HISTORY AND LICENSE APPENDIX C C.1 History of the software Thanks to the many outside volunteers who have worked under Guido’s direction to make these releases possible. Note: GPL-compatible doesn’t mean that we’re distributing Python under the GPL. All Python licenses, unlike the GPL, let you distribute a modified version without making your changes open source. The GPL-compatible licenses make it possible to combine Python with other software that is released under the GPL; the others don’t. All Python releases are Open Source (see https://opensource.org/ for the Open Source Definition). Historically, most, but not all, Python releases have also been GPL-compatible; the table below summarizes the various releases. In May 2000, Guido and the Python core development team moved to BeOpen.com to form the BeOpen Python- Labs team. In October of the same year, the PythonLabs team moved to Digital Creations (now Zope Corporation; see https://www.zope.org/). In 2001, the Python Software Foundation (PSF, see https://www.python.org/psf/) was formed, a non-profit organization created specifically to own Python-related Intellectual Property. Zope Corporation is a sponsoring member of the PSF. In 1995, Guido continued his work on Python at the Corporation for National Research Initiatives (CNRI, see https: //www.cnri.reston.va.us/) in Reston, Virginia where he released several versions of the software. Python was created in the early 1990s by Guido van Rossum at Stichting Mathematisch Centrum (CWI, see https: //www.cwi.nl/) in the Netherlands as a successor of a language called ABC. Guido remains Python’s principal author, although it includes many contributions from others. Release Derived from Year Owner GPL compatible? 0.9.0 thru 1.2 n/a 1991-1995 CWI yes 1.3 thru 1.5.2 1.2 1995-1999 CNRI yes 1.6 1.5.2 2000 CNRI no 2.0 1.6 2000 BeOpen.com no 1.6.1 1.6 2001 CNRI no 2.1 2.0+1.6.1 2001 PSF no 2.0.1 2.0+1.6.1 2001 PSF yes 2.1.1 2.1+2.0.1 2001 PSF yes 2.1.2 2.1.1 2002 PSF yes 2.1.3 2.1.2 2002 PSF yes 2.2 and above 2.1.1 2001-now PSF yes 27