pycrypto

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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.

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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). Copyright and licensing of the Python Cryptography Toolkit ("PyCrypto"): 13:51, 2 September 2020 (PDT)13:51, 2 September 2020 (PDT)13:51, 2 September 2020 (PDT)13:51, 2 September 2020 (PDT)13:51, 2 September 2020 (PDT)13:51, 2 September 2020 (PDT)13:51, 2 September 2020 (PDT)13:51, 2 September 2020 (PDT)13:51, 2 September 2020 (PDT)13:51, 2 September 2020 (PDT)13:51, 2 September 2020 (PDT)13:51, 2 September 2020 (PDT)13:51, 2 September 2020 (PDT)13:51, 2 September 2020 (PDT)~~

Previously, the copyright and/or licensing status of the Python Cryptography Toolkit ("PyCrypto") had been somewhat ambiguous. The original intention of Andrew M. Kuchling and other contributors has been to dedicate PyCrypto to the public domain, but that intention was not necessarily made clear in the original disclaimer (see LEGAL/copy/LICENSE.orig).

Additionally, some files within PyCrypto had specified their own licenses that differed from the PyCrypto license itself. For example, the original RIPEMD.c module simply had a copyright statement and warranty disclaimer, without clearly specifying any license terms. (An updated version on the author's website came with a license that contained a GPL-incompatible advertising clause.)

To rectify this situation for PyCrypto 2.1, the following steps have been taken:

1. Obtaining explicit permission from the original contributors to
   dedicate their contributions to the public domain if they have not
   already done so.  (See the "LEGAL/copy/stmts" directory for
   contributors' statements.)

2. Replacing some modules with clearly-licensed code from other
   sources (e.g. the DES and DES3 modules were replaced with new ones
   based on Tom St. Denis's public-domain LibTomCrypt library.)

3. Replacing some modules with code written from scratch (e.g. the
   RIPEMD and Blowfish modules were re-implemented from their
   respective algorithm specifications without reference to the old
   implementations).

4. Removing some modules altogether without replacing them.

To the best of our knowledge, with the exceptions noted below or within the files themselves, the files that constitute PyCrypto are in the public domain. Most are distributed 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.

 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.

Exceptions:

- Portions of HMAC.py and setup.py are derived from Python 2.2, and
  are therefore Copyright (c) 2001, 2002, 2003 Python Software
  Foundation (All Rights Reserved).  They are licensed by the PSF
  under the terms of the Python 2.2 license.  (See the file
  LEGAL/copy/LICENSE.python-2.2 for details.)

- The various GNU autotools (autoconf, automake, aclocal, etc.) are
  used during the build process.  This includes macros from
  autoconf-archive, which are located in the m4/ directory.  As is
  customary, some files from the GNU autotools are included in the
  source tree (in the root directory, and in the build-aux/
  directory).  These files are merely part of the build process, and
  are not included in binary builds of the software.

EXPORT RESTRICTIONS:

Note that the export or re-export of cryptographic software and/or source code may be subject to regulation in your jurisdiction.