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<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
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<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—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 <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 <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 <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 <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 <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 <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 <xref
linkend="LPPL:item:announce"/>
or <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 <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—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. Y. 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>
|