path: root/licenses/lppl-1.2

The LaTeX Project Public License 1.2

LPPL Version 1.2 19990903

Copyright 1999 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 license under which the base
LaTeX distribution is distributed.

You may use this license for any program that you have written and wish to
distribute. This license may be particularly suitable if your program is
TeXrelated (such as a LaTeX package), but you may use it even if your
program is unrelated to TeX. The section “WHETHER AND HOW TO DISTRIBUTE
PROGRAMS UNDER THIS LICENSE&rdqou;, below, gives instructions, examples,
and recommendations for authors who are considering distributing
their programs under this license.

In this license document, “The Program” refers to any program distributed
under this license.

This license gives conditions under which The Program may be distributed
and conditions under which modified versions of The Program may be
distributed. Individual files of The Program may bear supplementary and
/or superseding conditions on modification of themselves and on the
distribution of modified versions of themselves, but *no* file of The
Program may bear supplementary or superseding conditions on the
distribution of an unmodified copy of the file. A distributor wishing
to distribute a complete, unmodified copy of The Program therefore needs
to check the conditions only in this license and nowhere else.

Activities other than distribution and/or modification of The
Program are not covered by this license; they are outside its scope. In
particular, the act of running The Program is not restricted.

We, the LaTeX3 Project, believe that the conditions below give you the
freedom to make and distribute modified versions of The Program that
conform with whatever technical specifications you wish while
maintaining the availability, integrity, and reliability of The
Program. If you do not see how to achieve your goal while meeting these
conditions, then read the document “cfgguide.tex” in the base LaTeX
distribution for suggestions.

CONDITIONS ON DISTRIBUTION AND MODIFICATION

You may distribute a complete, unmodified copy of The Program.
Distribution of only part of The Program is not allowed.

You may not modify in any way a file of The Program that bears a legal
notice forbidding modification of that file.

You may distribute a modified file of The Program if, and only if, the
following eight conditions are met:

 1. You must meet any additional conditions borne by the file on the
    distribution of a modified version of the file as described below
    in the subsection “Additional Conditions on Individual Files of
    The Program”.
 2. If the file is a LaTeX software file, then you must meet any applicable
    additional conditions on the distribution of a modified version
    of the file that are described below in the subsection “Additional
    Conditions on LaTeX Software Files”.
 3. You must not distribute the modified file with the filename of the
    original file.
 4. In the modified file, you must acknowledge the authorship and name of
    the original file, and the name (if any) of the program which contains
    it.
 5. You must change any identification string in the file to indicate
    clearly that the modified file is not part of The Program.
 6. You must change any addresses in the modified file for the reporting
    of errors in the file or in The Program generally to ensure that
    reports for files no longer maintained by the original maintainers
    will be directed to the maintainers of the modified files.
 7. You must distribute the modified file under a license that forbids
    distribution both of the modified file and of any files derived from
    the modified file with the filename of the original file.
 8. You must do either (A) or (B):

    (A)
        distribute a copy of The Program (that is, a complete, unmodified
        copy of The Program) together with the modified file; if your
        distribution of the modified file is made by offering access to
        copy the modified file from a designated place, then offering
        equivalent access to copy The Program from the same place meets
        this condition, even though third parties are not compelled to copy
        The Program along with the modified file;
    (B)
        provide to those who receive the modified file information that
        is sufficient for them to obtain a copy of The Program; for
        example, you may provide a Uniform Resource Locator (URL) for a
        site that you expect will provide them with a copy of The Program
        free of charge (either the version from which your modification
        is derived, or perhaps a later version).

Note that in the above, “distribution” of a file means making the file
available to others by any means. This includes, for instance, installing
the file on any machine in such a way that the file is accessible by users
other than yourself. “Modification” of a file means any procedure that
produces a derivative file under any applicable law – that is, a file
containing the original file or a significant portion of it, either
verbatim or with modifications and/or translated into another
language.

Changing the name of a file (other than as necessitated by the file
conventions of the target file systems) is considered to be a
modification of the file.

The distribution conditions in this license do not have to be applied to
files that have been modified in accordance with the above conditions.
Note, however, that Condition 7. does apply to any such modified file.

The conditions above 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 of The Program.

A Recommendation on Modification Without Distribution

It is wise never to modify a file of The Program, even for your own personal
use, without also meeting the above eight conditions for distributing the
modified file. While you might intend that such modified files will never
be distributed, often this will happen by accident – you may forget that
you have modified the file; or it may not occur to you when allowing
others to access the modified file that you are thus distributing it and
violating the conditions of this license. It is usually in your best
interest to keep your copy of The Program identical with the public one.
Many programs provide ways to control the behavior of that program
without altering its licensed files.

Additional Conditions on Individual Files of The Program

An individual file of The Program may bear additional conditions that
supplement and/or supersede the conditions in this license if, and only
if, such additional conditions exclusively concern modification of
the file or distribution of a modified version of the file. The
conditions on individual files of The Program therefore may differ only
with respect to the kind and extent of modification of those files that
is allowed, and with respect to the distribution of modified versions
of those files.

Additional Conditions on LaTeX Software Files

If a file of The Program is intended to be used with LaTeX (that is, if it is
a LaTeX software file), then the following additional conditions, which
supplement and/or supersede the conditions above, apply to the file
according to its filename extension:

  • You may not modify any file with filename extension “.ins” since these
    are installation files containing the legal notices that are placed
    in the files they generate.
  • You may distribute modified versions of files with filename
    extension “.fd” (LaTeX font definition files) under the standard
    conditions of the LPPL as described above. You may also distribute such
    modified LaTeX font definition files with their original names
    provided that:

    (1)
        the only changes to the original files either enable use of
        available fonts or prevent attempts to access unavailable fonts;
    (2)
        you also distribute the original, unmodified files (TeX input
        paths can be used to control which set of LaTeX font definition
        files is actually used by TeX).

  • You may distribute modified versions of files with filename
    extension “.cfg” (configuration files) with their original names.
    The Program may (and usually will) specify the range of commands that
    are allowed in a particular configuration file.

Because of portability and exchangeability issues in LaTeX software,
The LaTeX3 Project deprecates the distribution of modified versions of
components of LaTeX or of generally available contributed code for them,
but such distribution can meet the conditions of this license.

NO WARRANTY

There is no warranty for The Program. 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 agreed to in writing will The Copyright Holder, or any
author named in the files of The Program, or any other party who may
distribute and/or modify The Program as permitted above, 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, data being rendered inaccurate, or losses sustained by anyone as a
result of any failure of The Program 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.

WHETHER AND HOW TO DISTRIBUTE PROGRAMS UNDER THIS LICENSE

This section contains important instructions, examples, and
recommendations for authors who are considering distributing their
programs under this license. These authors are addressed as “you” in this
section.

Choosing This License or Another License

If for any part of your program you want or need to use *distribution*
conditions that differ from those in this license, then do not refer to
this license anywhere in your program but instead distribute your program
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 program 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 program is unrelated
to LaTeX , the discussion in “modguide.tex” may still be relevant, and
authors intending to distribute their programs under any license are
encouraged to read it.

How to Use This License

To use this license, place in each of the files of your program both an
explicit copyright notice including your name and the year and also a
statement that the distribution and/or modification of the file is
constrained by the conditions in this license.

Here is an example of such a notice and statement:

  %% pig.dtx
  %% Copyright 2001 M. Y. Name
  %
  % This program may be distributed and/or modified under the
  % conditions of the LaTeX Project Public License, either version 1.2
  % of this license or (at your option) any later version.
  % The latest version of this license is in
  %   http://www.latexproject.org/lppl.txt
  % and version 1.2 or later is part of all distributions of LaTeX
  % version 1999/12/01 or later.
  %
  % This program consists of the files pig.dtx and pig.ins

Given such a notice and statement in a file, the conditions given in this
license document would apply, with “The Program” referring to the two
files “pig.dtx” and “pig.ins”, and “The Copyright Holder” referring to the
person “M. Y. Name”.

Important Recommendations

Defining What Constitutes The Program

The LPPL requires that distributions of The Program contain all the files
of The Program. It is therefore important that you provide a way for the
licensee to determine which files constitute The Program. This could, for
example, be achieved by explicitly listing all the files of The Program
near the copyright notice of each file or by using a line like

    % This program 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 Program.

Noting Exceptional Files

If The Program contains any files bearing additional conditions on
modification, or on distribution of modified versions, of those files
(other than those listed in “Additional Conditions on LaTeX Software
Files”), then it is recommended that The Program contain a prominent file
that defines the exceptional conditions, and either lists the
exceptional files or defines one or more categories of exceptional
files.

Files containing the text of a license (such as this file) are often
examples of files bearing more restrictive conditions on
modification. LaTeX configuration files (with filename extension
“.cfg”) are examples of files bearing less restrictive conditions on the
distribution of a modified version of the file. The additional
conditions on LaTeX software given above are examples of declaring a
category of files bearing exceptional additional conditions.