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-<?xml version="1.0"?>
-<!DOCTYPE chapter PUBLIC "+//Silmaril//DTD DocBook 5.0//EN"
- "/dtds/docbook/docbook-5.0/dtd/docbook.dtd" [
-<!ENTITY TeX "\TeX{}">
-<!ENTITY LaTeX "\LaTeX{}">
-<!ENTITY LaTeX3 "\LaTeX{3}">
-<!ENTITY mdash "~--- ">
-<!ENTITY nbsp "~">
-]>
-<chapter xml:id="LPPL:LPPL" version="1.3c" xml:lang="en:US"
- revision="2008-05-04" annotations="Copyright 1999, 2002--2008
- &LaTeX3; Project">
- <title>The &LaTeX; Project Public License</title>
- <blockquote>
- <para>Everyone is allowed to distribute verbatim copies of this
- license document, but modification of it is not allowed.</para>
- </blockquote>
- <sect1 xml:id="LPPL:Preamble">
- <title>Preamble</title>
- <para>The &LaTeX; Project Public License (<acronym>LPPL</acronym>)
- is the primary license under which the &LaTeX; kernel and the
- base &LaTeX; packages are distributed.</para>
- <para>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;.</para>
- <para>The section <citetitle linkend="LPPL:Distribute"
- pubwork="section"/>, below, gives instructions, examples, and
- recommendations for authors who are considering distributing
- their works under this license.</para>
- <para>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.</para>
- <para>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
- <filename xlink:type="tex">cfgguide</filename> and <filename
- xlink:type="tex">modguide</filename> in the base &LaTeX;
- distribution for suggestions.</para>
- </sect1>
- <sect1 xml:id="LPPL:Definitions">
- <title>Definitions</title>
- <para>In this license document the following terms are used:</para>
- <variablelist>
- <varlistentry>
- <term>Work</term>
- <listitem>
- <para>Any work being distributed under this License.</para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term>Derived Work</term>
- <listitem>
- <para>Any work that under any applicable law is derived from
- the Work.</para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term>Modification</term>
- <listitem>
- <para>Any procedure that produces a Derived Work under any
- applicable law&mdash;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.</para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term>Modify</term>
- <listitem>
- <para>To apply any procedure that produces a Derived Work
- under any applicable law.</para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term>Distribution</term>
- <listitem>
- <para>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
- <acronym>FTP</acronym> or <acronym>HTTP</acronym> or by
- shared file systems such as Sun's Network File System
- (<acronym>NFS</acronym>).</para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term>Compiled Work</term>
- <listitem>
- <para>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.</para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term>Current Maintainer</term>
- <listitem>
- <para>A person or persons nominated as such within the Work.
- If there is no such explicit nomination then it is the
- <phrase>Copyright Holder</phrase> under any applicable
- law.</para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term>Base Interpreter</term>
- <listitem>
- <para>A program or process that is normally needed for
- running or interpreting a part or the whole of the
- Work.</para>
- <para>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
- <phrase>&LaTeX;-Format</phrase> or in the case of files
- belonging to the <phrase>&LaTeX;-format</phrase> a program
- implementing the `&TeX; language'.</para>
- </listitem>
- </varlistentry>
- </variablelist>
- </sect1>
- <sect1 xml:id="LPPL:Conditions">
- <title>Conditions on Distribution and Modification</title>
- <orderedlist>
- <listitem>
- <para>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.</para>
- </listitem>
- <listitem xml:id="LPPL:item:distribute">
- <para>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.</para>
- </listitem>
- <listitem>
- <para>You may distribute a Compiled Work that has been
- generated from a complete, unmodified copy of the Work as
- distributed under Clause&nbsp;<xref
- linkend="LPPL:item:distribute"/> 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.</para>
- </listitem>
- <listitem xml:id="LPPL:item:currmaint">
- <para>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.</para>
- </listitem>
- <listitem>
- <para>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.</para>
- </listitem>
- <listitem xml:id="LPPL:item:conditions">
- <para>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.</para>
- <orderedlist>
- <listitem>
- <para>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.</para>
- </listitem>
- <listitem>
- <para>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.</para>
- </listitem>
- <listitem>
- <para>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.</para>
- </listitem>
- <listitem>
- <para>You distribute at least one of the following with
- the Derived Work:</para>
- <orderedlist>
- <listitem>
- <para>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;</para>
- </listitem>
- <listitem>
- <para>Information that is sufficient to obtain a
- complete, unmodified copy of the Work.</para>
- </listitem>
- </orderedlist>
- </listitem>
- </orderedlist>
- </listitem>
- <listitem>
- <para>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&nbsp;<xref
- linkend="LPPL:item:conditions"/>, above, are met
- with regard to the Derived Work.</para>
- </listitem>
- <listitem>
- <para>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&nbsp;<xref
- linkend="LPPL:item:currmaint"/>, above.</para>
- </listitem>
- <listitem>
- <para>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.</para>
- </listitem>
- <listitem>
- <orderedlist>
- <listitem>
- <para>A Derived Work may be distributed under a different
- license provided that license itself honors the
- conditions listed in Clause&nbsp;<xref
- linkend="LPPL:item:conditions"/> above, in
- regard to the Work, though it does not have to honor the
- rest of the conditions in this license.</para>
- </listitem>
- <listitem>
- <para>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&nbsp;<xref
- linkend="LPPL:item:conditions"/> above, concerning
- changes from the Work.</para>
- </listitem>
- </orderedlist>
- </listitem>
- <listitem>
- <para>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.</para>
- </listitem>
- <listitem>
- <para>Nothing in this license is intended to, or may be used
- to, prevent complete compliance by all parties with all
- applicable laws.</para>
- </listitem>
- </orderedlist>
- </sect1>
- <sect1 xml:id="LPPL:Warranty">
- <title>No Warranty</title>
- <para>There is no warranty for the Work. Except when otherwise
- stated in writing, the Copyright Holder provides the Work
- <phrase>as is</phrase>, 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.</para>
- <para>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.</para>
- </sect1>
- <sect1 xml:id="LPPL:Maintenance">
- <title>Maintenance of The Work</title>
- <para>The Work has the status <phrase>author-maintained</phrase>
- 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
- <phrase>author-maintained</phrase>.</para>
- <para>The Work has the status <phrase>maintained</phrase> 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.</para>
- <para>The Work changes from status <phrase>maintained</phrase> to
- <phrase>unmaintained</phrase> 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.</para>
- <para>You can become the Current Maintainer of the Work by
- agreement with any existing Current Maintainer to take over this
- role.</para>
- <para>If the Work is unmaintained, you can become the Current
- Maintainer of the Work through the following steps:</para>
- <orderedlist>
- <listitem>
- <para>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.</para>
- </listitem>
- <listitem>
- <para>If this search is successful, then enquire whether the
- Work is still maintained.</para>
- <orderedlist>
- <listitem>
- <para>If it is being maintained, then ask the Current
- Maintainer to update their communication data within one
- month.</para>
- </listitem>
- <listitem xml:id="LPPL:item:intention">
- <para>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 <uri type="news">comp.text.tex</uri>.)</para>
- </listitem>
- </orderedlist>
- </listitem>
- <listitem>
- <orderedlist>
- <listitem>
- <para>If the Current Maintainer is reachable and agrees to
- pass maintenance of the Work to you, then this takes
- effect immediately upon announcement.</para>
- </listitem>
- <listitem xml:id="LPPL:item:announce">
- <para>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.</para>
- </listitem>
- </orderedlist>
- </listitem>
- <listitem xml:id="LPPL:item:change">
- <para>If you make an <phrase>intention announcement</phrase>
- as described in&nbsp;<xref
- linkend="LPPL:item:intention"/> 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.</para>
- </listitem>
- <listitem>
- <para>If the previously unreachable Current Maintainer becomes
- reachable once more within three months of a change
- completed under the terms of&nbsp;<xref
- linkend="LPPL:item:announce"/>
- or&nbsp;<xref linkend="LPPL:item:change"/>, then that
- Current
- Maintainer must become or remain the Current Maintainer upon
- request provided they then update their communication data
- within one month.</para>
- </listitem>
- </orderedlist>
- <para>A change in the Current Maintainer does not, of itself,
- alter the fact that the Work is distributed under the
- <acronym>LPPL</acronym> license.</para>
- <para>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&nbsp;<xref linkend="LPPL:item:intention"/>
- above.</para>
- </sect1>
- <sect1 xml:id="LPPL:Distribute">
- <title>Whether and How to Distribute Works under This
- License</title>
- <para>This section contains important instructions, examples, and
- recommendations for authors who are considering distributing
- their works under this license. These authors are addressed as
- <wordasword>you</wordasword> in this section.</para>
- <sect2 xml:id="LPPL:Choosing">
- <title>Choosing This License or Another License</title>
- <para>If for any part of your work you want or need to use
- <emphasis>distribution</emphasis> 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 <acronym>LPPL</acronym> or otherwise
- give the impression that your work is distributed under the
- <acronym>LPPL</acronym>.</para>
- <para>The document <filename
- xlink:type="tex">modguide</filename> in the base &LaTeX;
- distribution explains the motivation behind the conditions of
- this license. It explains, for example, why distributing
- &LaTeX; under the <acronym>GNU</acronym> General Public
- License (<acronym>GPL</acronym>) was considered inappropriate.
- Even if your work is unrelated to &LaTeX;, the discussion in
- <filename xlink:type="tex">modguide</filename> may still be
- relevant, and authors intending to distribute their works
- under any license are encouraged to read it.</para>
- </sect2>
- <sect2 xml:id="LPPL:WithoutDistribution">
- <title>A Recommendation on Modification Without
- Distribution</title>
- <para>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&mdash;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.</para>
- </sect2>
- <sect2 xml:id="LPPL:HowTo">
- <title>How to Use This License</title>
- <para>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.</para>
- <para>Here is an example of such a notice and statement:</para>
- <programlisting>
-%%% 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.
- </programlisting>
- <para>Given such a notice and statement in a file, the
- conditions given in this license document would apply, with
- the <wordasword>Work</wordasword> referring to the three files
- <filename xlink:type="dtx">pig</filename>, <filename
- xlink:type="ins">pig</filename>, and <filename
- xlink:type="sty">pig</filename> (the last being generated
- from <filename xlink:type="dtx">pig</filename> using <filename
- xlink:type="ins">pig</filename>), the <phrase>Base
- Interpreter</phrase> referring to any
- <phrase>&LaTeX;-Format</phrase>, and both <phrase>Copyright
- Holder</phrase> and <phrase>Current Maintainer</phrase>
- referring to the person
- <personname>M.&nbsp;Y.&nbsp;Name</personname>.</para>
- <para>If you do not want the Maintenance section of
- <acronym>LPPL</acronym> to apply to your Work, change
- <wordasword>maintained</wordasword> above into
- <phrase>author-maintained</phrase>. However, we recommend that
- you use <wordasword>maintained</wordasword> 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.</para>
- </sect2>
- <sect2 xml:id="LPPL:NotReplacements">
- <title>Derived Works That Are Not Replacements</title>
- <para>Several clauses of the <acronym>LPPL</acronym> 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.</para>
- </sect2>
- <sect2 xml:id="LPPL:Recommendations">
- <title>Important Recommendations</title>
- <sect3>
- <title>Defining What Constitutes the Work</title>
- <para>The <acronym>LPPL</acronym> 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:</para>
- <programlisting>
-%% This work consists of all files listed in manifest.txt.
- </programlisting>
- <para>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.</para>
- </sect3>
- </sect2>
- </sect1>
-</chapter>