C2 5CF7
+
+From paulswartz@gmail.com Mon Aug  3 12:14:07 2009
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+In-Reply-To: <20090803014825.GA1326@rivest.dlitz.net>
+References: <20090803014825.GA1326@rivest.dlitz.net>
+From: Paul Swartz <paulswartz@gmail.com>
+Date: Mon, 3 Aug 2009 12:13:43 -0400
+Message-ID: <324cfb540908030913x71d331f0kb069052f74e5ae6b@mail.gmail.com>
+Subject: Re: PyCrypto license clarification
+To: "Dwayne C. Litzenberger" <dlitz@dlitz.net>
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: quoted-printable
+Status: RO
+X-Status: A
+Content-Length: 1450
+
+On Sun, Aug 2, 2009 at 9:48 PM, Dwayne C. Litzenberger<dlitz@dlitz.net> wro=
+te:
+> Hi Paul,
+>
+> I am the new maintainer of the Python Cryptography Toolkit, and I am
+> working on a new release at http://www.pycrypto.org/.
+
+That's great!
+
+> I understand that you have made contributions to PyCrypto, under nickname
+> "z3p" and/or other names. =C2=A0May I, on your behalf, dedicate to the pu=
+blic
+> domain all your contributions to PyCrypto, with the following notice?
+>
+> =C2=A0=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
+=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
+=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
+> =C2=A0The contents of this file are dedicated to the public domain. =C2=
+=A0To the
+> =C2=A0extent that dedication to the public domain is not available, every=
+one
+> =C2=A0is granted a worldwide, perpetual, royalty-free, non-exclusive lice=
+nse
+> =C2=A0to exercise all rights associated with the contents of this file fo=
+r
+> =C2=A0any purpose whatsoever. =C2=A0No rights are reserved.
+> =C2=A0=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
+=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
+=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
+
+Yes, that's fine.  Good luck with the new release!
+
+-p
+--=20
+Paul Swartz
+paulswartz at gmail dot com
+http://paulswartz.net/
+AIM: z3penguin
+
+
+From dlitz@dlitz.net Mon Aug  3 14:35:01 2009
+Date: Mon, 3 Aug 2009 14:35:01 -0400
+From: "Dwayne C. Litzenberger" <dlitz@dlitz.net>
+To: Paul Swartz <paulswartz@gmail.com>
+Subject: Re: PyCrypto license clarification
+Message-ID: <20090803183501.GA17472@rivest.dlitz.net>
+References: <20090803014825.GA1326@rivest.dlitz.net> <324cfb540908030913x71d331f0kb069052f74e5ae6b@mail.gmail.com>
+MIME-Version: 1.0
+Content-Type: text/plain; charset=iso-8859-1; format=flowed
+Content-Disposition: inline
+Content-Transfer-Encoding: 8bit
+In-Reply-To: <324cfb540908030913x71d331f0kb069052f74e5ae6b@mail.gmail.com>
+X-Primary-Address: dlitz@dlitz.net
+X-Homepage: http://www.dlitz.net/
+X-OpenPGP: url=http://www.dlitz.net/go/gpgkey/;
+	id=19E11FE8B3CFF273ED174A24928CEC1339C25CF7 (only for key signing);
+	preference=unprotected
+X-OpenPGP: url=http://www.dlitz.net/go/gpgkey/;
+	id=4B2AFD82FC7D9E3838D9179F1C11B877E7804B45 (2008);
+	preference=signencrypt
+User-Agent: Mutt/1.5.16 (2007-06-11)
+Status: RO
+Content-Length: 1250
+
+On Mon, Aug 03, 2009 at 12:13:43PM -0400, Paul Swartz wrote:
+>On Sun, Aug 2, 2009 at 9:48 PM, Dwayne C. Litzenberger<dlitz@dlitz.net> wrote:
+>> Hi Paul,
+>>
+>> I am the new maintainer of the Python Cryptography Toolkit, and I am
+>> working on a new release at http://www.pycrypto.org/.
+>
+>That's great!
+>
+>> I understand that you have made contributions to PyCrypto, under nickname
+>> "z3p" and/or other names.  May I, on your behalf, dedicate to the public
+>> domain all your contributions to PyCrypto, with the following notice?
+>>
+>>  =======================================================================
+>>  The contents of this file are dedicated to the public domain.  To the
+>>  extent that dedication to the public domain is not available, everyone
+>>  is granted a worldwide, perpetual, royalty-free, non-exclusive license
+>>  to exercise all rights associated with the contents of this file for
+>>  any purpose whatsoever.  No rights are reserved.
+>>  =======================================================================
+>
+>Yes, that's fine.  Good luck with the new release!
+
+Perfect!  Thanks for the quick response!
+
+-- 
+Dwayne C. Litzenberger <dlitz@dlitz.net>
+  Key-signing key   - 19E1 1FE8 B3CF F273 ED17  4A24 928C EC13 39C2 5CF7
+