From the LICENSE file:

B. TERMS AND CONDITIONS FOR ACCESSING OR OTHERWISE USING PYTHON

===============================================================

PYTHON SOFTWARE FOUNDATION LICENSE VERSION 2

--------------------------------------------

1. This LICENSE AGREEMENT is between the Python Software Foundation

("PSF"), and the Individual or Organization ("Licensee") accessing and

otherwise using this software ("Python") in source or binary form and

its associated documentation.

2. Subject to the terms and conditions of this License Agreement, PSF hereby

grants Licensee a nonexclusive, royalty-free, world-wide license to reproduce,

analyze, test, perform and/or display publicly, prepare derivative works,

distribute, and otherwise use Python alone or in any derivative version,

provided, however, that PSF's License Agreement and PSF's notice of copyright,

i.e., "Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,

3. In the event Licensee prepares a derivative work that is based on

or incorporates Python or any part thereof, and wants to make

the derivative work available to others as provided herein, then

Licensee hereby agrees to include in any such work a brief summary of

the changes made to Python.

4. PSF is making Python available to Licensee on an "AS IS"

basis.  PSF MAKES NO REPRESENTATIONS OR WARRANTIES, EXPRESS OR

IMPLIED.  BY WAY OF EXAMPLE, BUT NOT LIMITATION, PSF MAKES NO AND

DISCLAIMS ANY REPRESENTATION OR WARRANTY OF MERCHANTABILITY OR FITNESS

FOR ANY PARTICULAR PURPOSE OR THAT THE USE OF PYTHON WILL NOT

INFRINGE ANY THIRD PARTY RIGHTS.

5. PSF SHALL NOT BE LIABLE TO LICENSEE OR ANY OTHER USERS OF PYTHON

FOR ANY INCIDENTAL, SPECIAL, OR CONSEQUENTIAL DAMAGES OR LOSS AS

A RESULT OF MODIFYING, DISTRIBUTING, OR OTHERWISE USING PYTHON,

OR ANY DERIVATIVE THEREOF, EVEN IF ADVISED OF THE POSSIBILITY THEREOF.

6. This License Agreement will automatically terminate upon a material

breach of its terms and conditions.

7. Nothing in this License Agreement shall be deemed to create any

relationship of agency, partnership, or joint venture between PSF and

Licensee.  This License Agreement does not grant permission to use PSF

trademarks or trade name in a trademark sense to endorse or promote

products or services of Licensee, or any third party.

8. By copying, installing or otherwise using Python, Licensee

agrees to be bound by the terms and conditions of this License

Agreement.

From the Doc/license.rst file:

Licenses and Acknowledgements for Incorporated Software

=======================================================

This section is an incomplete, but growing list of licenses and acknowledgements

for third-party software incorporated in the Python distribution.

Mersenne Twister

----------------

The :mod:`_random` module includes code based on a download from

http://www.math.sci.hiroshima-u.ac.jp/~m-mat/MT/MT2002/emt19937ar.html. The following are

the verbatim comments from the original code::

   A C-program for MT19937, with initialization improved 2002/1/26.

   Coded by Takuji Nishimura and Makoto Matsumoto.

   Before using, initialize the state by using init_genrand(seed)

   or init_by_array(init_key, key_length).

   Copyright (C) 1997 - 2002, Makoto Matsumoto and Takuji Nishimura,

   All rights reserved.

   Redistribution and use in source and binary forms, with or without

   modification, are permitted provided that the following conditions

   are met:

    1. Redistributions of source code must retain the above copyright

       notice, this list of conditions and the following disclaimer.

    2. Redistributions in binary form must reproduce the above copyright

       notice, this list of conditions and the following disclaimer in the

       documentation and/or other materials provided with the distribution.

    3. The names of its contributors may not be used to endorse or promote

       products derived from this software without specific prior written

       permission.

   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

   A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR

   CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

   EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

   PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR

   PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF

   LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING

   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS

   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

   Any feedback is very welcome.

   http://www.math.sci.hiroshima-u.ac.jp/~m-mat/MT/emt.html

   email: m-mat @ math.sci.hiroshima-u.ac.jp (remove space)

Sockets

-------

The :mod:`socket` module uses the functions, :func:`getaddrinfo`, and

:func:`getnameinfo`, which are coded in separate source files from the WIDE

Project, http://www.wide.ad.jp/. ::

   Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.

   All rights reserved.

   Redistribution and use in source and binary forms, with or without

   modification, are permitted provided that the following conditions

   are met:

   1. Redistributions of source code must retain the above copyright

      notice, this list of conditions and the following disclaimer.

   2. Redistributions in binary form must reproduce the above copyright

      notice, this list of conditions and the following disclaimer in the

      documentation and/or other materials provided with the distribution.

   3. Neither the name of the project nor the names of its contributors

      may be used to endorse or promote products derived from this software

      without specific prior written permission.

   THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND

   GAI_ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

   IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

   ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE

   FOR GAI_ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

   DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

   OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

   HOWEVER CAUSED AND ON GAI_ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

   LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN GAI_ANY WAY

   OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

   SUCH DAMAGE.

Floating point exception control

--------------------------------

The source for the :mod:`fpectl` module includes the following notice::

     ---------------------------------------------------------------------

    /                       Copyright (c) 1996.                           \

   |          The Regents of the University of California.                 |

   |                        All rights reserved.                           |

   |                                                                       |

   |   Permission to use, copy, modify, and distribute this software for   |

   |   any purpose without fee is hereby granted, provided that this en-   |

   |   tire notice is included in all copies of any software which is or   |

   |   includes  a  copy  or  modification  of  this software and in all   |

   |   copies of the supporting documentation for such software.           |

   |                                                                       |

   |   This  work was produced at the University of California, Lawrence   |

   |   Livermore National Laboratory under  contract  no.  W-7405-ENG-48   |

   |   between  the  U.S.  Department  of  Energy and The Regents of the   |

   |   University of California for the operation of UC LLNL.              |

   |                                                                       |

   |                              DISCLAIMER                               |

   |                                                                       |

   |   This  software was prepared as an account of work sponsored by an   |

   |   agency of the United States Government. Neither the United States   |

   |   Government  nor the University of California nor any of their em-   |

   |   ployees, makes any warranty, express or implied, or  assumes  any   |

   |   liability  or  responsibility  for the accuracy, completeness, or   |

   |   usefulness of any information,  apparatus,  product,  or  process   |

   |   disclosed,   or  represents  that  its  use  would  not  infringe   |

   |   privately-owned rights. Reference herein to any specific  commer-   |

   |   cial  products,  process,  or  service  by trade name, trademark,   |

   |   manufacturer, or otherwise, does not  necessarily  constitute  or   |

   |   imply  its endorsement, recommendation, or favoring by the United   |

   |   States Government or the University of California. The views  and   |

   |   opinions  of authors expressed herein do not necessarily state or   |

   |   reflect those of the United States Government or  the  University   |

   |   of  California,  and shall not be used for advertising or product   |

    \  endorsement purposes.                                              /

     ---------------------------------------------------------------------

Asynchronous socket services

----------------------------

The :mod:`asynchat` and :mod:`asyncore` modules contain the following notice::

   Copyright 1996 by Sam Rushing

                           All Rights Reserved

   Permission to use, copy, modify, and distribute this software and

   its documentation for any purpose and without fee is hereby

   granted, 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 Sam

   Rushing not be used in advertising or publicity pertaining to

   distribution of the software without specific, written prior

   permission.

   SAM RUSHING DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,

   INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN

   NO EVENT SHALL SAM RUSHING BE LIABLE FOR ANY SPECIAL, INDIRECT OR

   CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS

   OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,

   NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN

   CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

Cookie management

-----------------

The :mod:`http.cookies` module contains the following notice::

   Copyright 2000 by Timothy O'Malley <[email protected]>

                  All Rights Reserved

   Permission to use, copy, modify, and distribute this software

   and its documentation for any purpose and without fee is hereby

   granted, 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

   Timothy O'Malley  not be used in advertising or publicity

   pertaining to distribution of the software without specific, written

   prior permission.

   Timothy O'Malley DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS

   SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY

   AND FITNESS, IN NO EVENT SHALL Timothy O'Malley BE LIABLE FOR

   ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES

   WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,

   WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS

   ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR

   PERFORMANCE OF THIS SOFTWARE.

Execution tracing

-----------------

The :mod:`trace` module contains the following notice::

   portions copyright 2001, Autonomous Zones Industries, Inc., all rights...

   err...  reserved and offered to the public under the terms of the

   Python 2.2 license.

   Author: Zooko O'Whielacronx

   http://zooko.com/

   mailto:[email protected]

   Copyright 2000, Mojam Media, Inc., all rights reserved.

   Author: Skip Montanaro

   Copyright 1999, Bioreason, Inc., all rights reserved.

   Author: Andrew Dalke

   Copyright 1995-1997, Automatrix, Inc., all rights reserved.

   Author: Skip Montanaro

   Copyright 1991-1995, Stichting Mathematisch Centrum, all rights reserved.

   Permission to use, copy, modify, and distribute this Python software and

   its associated documentation for any purpose without fee is hereby

   granted, provided that the above copyright notice appears in all copies,

   and that both that copyright notice and this permission notice appear in

   supporting documentation, and that the name of neither Automatrix,

   Bioreason or Mojam Media be used in advertising or publicity pertaining to

   distribution of the software without specific, written prior permission.

UUencode and UUdecode functions

-------------------------------

The :mod:`uu` module contains the following notice::

   Copyright 1994 by Lance Ellinghouse

   Cathedral City, California Republic, United States of America.

                          All Rights Reserved

   Permission to use, copy, modify, and distribute this software and its

   documentation for any purpose and without fee is hereby granted,

   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 Lance Ellinghouse

   not be used in advertising or publicity pertaining to distribution

   of the software without specific, written prior permission.

   LANCE ELLINGHOUSE DISCLAIMS ALL WARRANTIES WITH REGARD TO

   THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND

   FITNESS, IN NO EVENT SHALL LANCE ELLINGHOUSE CENTRUM BE LIABLE

   FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES

   WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN

   ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT

   OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

   Modified by Jack Jansen, CWI, July 1995:

   - Use binascii module to do the actual line-by-line conversion

     between ascii and binary. This results in a 1000-fold speedup. The C

     version is still 5 times faster, though.

   - Arguments more compliant with Python standard

XML Remote Procedure Calls

--------------------------

The :mod:`xmlrpc.client` module contains the following notice::

       The XML-RPC client interface is

   Copyright (c) 1999-2002 by Secret Labs AB

   Copyright (c) 1999-2002 by Fredrik Lundh

   By obtaining, using, and/or copying this software and/or its

   associated documentation, you agree that you have read, understood,

   and will comply with the following terms and conditions:

   Permission to use, copy, modify, and distribute this software and

   its associated documentation for any purpose and without fee is

   hereby granted, provided that the above copyright notice appears in

   all copies, and that both that copyright notice and this permission

   notice appear in supporting documentation, and that the name of

   Secret Labs AB or the author not be used in advertising or publicity

   pertaining to distribution of the software without specific, written

   prior permission.

   SECRET LABS AB AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD

   TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANT-

   ABILITY AND FITNESS.  IN NO EVENT SHALL SECRET LABS AB OR THE AUTHOR

   BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY

   DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,

   WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS

   ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE

   OF THIS SOFTWARE.

test_epoll

----------

The :mod:`test_epoll` contains the following notice::

  Copyright (c) 2001-2006 Twisted Matrix Laboratories.

  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.

Select kqueue

-------------

The :mod:`select` and contains the following notice for the kqueue interface::

  Copyright (c) 2000 Doug White, 2006 James Knight, 2007 Christian Heimes

  All rights reserved.

  Redistribution and use in source and binary forms, with or without

  modification, are permitted provided that the following conditions

  are met:

  1. Redistributions of source code must retain the above copyright

     notice, this list of conditions and the following disclaimer.

  2. Redistributions in binary form must reproduce the above copyright

     notice, this list of conditions and the following disclaimer in the

     documentation and/or other materials provided with the distribution.

  THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND

  ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

  ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE

  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

  OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

  HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

  LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

  OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

  SUCH DAMAGE.

SipHash24

---------

The file :file:`Python/pyhash.c` contains Marek Majkowski' implementation of

Dan Bernstein's SipHash24 algorithm. The contains the following note::

  <MIT License>

  Copyright (c) 2013  Marek Majkowski <[email protected]>

  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.

  </MIT License>

  Original location:

     https://github.com/majek/csiphash/

  Solution inspired by code from:

     Samuel Neves (supercop/crypto_auth/siphash24/little)

     djb (supercop/crypto_auth/siphash24/little2)

     Jean-Philippe Aumasson (https://131002.net/siphash/siphash24.c)

strtod and dtoa

---------------

The file :file:`Python/dtoa.c`, which supplies C functions dtoa and

strtod for conversion of C doubles to and from strings, is derived

from the file of the same name by David M. Gay, currently available

from http://www.netlib.org/fp/.  The original file, as retrieved on

March 16, 2009, contains the following copyright and licensing

notice::

   /****************************************************************

    *

    * The author of this software is David M. Gay.

    *

    * Copyright (c) 1991, 2000, 2001 by Lucent Technologies.

    *

    * Permission to use, copy, modify, and distribute this software for any

    * purpose without fee is hereby granted, provided that this entire notice

    * is included in all copies of any software which is or includes a copy

    * or modification of this software and in all copies of the supporting

    * documentation for such software.

    *

    * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR IMPLIED

    * WARRANTY.  IN PARTICULAR, NEITHER THE AUTHOR NOR LUCENT MAKES ANY

    * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE MERCHANTABILITY

    * OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR PURPOSE.

    *

    ***************************************************************/

expat

-----

The :mod:`pyexpat` extension is built using an included copy of the expat

sources unless the build is configured ``--with-system-expat``::

  Copyright (c) 1998, 1999, 2000 Thai Open Source Software Center Ltd

                                 and Clark Cooper

  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.

libffi

------

The :mod:`_ctypes` extension is built using an included copy of the libffi

sources unless the build is configured ``--with-system-libffi``::

   Copyright (c) 1996-2008  Red Hat, Inc and others.

   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.

zlib

----