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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
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by the original files in the distribution of The Program.
* You change any `identification string' in The Program to clearly
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* 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
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* 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.
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* If The Program is intended to be used with, or is based on, LaTeX,
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not be modified at all because they contain the legal notices
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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.

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The LaTeX Project Public License
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
LPPL Version 1.3a 2004-10-01
Copyright 1999 2002-04 LaTeX3 Project
Everyone is allowed to distribute verbatim copies of this
license document, but modification of it is not allowed.
PREAMBLE
========
The LaTeX Project Public License (LPPL) is the primary license under
which the LaTeX kernel and the base LaTeX packages are distributed.
You may use this license for any work of which you hold the copyright
and which you wish to distribute. This license may be particularly
suitable if your work is TeX-related (such as a LaTeX package), but
you may use it with small modifications even if your work is unrelated
to TeX.
The section `WHETHER AND HOW TO DISTRIBUTE WORKS UNDER THIS LICENSE',
below, gives instructions, examples, and recommendations for authors
who are considering distributing their works under this license.
This license gives conditions under which a work may be distributed
and modified, as well as conditions under which modified versions of
that work may be distributed.
We, the LaTeX3 Project, believe that the conditions below give you
the freedom to make and distribute modified versions of your work
that conform with whatever technical specifications you wish while
maintaining the availability, integrity, and reliability of
that work. If you do not see how to achieve your goal while
meeting these conditions, then read the document `cfgguide.tex'
and `modguide.tex' in the base LaTeX distribution for suggestions.
DEFINITIONS
===========
In this license document the following terms are used:
`Work'
Any work being distributed under this License.
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Any work that under any applicable law is derived from the Work.
`Modification'
Any procedure that produces a Derived Work under any applicable
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CONDITIONS ON DISTRIBUTION AND MODIFICATION
===========================================
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provided that license itself honors the conditions listed in
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to honor the rest of the conditions in this license.
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restrictions in Clause 6 above, concerning changes from the Work.
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the Work, nor does this license place any restrictions on aggregating
such works with the Work by any means.
12. Nothing in this license is intended to, or may be used to, prevent
complete compliance by all parties with all applicable laws.
NO WARRANTY
===========
There is no warranty for the Work. Except when otherwise stated in
writing, the Copyright Holder provides the Work `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 Work is with you. Should the Work 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 author named in the components of
the Work, or any other party who may distribute and/or modify the Work
as permitted above, be liable to you for damages, including any
general, special, incidental or consequential damages arising out of
any use of the Work or out of inability to use the Work (including,
but not limited to, loss of data, data being rendered inaccurate, or
losses sustained by anyone as a result of any failure of the Work to
operate with any other programs), even if the Copyright Holder or said
author or said other party has been advised of the possibility of such
damages.
MAINTENANCE OF THE WORK
=======================
The Work has the status `author-maintained' if the Copyright Holder
explicitly and prominently states near the primary copyright notice in
the Work that the Work can only be maintained by the Copyright Holder
or simply that is `author-maintained'.
The Work has the status `maintained' if there is a Current Maintainer
who has indicated in the Work that they are willing to receive error
reports for the Work (for example, by supplying a valid e-mail
address). It is not required for the Current Maintainer to acknowledge
or act upon these error reports.
The Work changes from status `maintained' to `unmaintained' if there
is no Current Maintainer, or the person stated to be Current
Maintainer of the work cannot be reached through the indicated means
of communication for a period of six months, and there are no other
significant signs of active maintenance.
You can become the Current Maintainer of the Work by agreement with
any existing Current Maintainer to take over this role.
If the Work is unmaintained, you can become the Current Maintainer of
the Work through the following steps:
1. Make a reasonable attempt to trace the Current Maintainer (and
the Copyright Holder, if the two differ) through the means of
an Internet or similar search.
2. If this search is successful, then enquire whether the Work
is still maintained.
a. If it is being maintained, then ask the Current Maintainer
to update their communication data within one month.
b. If the search is unsuccessful or no action to resume active
maintenance is taken by the Current Maintainer, then announce
within the pertinent community your intention to take over
maintenance. (If the Work is a LaTeX work, this could be
done, for example, by posting to comp.text.tex.)
3a. If the Current Maintainer is reachable and agrees to pass
maintenance of the Work to you, then this takes effect
immediately upon announcement.
b. If the Current Maintainer is not reachable and the Copyright
Holder agrees that maintenance of the Work be passed to you,
then this takes effect immediately upon announcement.
4. If you make an `intention announcement' as described in 2b. above
and after three months your intention is challenged neither by
the Current Maintainer nor by the Copyright Holder nor by other
people, then you may arrange for the Work to be changed so as
to name you as the (new) Current Maintainer.
5. If the previously unreachable Current Maintainer becomes
reachable once more within three months of a change completed
under the terms of 3b) or 4), then that Current Maintainer must
become or remain the Current Maintainer upon request provided
they then update their communication data within one month.
A change in the Current Maintainer does not, of itself, alter the fact
that the Work is distributed under the LPPL license.
If you become the Current Maintainer of the Work, you should
immediately provide, within the Work, a prominent and unambiguous
statement of your status as Current Maintainer. You should also
announce your new status to the same pertinent community as
in 2b) above.
WHETHER AND HOW TO DISTRIBUTE WORKS UNDER THIS LICENSE
======================================================
This section contains important instructions, examples, and
recommendations for authors who are considering distributing their
works under this license. These authors are addressed as `you' in
this section.
Choosing This License or Another License
----------------------------------------
If for any part of your work you want or need to use *distribution*
conditions that differ significantly from those in this license, then
do not refer to this license anywhere in your work but, instead,
distribute your work under a different license. You may use the text
of this license as a model for your own license, but your license
should not refer to the LPPL or otherwise give the impression that
your work is distributed under the LPPL.
The document `modguide.tex' in the base LaTeX distribution explains
the motivation behind the conditions of this license. It explains,
for example, why distributing LaTeX under the GNU General Public
License (GPL) was considered inappropriate. Even if your work is
unrelated to LaTeX, the discussion in `modguide.tex' may still be
relevant, and authors intending to distribute their works under any
license are encouraged to read it.
A Recommendation on Modification Without Distribution
-----------------------------------------------------
It is wise never to modify a component of the Work, even for your own
personal use, without also meeting the above conditions for
distributing the modified component. While you might intend that such
modifications will never be distributed, often this will happen by
accident -- you may forget that you have modified that component; or
it may not occur to you when allowing others to access the modified
version that you are thus distributing it and violating the conditions
of this license in ways that could have legal implications and, worse,
cause problems for the community. It is therefore usually in your
best interest to keep your copy of the Work identical with the public
one. Many works provide ways to control the behavior of that work
without altering any of its licensed components.
How to Use This License
-----------------------
To use this license, place in each of the components of your work both
an explicit copyright notice including your name and the year the work
was authored and/or last substantially modified. Include also a
statement that the distribution and/or modification of that
component is constrained by the conditions in this license.
Here is an example of such a notice and statement:
%% pig.dtx
%% Copyright 2003 M. Y. Name
%
% This work may be distributed and/or modified under the
% conditions of the LaTeX Project Public License, either version 1.3
% of this license or (at your option) any later version.
% The latest version of this license is in
% http://www.latex-project.org/lppl.txt
% and version 1.3 or later is part of all distributions of LaTeX
% version 2003/12/01 or later.
%
% This work has the LPPL maintenance status "maintained".
%
% This Current Maintainer of this work is M. Y. Name.
%
% This work consists of the files pig.dtx and pig.ins
% and the derived file pig.sty.
Given such a notice and statement in a file, the conditions
given in this license document would apply, with the `Work' referring
to the three files `pig.dtx', `pig.ins', and `pig.sty' (the last being
generated from `pig.dtx' using `pig.ins'), the `Base Interpreter'
referring to any "LaTeX-Format", and both `Copyright Holder' and
`Current Maintainer' referring to the person `M. Y. Name'.
If you do not want the Maintenance section of LPPL to apply to your
Work, change "maintained" above into "author-maintained".
However, we recommend that you use "maintained" as the Maintenance
section was added in order to ensure that your Work remains useful to
the community even when you can no longer maintain and support it
yourself.
Important Recommendations
-------------------------
Defining What Constitutes the Work
The LPPL requires that distributions of the Work contain all the
files of the Work. It is therefore important that you provide a
way for the licensee to determine which files constitute the Work.
This could, for example, be achieved by explicitly listing all the
files of the Work near the copyright notice of each file or by
using a line such as:
% This work consists of all files listed in manifest.txt.
in that place. In the absence of an unequivocal list it might be
impossible for the licensee to determine what is considered by you
to comprise the Work and, in such a case, the licensee would be
entitled to make reasonable conjectures as to which files comprise
the Work.

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Copyright (c) 1998, 1999 Henry Spencer. All rights reserved.
Development of this software was funded, in part, by Cray Research Inc., UUNET Communications Services Inc., Sun Microsystems Inc., and Scriptics Corporation, none of whom are responsible for the results. The author thanks all of them.
Redistribution and use in source and binary forms - with or without modification - are permitted for any purpose, provided that redistributions in source form retain this entire copyright notice and indicate the origin and nature of any modifications.
I'd appreciate being given credit for this package in the documentation of software which uses it, but that is not a requirement.
THIS SOFTWARE IS PROVIDED ``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 HENRY SPENCER 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.