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303 lines
14 KiB
303 lines
14 KiB
The LaTeX Project Public License
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=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
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LPPL Version 1.1 1999-07-10 Copyright 1999 LaTeX3 Project
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Everyone is allowed to distribute verbatim copies of this license document,
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but modification of it is not allowed.
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PREAMBLE
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========
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The LaTeX Project Public License (LPPL) is the license under which the base
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LaTeX distribution is distributed.
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You may use this license for any program that you have written and wish to
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distribute. This license may be particularly suitable if your program is TeX-related
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(such as a LaTeX package), but you may use it even if your program is unrelated
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to TeX. The section `WHETHER AND HOW TO DISTRIBUTE PROGRAMS UNDER THIS LICENSE',
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below, gives instructions, examples, and recommendations for authors who are
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considering distributing their programs under this license.
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In this license document, `The Program' refers to any program distributed
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under this license.
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This license gives conditions under which The Program may be distributed and
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conditions under which modified versions of The Program may be distributed.
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Individual files of The Program may bear supplementary and/or superseding
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conditions on modification of themselves and on the distribution of modified
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versions of themselves, but *no* file of The Program may bear supplementary
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or superseding conditions on the distribution of an unmodified copy of the
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file. A distributor wishing to distribute a complete, unmodified copy of The
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Program therefore needs to check the conditions only in this license and nowhere
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else.
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Activities other than distribution and/or modification of The Program are
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not covered by this license; they are outside its scope. In particular, the
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act of running The Program is not restricted.
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We, the LaTeX3 Project, believe that the conditions below give you the freedom
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to make and distribute modified versions of The Program that conform with
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whatever technical specifications you wish while maintaining the availability,
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integrity, and reliability of The Program. If you do not see how to achieve
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your goal while meeting these conditions, then read the document `cfgguide.tex'
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in the base LaTeX distribution for suggestions.
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CONDITIONS ON DISTRIBUTION AND MODIFICATION
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===========================================
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You may distribute a complete, unmodified copy of The Program. Distribution
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of only part of The Program is not allowed.
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You may not modify in any way a file of The Program that bears a legal notice
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forbidding modification of that file.
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You may distribute a modified file of The Program if, and only if, the following
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eight conditions are met:
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1. You must meet any additional conditions borne by the file on the distribution
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of a modified version of the file as described below in the subsection `Additional
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Conditions on Individual Files of The Program'.
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2. If the file is a LaTeX software file, then you must meet any applicable
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additional conditions on the distribution of a modified version of the file
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that are described below in the subsection `Additional Conditions on LaTeX
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Software Files'.
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3. You must not distribute the modified file with the filename of the original
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file.
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4. In the modified file, you must acknowledge the authorship and name of the
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original file, and the name (if any) of the program which contains it.
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5. You must change any identification string in the file to indicate clearly
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that the modified file is not part of The Program.
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6. You must change any addresses in the modified file for the reporting of
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errors in the file or in The Program generally to ensure that reports for
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files no longer maintained by the original maintainers will be directed to
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the maintainers of the modified files.
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7. You must distribute the modified file under a license that forbids distribution
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both of the modified file and of any files derived from the modified file
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with the filename of the original file.
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8. You must do either (A) or (B):
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(A) distribute a copy of The Program (that is, a complete, unmodified copy
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of The Program) together with the modified file; if your distribution of the
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modified file is made by offering access to copy the modified file from a
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designated place, then offering equivalent access to copy The Program from
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the same place meets this condition, even though third parties are not compelled
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to copy The Program along with the modified file;
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(B) provide to those who receive the modified file information that is sufficient
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for them to obtain a copy of The Program; for example, you may provide a Uniform
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Resource Locator (URL) for a site that you expect will provide them with a
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copy of The Program free of charge (either the version from which your modification
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is derived, or perhaps a later version).
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Note that in the above, `distribution' of a file means making the file available
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to others by any means. This includes, for instance, installing the file on
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any machine in such a way that the file is accessible by users other than
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yourself. `Modification' of a file means any procedure that produces a derivative
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file under any applicable law -- that is, a file containing the original file
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or a significant portion of it, either verbatim or with modifications and/or
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translated into another language.
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Changing the name of a file is considered to be a modification of the file.
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The distribution conditions in this license do not have to be applied to files
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that have been modified in accordance with the above conditions. Note, however,
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that Condition 7. does apply to any such modified file.
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The conditions above are not intended to prohibit, and hence do not apply
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to, the updating, by any method, of a file so that it becomes identical to
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the latest version of that file of The Program.
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A Recommendation on Modification Without Distribution
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-----------------------------------------------------
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It is wise never to modify a file of The Program, even for your own personal
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use, without also meeting the above eight conditions for distributing the
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modified file. While you might intend that such modified files will never
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be distributed, often this will happen by accident -- you may forget that
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you have modified the file; or it may not occur to you when allowing others
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to access the modified file that you are thus distributing it and violating
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the conditions of this license. It is usually in your best interest to keep
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your copy of The Program identical with the public one. Many programs provide
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ways to control the behavior of that program without altering its licensed
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files.
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Additional Conditions on Individual Files of The Program
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--------------------------------------------------------
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An individual file of The Program may bear additional conditions that supplement
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and/or supersede the conditions in this license if, and only if, such additional
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conditions exclusively concern modification of the file or distribution of
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a modified version of the file. The conditions on individual files of The
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Program therefore may differ only with respect to the kind and extent of modification
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of those files that is allowed, and with respect to the distribution of modified
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versions of those files.
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Additional Conditions on LaTeX Software Files
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---------------------------------------------
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If a file of The Program is intended to be used with LaTeX (that is, if it
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is a LaTeX software file), then the following additional conditions, which
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supplement and/or supersede the conditions above, apply to the file according
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to its filename extension:
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- You may not modify any file with filename extension `.ins' since these are
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installation files containing the legal notices that are placed in the files
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they generate.
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- You may distribute modified versions of files with filename extension `.fd'
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(LaTeX font definition files) under the standard conditions of the LPPL as
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described above. You may also distribute such modified LaTeX font definition
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files with their original names provided that:
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(1) the only changes to the original files either enable use of available
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fonts or prevent attempts to access unavailable fonts;
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(2) you also distribute the original, unmodified files (TeX input paths can
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be used to control which set of LaTeX font definition files is actually used
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by TeX).
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- You may distribute modified versions of files with filename extension `.cfg'
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(configuration files) with their original names. The Program may (and usually
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will) specify the range of commands that are allowed in a particular configuration
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file.
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Because of portability and exchangeability issues in LaTeX software, The LaTeX3
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Project deprecates the distribution of modified versions of components of
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LaTeX or of generally available contributed code for them, but such distribution
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can meet the conditions of this license.
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NO WARRANTY
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===========
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There is no warranty for The Program. Except when otherwise stated in writing,
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The Copyright Holder provides The Program `as is', without warranty of any
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kind, either expressed or implied, including, but not limited to, the implied
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warranties of merchantability and fitness for a particular purpose. The entire
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risk as to the quality and performance of The Program is with you. Should
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The Program prove defective, you assume the cost of all necessary servicing,
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repair, or correction.
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In no event unless agreed to in writing will The Copyright Holder, or any
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author named in the files of The Program, or any other party who may distribute
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and/or modify The Program as permitted below, be liable to you for damages,
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including any general, special, incidental or consequential damages arising
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out of any use of The Program or out of inability to use The Program (including,
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but not limited to, loss of data, data being rendered inaccurate, or losses
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sustained by anyone as a result of any failure of The Program to operate with
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any other programs), even if The Copyright Holder or said author or said other
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party has been advised of the possibility of such damages.
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WHETHER AND HOW TO DISTRIBUTE PROGRAMS UNDER THIS LICENSE
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=========================================================
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This section contains important instructions, examples, and recommendations
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for authors who are considering distributing their programs under this license.
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These authors are addressed as `you' in this section.
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Choosing This License or Another License
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----------------------------------------
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If for any part of your program you want or need to use *distribution* conditions
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that differ from those in this license, then do not refer to this license
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anywhere in your program but instead distribute your program under a different
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license. You may use the text of this license as a model for your own license,
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but your license should not refer to the LPPL or otherwise give the impression
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that your program is distributed under the LPPL.
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The document `modguide.tex' in the base LaTeX distribution explains the motivation
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behind the conditions of this license. It explains, for example, why distributing
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LaTeX under the GNU General Public License (GPL) was considered inappropriate.
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Even if your program is unrelated to LaTeX, the discussion in `modguide.tex'
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may still be relevant, and authors intending to distribute their programs
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under any license are encouraged to read it.
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How to Use This License
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-----------------------
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To use this license, place in each of the files of your program both an explicit
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copyright notice including your name and the year and also a statement that
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the distribution and/or modification of the file is constrained by the conditions
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in this license.
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Here is an example of such a notice and statement:
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%% pig.dtx
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%% Copyright 2001 M. Y. Name
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%
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% This program may be distributed and/or modified under the
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% conditions of the LaTeX Project Public License, either version 1.1
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% of this license or (at your option) any later version.
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% The latest version of this license is in
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% http://www.latex-project.org/lppl.txt
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% and version 1.1 or later is part of all distributions of LaTeX
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% version 1999/06/01 or later.
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%
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% This program consists of the files pig.dtx and pig.ins
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Given such a notice and statement in a file, the conditions given in this
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license document would apply, with `The Program' referring to the two files
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`pig.dtx' and `pig.ins', and `The Copyright Holder' referring to the person
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`M. Y. Name'.
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Important Recommendations
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-------------------------
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Defining What Constitutes The Program
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The LPPL requires that distributions of The Program contain all the files
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of The Program. It is therefore important that you provide a way for the licensee
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to determine which files constitute The Program. This could, for example,
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be achieved by explicitly listing all the files of The Program near the copyright
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notice of each file or by using a line like
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% This program consists of all files listed in manifest.txt.
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in that place. In the absence of an unequivocal list it might be impossible
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for the licensee to determine what is considered by you to comprise The Program.
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Noting Exceptional Files
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If The Program contains any files bearing additional conditions on modification,
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or on distribution of modified versions, of those files (other than those
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listed in `Additional Conditions on LaTeX Software Files'), then it is recommended
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that The Program contain a prominent file that defines the exceptional conditions,
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and either lists the exceptional files or defines one or more categories of
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exceptional files.
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Files containing the text of a license (such as this file) are often examples
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of files bearing more restrictive conditions on modification. LaTeX configuration
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files (with filename extension `.cfg') are examples of files bearing less
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restrictive conditions on the distribution of a modified version of the file.
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The additional conditions on LaTeX software given above are examples of declaring
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a category of files bearing exceptional additional conditions.
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