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LaTeX Project Public License 1.3a [2004] PubRL 73 (1 November 2004)

The LaTeX Project Public License

Version: 1.3a, 1 November 2004

Copyright: 1999-2004 LaTeX Project

URL: http://www.latex-project.org/lppl/lppl-1-3a.txt

Type: Software

Media: Software

Country: International

Licence text

PREAMBLE

========

The LaTeX Project Public License (LPPL) is the primary license under

which the 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

you may use it with small modifications 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".

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 this 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 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 2003 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 2003/12/01 or later.

%

% This work has the LPPL maintenance status "maintained".

%

% This 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.

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.