The CEalign module is distributed with ProDy. The ORIGINAL CE method was developed by Ilja Shindyalov and Philip Bourne. The Python version used by ProDy is developed by Jason Vertrees and is available under the new BSD license: from Python 3.8.6, examples, recipes and other codes are doubly conceded in the documentation under the PSF license agreement and the Zero-Clause BSD license. The KDTree biopython pack and the peerwise2 module are distributed with the ProDy package. Biopython is developed by Biopython Consortium and is available under Biopython license: This section is an incomplete but growing list of licenses and confirmations for third-party software built into Python distribution. Some files are explicitly doubly granted under your “Biopython License Agreement” or “BSD 3-Clause License” (both are specified in full below). It is with the intention of proposing all biopythons later as part of this dual licensing approach. Hashlib, posix, ssl, crypt modules use the OpenSSL library for additional performance when provided by the operating system. In addition, Windows and Mac OS X installers for Python may contain a copy of OpenSSL libraries, which is why we are adding a copy of the OpenSSL: The Python Software Foundation (PSFL) license here, a BSD-style license compatible with the GNU General Public License (GPL).  Its main use is the distribution of The Python project software.
Unlike the GPL, the Python license is not a copyleft license and allows the distribution of modified versions without a source code. The PSFL is allowed on both the FSF`s list of licenses and the list of approved OSI licenses. The Python license contains a clause stating that the license is managed by the State of Virginia, United States. The Python Software Foundation license; Python 1.6.1 differs from Python 1.6 only in some minor patches and new license conditions compatible with the GPL. [Citation required] Biopython is currently published under the liberal Biopython License Agreement, but as part of a plan to move to the most commonly used 3-Clause BSD License, some of the code is explicitly doubly conceded under your choice of these two options. For more information, see our license file. Guido van Rossum, the creator of Python, was awarded the 2001 Free Software Foundation award for the Advancement of Free Software for changing the license to address this incompatibility. The Python license is similar to the BSD license and, although it is a free software license, its wording in some versions meant that it was incompatible with the Gnu General Public License (GPL), used by a large amount of free software, including the Linux kernel.