Legal: Add public domain dedication from Barry A Warsaw

Thanks, Barry!

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+From dlitz@dlitz.net Sat Feb 28 21:45:09 2009
+Date: Sat, 28 Feb 2009 21:45:09 -0500
+From: "Dwayne C. Litzenberger" <dlitz@dlitz.net>
+To: Barry A Warsaw <barry@python.org>
+Subject: PyCrypto license clarification
+Message-ID: <20090301024509.GA13195@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: 2535
+
+Hi Barry,
+
+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, and Wim Lewis, and they have all approved the following dedication 
+for their contributions.
+
+I understand that you have made contributions to PyCrypto.  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 barry@python.org Mon Mar  2 11:29:39 2009
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+Message-Id: <09BF1A39-B015-4820-97A3-8642490C8254@python.org>
+From: Barry Warsaw <barry@python.org>
+To: Dwayne C. Litzenberger <dlitz@dlitz.net>
+In-Reply-To: <20090301024509.GA13195@rivest.dlitz.net>
+Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes
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+Subject: Re: PyCrypto license clarification
+Date: Mon, 2 Mar 2009 11:29:34 -0500
+References: <20090301024509.GA13195@rivest.dlitz.net>
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+
+-----BEGIN PGP SIGNED MESSAGE-----
+Hash: SHA1
+
+On Feb 28, 2009, at 9:45 PM, Dwayne C. Litzenberger wrote:
+
+> I am the new maintainer of the Python Cryptography Toolkit, and I am =20=
+
+> working on a new release at http://www.pycrypto.org/.
+
+Great!  I'm glad to see someone taking up the mantle of this important =20=
+
+Python library.
+
+> I understand that you have made contributions to PyCrypto.  May I, =20
+> on your behalf, dedicate to the public domain all your contributions =20=
+
+> to PyCrypto, with the following notice?
+
+Absolutely yes.
+
+Cheers,
+Barry
+
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