Make sure to keep David Cridland's license and copyright.

sleekxmpp/thirdparty/suelta/LICENSE

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+This software is subject to "The MIT License"
+
+Copyright 2007-2010 David Alan Cridland
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

sleekxmpp/thirdparty/suelta/PLAYING-NICELY

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+Hi.
+
+This is a short note explaining the license in non-legally-binding terms, and
+describing how I hope to see people work with the licensing.
+
+First off, the license is permissive, and more or less allows you to do
+anything, as long as you leave my credit and copyright intact.
+
+You can, and are very much welcome to, include this in commercial works, and
+in code that has tightly controlled distribution, as well as open-source.
+
+If it doesn't work - and I have no doubt that there are bugs - then this is
+largely your problem.
+
+If you do find a bug, though, do let me know - although you don't have to.
+
+And if you fix it, I'd greatly appreciate a patch, too. Please give me a
+licensing statement, and a copyright statement, along with your patch.
+
+Similarly, any enhancements are welcome, and also will need copyright and
+licensing. Please stick to a license which is compatible with the MIT license,
+and consider assignment (as required) to me to simplify licensing. (Public
+domain does not exist in the UK, sorry).
+
+Thanks,
+
+Dave.

sleekxmpp/thirdparty/suelta/README

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+Suelta - A pure-Python SASL client library
+
+Suelta is a SASL library, providing you with authentication and in some cases
+security layers.
+
+It supports a wide range of typical SASL mechanisms, including the MTI for
+all known protocols.
+