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REDUCE - Open Source release July 2013, then February 2014 Tiny updates to this file just to try to keep the credits to other projects that are used up to date. As of Feb 2014 the revision number at Sourceforge is 2337, and this seems to correspond to an average activity rate of a bit over 3 checkins per day. December 2010 This project just reached revision 1000 in the Sourceforge subversion repository. This feels like something of a landmark. March 2009 This is the REDUCE algebra system, which was originally developed by Tony Hearn. A bibliography somewhere in this tree reports some of the large numbers of papers that have been written about or relying on REDUCE. Arthur Norman. March 2009 The BULK of the files in this tree are subject to the (modified) BSD license, as shown below. There are some components that are subject to more restrictive terms (notably the FOX GUI Toolkit, used in one version of the code here, is under LGPL). =========================================================================== Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: * Redistributions of source code must retain the relevant copyright notice, this list of conditions and the following disclaimer. * 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 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 OWNERS 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. =========================================================================== The CSL version of Reduce has started to migrate to use the wxWidgets library rather than FOX (see below). wxWidgets is under its own license which is LGPL 2 (or later) plus some permissive exceptions for the distribution of applications linked against the library. A full archive is wxWidgets source is included and that contains full details. Note that the directory csl/fox contains a modified version of the FOX toolkit (www.fox-toolkit.com) version 1.6 which is subject to LGPL 2.1. Note explicitly that while an unmodified version of FOX can be linked into an application and the resulting version may be distributed without hindrance even the smallest change that has not been accepted by the FOX central site can only be used under the terms of the LGPL. Within the FOX directory the "utils" subdirectory contains a program reswrap.cpp that is used while building FOX. I do not see any cause for anybody to even want to distribute a binary of that, but to satisfy the GPL better I have put a copy of the GPL in the directory with it. No part of reswrap itself ends up in the main programs built here, and its status is thus rather like that of gcc and other tools. The FOX test programs were originally held within the FOX directory, but they are subject to the GPL not the LGPL or any more benign license. I have moved them to a separate directory to make it unambiguous that there are at most here as mere aggregation, and the standard build sequences here make even the presence of that directory optional. I do not intend to provide or distribute binary copies of any of them ever, and so there should not be any complications at all on that front. The "gnuplot" package is used with REDUCE and its license indicates that it may be redistributed freely, but that modified versions may only be circulated in the form of patch files against the official release. The version included here is an original un-modified copy. Well actually right now there is no version included with Reduce. This is because Sourceforge policy is that if we include any binary then we must also put the corresponding source into the Sourceforge Release system. Putting a copy of a snapshot of the gnuplot source there seems both clumsy and asks for confusion as and when gnuplot gets updated, so this area is under review! The CSL source directory contains material derived from Adobe font metrics, and these metrics it works can be found on many sites - they can be downloaded directly from Adobe's ftp site but also they are included with many existing software packages in forms that clearly state that they are available for redistribution and that the authors of those packages have checked license conditions carefully. The set of files I use here came with "teTeX 2" where these terms are carefully set out and where the package is very well established and widely used so there would have been plenty of opportunity for concerns about rights to be aired. I have not altered the metric files at all. There is a copy of the "distorm" x86 disassembler, which originated from Gil Dabah and licensed under the modified BSD license. See http://ragestorm.net/distorm. I use adjusted versions of Computer Modern Fonts derived from the Blue Sky Research and Y&Y inc versions but which are now freely available for general use. Their copyright is held by the American Mathematical Society, and the versions here should yield exactly the same font metrics as the original versions. The Truetype-format fonts are from the BaKoMa Computer Modern Font collection as distributed via "ctan", and the associated permissive license is included in the directory where they are held. This set of files and its associated .tfm metrics are gradually replacing my use of other font data. An implementation of the MD5 message digest is due to Eric Young and comes from an implementation of SSL, and is subject to what is in essence the modified BSD license. The original and full version of the license terms is included where that code is incorporated. Various other parts within CSL were contributed by NAG Ltd and by various students and others, including J O'Connell, M O Seymour, but were made available to me and to Codemist for inclusion within CSL. The files in the "psl" directory come from ZIB and are some of the ones that they used with the Reduce Development System. As shown there these are also under a BSD license - see the HP_disclaimer.txt that confirms a release from one of the earlier major copyright holders. crlibm is a "correctly rounded maths library" subject to LGPL 2.1. It was fetched from http://lipforge.ens-lyon.fr/www/crlibm/ but needed (minor) aljustment to let it build here. The Latin Modern Fonts and Latin Moder Math Fonts are from http://www.gust.org.pl/projects/e-foundry and copies of the original archives containing them are in csl/support-packages along with unpacked a copy of the GUST-FONT-LICENSE.txt file and relevant README files. There are two uses of derived works, and the GUST License (which is an instance of the Latex Project Public License) requires that an explanation of what is covered and what changes are made is placed in a prominent place (eg here!). In csl/cslbase/wxfonts there are re-packed font files. Merely placing the files in a tree that is distinct from the .zip file that formed the original distribution makes this a derived (and changed) work. But I have also needed to (use fontforge to) convert each .oft file so I also have a .ttf version since my Windows code appeared not to render glyphs from the .otf versions. This should not alter character shapes or metrics but may degrade rendering. I have also extracted from these fonts a series of bitmaps that record which characters are present in the fonts. This is done because I was not instantly able to do this at the point of rendering, and because it then helps me use font substitution for any missing characters. In use these fonts will be set up as application- specific private fonts rather than as globally and permenantly installed ones, so the chances of causing confusion for other software ought to be low. The font directories that are to be distributed as part of a binary release of the software contain READE files etc alongside the actual fonts, and executable software will respond to a "--help" option by displaying a message that contains a brief citation of the fonts and how to recover original official versions. I believe that since I have not changed font shapes, metrics or coverage and since the distribution is not set up to make the fonts available generally - just to have them used as application-private resources - that renamking the fonts (to avoid confusion) is not necessary here. But it is important to record that the fonts and derived information are NOT subject to the full permissions of the BSD License and that any use that envisages moving them away from the code here or altering the messages about them that "--help" displays needs to be done only after careful review of the actual licenses. A C Norman (acn1@cam.ac.uk)
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