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