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- Texsis Copyright, Warranty (lack thereof),
- and Distribution Restrictions
-
-
-License and Distribution
-========================
-
-TeXsis is free software which can be redistributed and/or modified
-under the terms of the LaTeX Project Public License (LPPL), as
-reproduced below. Any reference to "The Program" in the license
-refers to TeXsis and its associated files. A list of the files
-covered by the LPPL is provided in the file called MANIFEST.
-
- Note that TeXsis is based on Plain TeX, not LaTeX, and so the rules
-for naming files with the extensions .ins, .fd, and .cfg do not apply.
-The only special extension used by TeXsis is .txs for style files, and
-these should be treated the same as the other TeXsis source files
-unless a statement in that file says otherwise.
-
-
-COPYRIGHT
-=========
-
-Unless specified otherwise in individual files, TeXsis is Copyright
-1987 1988 1989 1990 1993 1994 1995 1996 1997 1998 1999 2000, 2001 by
-Eric Myers and Frank E. Paige. Other copyrights exist and are noted
-in the individual files that are affected.
-
-
-HISTORY
-=======
-
-Prior to TeXsis version 2.18 the source code to TeXsis was covered by a
-simple copyright declaration and a statement that permission was granted
-to use the software by any member the academic community in conjunction
-with basic research, but that the software could not be used or
-distributed for profit without permission. This was sufficient in the
-1980's when TeXsis was being developed specifically for physics
-researchers, but by the end of the 1990's the issues surrounding software
-licensing had become more developed and we decided that we needed a more
-explicit licensing statement and something a bit more open than just
-"academic use only".
-
- We originally considered the GNU Public License (GPL) and the
-"Lesser" or "Library" version of that license (the LGPL), as well as
-the BSD License, the "Artistic" License, and in fact we looked at most
-of the licences approved by the Open Source Initiative (see
-http://www.opensource.org/licenses/ ). We also considered writing our
-own custom licensing statement, but we eventually decided against
-this. We felt that it was important to choose a well-known license so
-that users would know the basic terms of the license without having to
-read all the details. In the end we found that the LaTeX Project
-Public Licence (LPPL) suited the needs and the spirit of TeXsis most
-closely, and so versions 2.18 of TeXsis and beyond are covered by the
-LPPL, which is reproduced below or can be obtained from the TeXsis
-website.
-
- Please note that the LPPL only applies to the TeXsis source code and
-code derived from it, but it does not apply to TeXsis style files (or
-other files) which were written independently without using TeXsis
-source code. We hope that the authors of style files will choose to
-follow our lead and license their works under the LPPL, but they are
-free to choose whatever license they deem appropriate. Note also that
-under the terms of the LPPL it is possible to add further restrictions
-to a file, as long as they are consistent with the "Conditions on
-individual files" section of the LPPL (see below).
-
- TeXsis has always been an "Open Source" project, and so we chose the
-LPPL as the best way to make TeXsis freely available to everyone but
-protect it from the possible corruption of propagating different
-versions of similar files.
-
-----------------------------------------------------------------------
-
-
-
-LaTeX Project Public License
-============================
-
-LPPL Version 1.0 1999-03-01
-
-Copyright 1999 LaTeX3 Project
- Everyone is permitted to copy and distribute verbatim copies
- of this license document, but modification is not allowed.
-
-
-Preamble
-========
-
-The LaTeX Project Public License (LPPL) is the license under which the
-base LaTeX distribution is distributed. As described below you may use
-this licence for any software that you wish to distribute.
-
-It may be particularly suitable if your software is TeX related (such
-as a LaTeX package file) but it may be used for any software, even if
-it is unrelated to TeX.
-
-To use this license, the files of your distribution should have an
-explicit copyright notice giving your name and the year, together
-with a reference to this license.
-
-A typical example would be
-
- %% pig.sty
- %% Copyright 2001 M. Y. Name
-
- % This program can redistributed and/or modified under the terms
- % of the LaTeX Project Public License Distributed from CTAN
- % archives in directory macros/latex/base/lppl.txt; either
- % version 1 of the License, or (at your option) any later version.
-
-Given such a notice in the file, the conditions of this document would
-apply, with:
-
-`The Program' referring to the software `pig.sty' and
-`The Copyright Holder' referring to the person `M. Y. Name'.
-
-To see a real example, see the file legal.txt which carries the
-copyright notice for the base latex distribution.
-
-This license gives terms under which files of The Program may be
-distributed and modified. Individual files may have specific further
-constraints on modification, but no file should have restrictions on
-distribution other than those specified below.
-This is to ensure that a distributor wishing to distribute a complete
-unmodified copy of The Program need only check the conditions in this
-file, and does not need to check every file in The Program for extra
-restrictions. If you do need to modify the distribution terms of some
-files, do not refer to this license, instead distribute The Program
-under a different license. You may use the parts of the text of LPPL as
-a model for your own license, but your license should not directly refer
-to the LPPL or otherwise give the impression that The Program is
-distributed under the LPPL.
-
-
-
-The LaTeX Project Public License
-================================
-Terms And Conditions For Copying, Distribution And Modification
-===============================================================
-
-
-WARRANTY
-========
-
-There is no warranty for The Program, to the extent permitted by
-applicable law. Except when otherwise stated in writing, The
-Copyright Holder provides The Program `as is' without warranty of any
-kind, either expressed or implied, including, but not limited to, the
-implied warranties of merchantability and fitness for a particular
-purpose. The entire risk as to the quality and performance of the
-program is with you. Should The Program prove defective, you assume
-the cost of all necessary servicing, repair or correction.
-
-In no event unless required by applicable law or agreed to in writing
-will The Copyright Holder, or any of the individual authors named in
-the source for The Program, be liable to you for damages, including
-any general, special, incidental or consequential damages arising out
-of any use of The Program or out of inability to use The Program
-(including but not limited to loss of data or data being rendered
-inaccurate or losses sustained by you or by third parties as a result
-of a failure of The Program to operate with any other programs), even
-if such holder or other party has been advised of the possibility of
-such damages.
-
-
-DISTRIBUTION
-============
-
-Redistribution of unchanged files is allowed provided that all files
-that make up the distribution of The Program are distributed.
-In particular this means that The Program has to be distributed
-including its documentation if documentation was part of the original
-distribution.
-
-The distribution of The Program will contain a prominent file
-listing all the files covered by this license.
-
-If you receive only some of these files from someone, complain!
-
-The distribution of changed versions of certain files included in the
-The Program, and the reuse of code from The Program, are allowed
-under the following restrictions:
-
- * It is allowed only if the legal notice in the file does not
- expressly forbid it.
- See note below, under "Conditions on individual files".
-
- * You rename the file before you make any changes to it, unless the
- file explicitly says that renaming is not required. Any such changed
- files must be distributed under a license that forbids distribution
- of those files, and any files derived from them, under the names used
- by the original files in the distribution of The Program.
-
- * You change any `identification string' in The Program to clearly
- indicate that the file is not part of the standard system.
-
- * If The Program includes an `error report address' so that errors
- may be reported to The Copyright Holder, or other specified
- addresses, this address must be changed in any modified versions of
- The Program, so that reports for files not maintained by the
- original program maintainers are directed to the maintainers of the
- changed files.
-
- * You acknowledge the source and authorship of the original version
- in the modified file.
-
- * You also distribute the unmodified version of the file or
- alternatively provide sufficient information so that the
- user of your modified file can be reasonably expected to be
- able to obtain an original, unmodified copy of The Program.
- For example, you may specify a URL to a site that you expect
- will freely provide the user with a copy of The Program (either
- the version on which your modification is based, or perhaps a
- later version).
-
- * If The Program is intended to be used with, or is based on, LaTeX,
- then files with the following file extensions which have special
- meaning in LaTeX Software, have special modification rules under the
- license:
-
- - Files with extension `.ins' (installation files): these files may
- not be modified at all because they contain the legal notices
- that are placed in the generated files.
-
- - Files with extension `.fd' (LaTeX font definitions files): these
- files are allowed to be modified without changing the name, but
- only to enable use of all available fonts and to prevent attempts
- to access unavailable fonts. However, modified files are not
- allowed to be distributed in place of original files.
-
- - Files with extension `.cfg' (configuration files): these files
- can be created or modified to enable easy configuration of the
- system. The documentation in cfgguide.tex in the base LaTeX
- distribution describes when it makes sense to modify or generate
- such files.
-
-
-The above restrictions are not intended to prohibit, and hence do
-not apply to, the updating, by any method, of a file so that it
-becomes identical to the latest version of that file in The Program.
-
-========================================================================
-
-NOTES
-=====
-
-We believe that these requirements give you the freedom you to make
-modifications that conform with whatever technical specifications you
-wish, whilst maintaining the availability, integrity and reliability of
-The Program. If you do not see how to achieve your goal whilst
-adhering to these requirements then read the document cfgguide.tex
-in the base LaTeX distribution for suggestions.
-
-Because of the portability and exchangeability aspects of systems
-like LaTeX, The LaTeX3 Project deprecates the distribution of
-non-standard versions of components of LaTeX or of generally available
-contributed code for them but such distributions are permitted under the
-above restrictions.
-
-The document modguide.tex in the base LaTeX distribution details
-the reasons for the legal requirements detailed above.
-Even if The Program is unrelated to LaTeX, the argument in
-modguide.tex may still apply, and should be read before
-a modified version of The Program is distributed.
-
-
-Conditions on individual files
-==============================
-
-The individual files may bear additional conditions which supersede
-the general conditions on distribution and modification contained in
-this file. If there are any such files, the distribution of The
-Program will contain a prominent file that lists all the exceptional
-files.
-
-Typical examples of files with more restrictive modification
-conditions would be files that contain the text of copyright notices.
-
- * The conditions on individual files differ only in the
- extent of *modification* that is allowed.
-
- * The conditions on *distribution* are the same for all the files.
- Thus a (re)distributor of a complete, unchanged copy of The Program
- need meet only the conditions in this file; it is not necessary to
- check the header of every file in the distribution to check that a
- distribution meets these requirements.