# Licenses:LPPL

For quick reference, the text of the LaTeX Project Public License (LPPL) as distributed with Arch Linux:

    The LaTeX Project Public License
    =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

    LPPL Version 1.3c  2008-05-04

    Copyright 1999 2002-2008 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
    it is written in such a way that you can use it 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.

       `Derived Work'
        Any work that under any applicable law is derived from the Work.

       `Modification'
        Any procedure that produces a Derived Work under any applicable
        law -- for example, the production of a file containing an
        original file associated with the Work or a significant portion of
        such a file, either verbatim or with modifications and/or
        translated into another language.

       `Modify'
        To apply any procedure that produces a Derived Work under any
        applicable law.

       `Distribution'
        Making copies of the Work available from one person to another, in
        whole or in part.  Distribution includes (but is not limited to)
        making any electronic components of the Work accessible by
        file transfer protocols such as FTP or HTTP or by shared file
        systems such as Sun's Network File System (NFS).

       `Compiled Work'
        A version of the Work that has been processed into a form where it
        is directly usable on a computer system.  This processing may
        include using installation facilities provided by the Work,
        transformations of the Work, copying of components of the Work, or
        other activities.  Note that modification of any installation
        facilities provided by the Work constitutes modification of the Work.

       `Current Maintainer'
        A person or persons nominated as such within the Work.  If there is
        no such explicit nomination then it is the `Copyright Holder' under
        any applicable law.

       `Base Interpreter'
        A program or process that is normally needed for running or
        interpreting a part or the whole of the Work.

        A Base Interpreter may depend on external components but these
        are not considered part of the Base Interpreter provided that each
        external component clearly identifies itself whenever it is used
        interactively.  Unless explicitly specified when applying the
        license to the Work, the only applicable Base Interpreter is a
        `LaTeX-Format' or in the case of files belonging to the
        `LaTeX-format' a program implementing the `TeX language'.

    CONDITIONS ON DISTRIBUTION AND MODIFICATION
    ===========================================

    1.  Activities other than distribution and/or modification of the Work
    are not covered by this license; they are outside its scope.  In
    particular, the act of running the Work is not restricted and no
    requirements are made concerning any offers of support for the Work.

    2.  You may distribute a complete, unmodified copy of the Work as you
    received it.  Distribution of only part of the Work is considered
    modification of the Work, and no right to distribute such a Derived
    Work may be assumed under the terms of this clause.

    3.  You may distribute a Compiled Work that has been generated from a
    complete, unmodified copy of the Work as distributed under Clause 2
    above, as long as that Compiled Work is distributed in such a way that
    the recipients may install the Compiled Work on their system exactly
    as it would have been installed if they generated a Compiled Work
    directly from the Work.

    4.  If you are the Current Maintainer of the Work, you may, without
    restriction, modify the Work, thus creating a Derived Work.  You may
    also distribute the Derived Work without restriction, including
    Compiled Works generated from the Derived Work.  Derived Works
    distributed in this manner by the Current Maintainer are considered to
    be updated versions of the Work.

    5.  If you are not the Current Maintainer of the Work, you may modify
    your copy of the Work, thus creating a Derived Work based on the Work,
    and compile this Derived Work, thus creating a Compiled Work based on
    the Derived Work.

    6.  If you are not the Current Maintainer of the Work, you may
    distribute a Derived Work provided the following conditions are met
    for every component of the Work unless that component clearly states
    in the copyright notice that it is exempt from that condition.  Only
    the Current Maintainer is allowed to add such statements of exemption
    to a component of the Work.

      a. If a component of this Derived Work can be a direct replacement
         for a component of the Work when that component is used with the
         Base Interpreter, then, wherever this component of the Work
         identifies itself to the user when used interactively with that
         Base Interpreter, the replacement component of this Derived Work
         clearly and unambiguously identifies itself as a modified version
         of this component to the user when used interactively with that
         Base Interpreter.

      b. Every component of the Derived Work contains prominent notices
         detailing the nature of the changes to that component, or a
         prominent reference to another file that is distributed as part
         of the Derived Work and that contains a complete and accurate log
         of the changes.

      c. No information in the Derived Work implies that any persons,
         including (but not limited to) the authors of the original version
         of the Work, provide any support, including (but not limited to)
         the reporting and handling of errors, to recipients of the
         Derived Work unless those persons have stated explicitly that
         they do provide such support for the Derived Work.

      d. You distribute at least one of the following with the Derived Work:

           1. A complete, unmodified copy of the Work;
              if your distribution of a modified component is made by
              offering access to copy the modified component from a
              designated place, then offering equivalent access to copy
              the Work from the same or some similar place meets this
              condition, even though third parties are not compelled to
              copy the Work along with the modified component;

           2. Information that is sufficient to obtain a complete,
              unmodified copy of the Work.

    7.  If you are not the Current Maintainer of the Work, you may
    distribute a Compiled Work generated from a Derived Work, as long as
    the Derived Work is distributed to all recipients of the Compiled
    Work, and as long as the conditions of Clause 6, above, are met with
    regard to the Derived Work.

    8.  The conditions above are not intended to prohibit, and hence do not
    apply to, the modification, by any method, of any component so that it
    becomes identical to an updated version of that component of the Work as
    it is distributed by the Current Maintainer under Clause 4, above.

    9.  Distribution of the Work or any Derived Work in an alternative
    format, where the Work or that Derived Work (in whole or in part) is
    then produced by applying some process to that format, does not relax or
    nullify any sections of this license as they pertain to the results of
    applying that process.

    10. a. A Derived Work may be distributed under a different license
           provided that license itself honors the conditions listed in
           Clause 6 above, in regard to the Work, though it does not have
           to honor the rest of the conditions in this license.

        b. If a Derived Work is distributed under a different license, that
           Derived Work must provide sufficient documentation as part of
           itself to allow each recipient of that Derived Work to honor the
           restrictions in Clause 6 above, concerning changes from the Work.

    11. This license places no restrictions on works that are unrelated to
    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 it 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 2005 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 2005/12/01 or later.
      %
      % This work has the LPPL maintenance status `maintained'.
      %
      % The 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.

    Derived Works That Are Not Replacements
    ---------------------------------------

    Several clauses of the LPPL specify means to provide reliability and
    stability for the user community. They therefore concern themselves
    with the case that a Derived Work is intended to be used as a
    (compatible or incompatible) replacement of the original Work. If
    this is not the case (e.g., if a few lines of code are reused for a
    completely different task), then clauses 6b and 6d shall not apply.

    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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- Licenses