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.
