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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.