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The LaTeX Project Public License
LPPL Version 1.3b 2006-01-07
Copyright 1999 2002-2006 LaTeX3 Project
Everyone is allowed to distribute verbatim copies of this
license document, but modification of it is not allowed.
The LaTeX Project Public License (LPPL) is the primary license under
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below, gives instructions, examples, and recommendations for authors
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In this license document the following terms are used:
Any work being distributed under this License.
`Derived Work'
Any work that under any applicable law is derived from the Work.
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1. Activities other than distribution and/or modification of the Work
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The Work changes from status `maintained' to `unmaintained' if there
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You can become the Current Maintainer of the Work by agreement with
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If the Work is unmaintained, you can become the Current Maintainer of
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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.
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
% 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
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.