392 lines
18 KiB
Text
392 lines
18 KiB
Text
The LaTeX Project Public License
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LPPL Version 1.3c 2008-05-04 Copyright 1999 2002-2008 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 primary license under which
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the LaTeX kernel and the base LaTeX packages are distributed.
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You may use this license for any work of which you hold the copyright and
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which you wish to distribute. This license may be particularly suitable if
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your work is TeX-related (such as a LaTeX package), but it is written in such
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a way that you can use it even if your work is unrelated to TeX.
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The section `WHETHER AND HOW TO DISTRIBUTE WORKS UNDER THIS LICENSE', below,
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gives instructions, examples, and recommendations for authors who are considering
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distributing their works under this license.
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This license gives conditions under which a work may be distributed and modified,
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as well as conditions under which modified versions of that work may be distributed.
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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 your work that conform with whatever
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technical specifications you wish while maintaining the availability, integrity,
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and reliability of that work. If you do not see how to achieve your goal while
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meeting these conditions, then read the document `cfgguide.tex' and `modguide.tex'
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in the base LaTeX distribution for suggestions.
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DEFINITIONS
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===========
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In this license document the following terms are used:
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`Work' Any work being distributed under this License. `Derived Work' Any work
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that under any applicable law is derived from the Work.
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`Modification' Any procedure that produces a Derived Work under any applicable
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law -- for example, the production of a file containing an original file associated
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with the Work or a significant portion of such a file, either verbatim or
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with modifications and/or translated into another language.
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`Modify' To apply any procedure that produces a Derived Work under any applicable
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law. `Distribution' Making copies of the Work available from one person to
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another, in whole or in part. Distribution includes (but is not limited to)
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making any electronic components of the Work accessible by file transfer protocols
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such as FTP or HTTP or by shared file systems such as Sun's Network File System
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(NFS).
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`Compiled Work' A version of the Work that has been processed into a form
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where it is directly usable on a computer system. This processing may include
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using installation facilities provided by the Work, transformations of the
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Work, copying of components of the Work, or other activities. Note that modification
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of any installation facilities provided by the Work constitutes modification
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of the Work.
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`Current Maintainer' A person or persons nominated as such within the Work.
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If there is no such explicit nomination then it is the `Copyright Holder'
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under any applicable law.
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`Base Interpreter' A program or process that is normally needed for running
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or interpreting a part or the whole of the Work.
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A Base Interpreter may depend on external components but these are not considered
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part of the Base Interpreter provided that each external component clearly
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identifies itself whenever it is used interactively. Unless explicitly specified
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when applying the license to the Work, the only applicable Base Interpreter
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is a `LaTeX-Format' or in the case of files belonging to the `LaTeX-format'
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a program implementing the `TeX language'.
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CONDITIONS ON DISTRIBUTION AND MODIFICATION
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===========================================
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1. Activities other than distribution and/or modification of the Work 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 Work is not restricted and no requirements are made concerning
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any offers of support for the Work.
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2. You may distribute a complete, unmodified copy of the Work as you received
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it. Distribution of only part of the Work is considered modification of the
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Work, and no right to distribute such a Derived Work may be assumed under
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the terms of this clause.
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3. You may distribute a Compiled Work that has been generated from a complete,
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unmodified copy of the Work as distributed under Clause 2 above, as long as
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that Compiled Work is distributed in such a way that the recipients may install
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the Compiled Work on their system exactly as it would have been installed
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if they generated a Compiled Work directly from the Work.
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4. If you are the Current Maintainer of the Work, you may, without restriction,
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modify the Work, thus creating a Derived Work. You may also distribute the
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Derived Work without restriction, including Compiled Works generated from
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the Derived Work. Derived Works distributed in this manner by the Current
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Maintainer are considered to be updated versions of the Work.
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5. If you are not the Current Maintainer of the Work, you may modify your
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copy of the Work, thus creating a Derived Work based on the Work, and compile
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this Derived Work, thus creating a Compiled Work based on the Derived Work.
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6. If you are not the Current Maintainer of the Work, you may distribute a
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Derived Work provided the following conditions are met for every component
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of the Work unless that component clearly states in the copyright notice that
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it is exempt from that condition. Only the Current Maintainer is allowed to
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add such statements of exemption to a component of the Work.
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a. If a component of this Derived Work can be a direct replacement for a component
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of the Work when that component is used with the Base Interpreter, then, wherever
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this component of the Work identifies itself to the user when used interactively
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with that Base Interpreter, the replacement component of this Derived Work
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clearly and unambiguously identifies itself as a modified version of this
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component to the user when used interactively with that Base Interpreter.
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b. Every component of the Derived Work contains prominent notices detailing
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the nature of the changes to that component, or a prominent reference to another
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file that is distributed as part of the Derived Work and that contains a complete
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and accurate log of the changes.
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c. No information in the Derived Work implies that any persons, including
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(but not limited to) the authors of the original version of the Work, provide
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any support, including (but not limited to) the reporting and handling of
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errors, to recipients of the Derived Work unless those persons have stated
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explicitly that they do provide such support for the Derived Work.
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d. You distribute at least one of the following with the Derived Work:
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1. A complete, unmodified copy of the Work; if your distribution of a modified
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component is made by offering access to copy the modified component from a
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designated place, then offering equivalent access to copy the Work from the
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same or some similar place meets this condition, even though third parties
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are not compelled to copy the Work along with the modified component;
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2. Information that is sufficient to obtain a complete, unmodified copy of
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the Work.
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7. If you are not the Current Maintainer of the Work, you may distribute a
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Compiled Work generated from a Derived Work, as long as the Derived Work is
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distributed to all recipients of the Compiled Work, and as long as the conditions
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of Clause 6, above, are met with regard to the Derived Work.
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8. The conditions above are not intended to prohibit, and hence do not apply
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to, the modification, by any method, of any component so that it becomes identical
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to an updated version of that component of the Work as it is distributed by
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the Current Maintainer under Clause 4, above.
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9. Distribution of the Work or any Derived Work in an alternative format,
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where the Work or that Derived Work (in whole or in part) is then produced
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by applying some process to that format, does not relax or nullify any sections
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of this license as they pertain to the results of applying that process.
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10.
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a. A Derived Work may be distributed under a different license provided that
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license itself honors the conditions listed in Clause 6 above, in regard to
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the Work, though it does not have to honor the rest of the conditions in this
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license.
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b. If a Derived Work is distributed under a different license, that Derived
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Work must provide sufficient documentation as part of itself to allow each
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recipient of that Derived Work to honor the restrictions in Clause 6 above,
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concerning changes from the Work.
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11. This license places no restrictions on works that are unrelated to the
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Work, nor does this license place any restrictions on aggregating such works
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with the Work by any means.
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12. Nothing in this license is intended to, or may be used to, prevent complete
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compliance by all parties with all applicable laws.
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NO WARRANTY
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===========
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There is no warranty for the Work. Except when otherwise stated in writing,
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the Copyright Holder provides the Work `as is', without warranty of any kind,
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either expressed or implied, including, but not limited to, the implied warranties
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of merchantability and fitness for a particular purpose. The entire risk as
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to the quality and performance of the Work is with you. Should the Work prove
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defective, you assume the cost of all necessary servicing, repair, or correction.
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In no event unless required by applicable law or agreed to in writing will
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The Copyright Holder, or any author named in the components of the Work, or
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any other party who may distribute and/or modify the Work as permitted above,
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be liable to you for damages, including any general, special, incidental or
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consequential damages arising out of any use of the Work or out of inability
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to use the Work (including, but not limited to, loss of data, data being rendered
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inaccurate, or losses sustained by anyone as a result of any failure of the
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Work to operate with any other programs), even if the Copyright Holder or
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said author or said other party has been advised of the possibility of such
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damages.
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MAINTENANCE OF THE WORK
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=======================
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The Work has the status `author-maintained' if the Copyright Holder explicitly
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and prominently states near the primary copyright notice in the Work that
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the Work can only be maintained by the Copyright Holder or simply that it
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is `author-maintained'.
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The Work has the status `maintained' if there is a Current Maintainer who
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has indicated in the Work that they are willing to receive error reports for
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the Work (for example, by supplying a valid e-mail address). It is not required
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for the Current Maintainer to acknowledge or act upon these error reports.
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The Work changes from status `maintained' to `unmaintained' if there is no
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Current Maintainer, or the person stated to be Current Maintainer of the work
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cannot be reached through the indicated means of communication for a period
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of six months, and there are no other significant signs of active maintenance.
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You can become the Current Maintainer of the Work by agreement with any existing
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Current Maintainer to take over this role.
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If the Work is unmaintained, you can become the Current Maintainer of the
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Work through the following steps:
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1. Make a reasonable attempt to trace the Current Maintainer (and the Copyright
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Holder, if the two differ) through the means of an Internet or similar search.
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2. If this search is successful, then enquire whether the Work is still maintained.
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a. If it is being maintained, then ask the Current Maintainer to update their
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communication data within one month.
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b. If the search is unsuccessful or no action to resume active maintenance
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is taken by the Current Maintainer, then announce within the pertinent community
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your intention to take over maintenance. (If the Work is a LaTeX work, this
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could be done, for example, by posting to comp.text.tex.)
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3a. If the Current Maintainer is reachable and agrees to pass maintenance
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of the Work to you, then this takes effect immediately upon announcement.
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b. If the Current Maintainer is not reachable and the Copyright Holder agrees
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that maintenance of the Work be passed to you, then this takes effect immediately
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upon announcement.
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4. If you make an `intention announcement' as described in 2b. above and after
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three months your intention is challenged neither by the Current Maintainer
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nor by the Copyright Holder nor by other people, then you may arrange for
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the Work to be changed so as to name you as the (new) Current Maintainer.
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5. If the previously unreachable Current Maintainer becomes reachable once
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more within three months of a change completed under the terms of 3b) or 4),
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then that Current Maintainer must become or remain the Current Maintainer
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upon request provided they then update their communication data within one
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month.
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A change in the Current Maintainer does not, of itself, alter the fact that
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the Work is distributed under the LPPL license.
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If you become the Current Maintainer of the Work, you should immediately provide,
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within the Work, a prominent and unambiguous statement of your status as Current
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Maintainer. You should also announce your new status to the same pertinent
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community as in 2b) above.
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WHETHER AND HOW TO DISTRIBUTE WORKS 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 works 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 work you want or need to use *distribution* conditions
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that differ significantly from those in this license, then do not refer to
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this license anywhere in your work but, instead, distribute your work under
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a different license. You may use the text of this license as a model for your
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own license, but your license should not refer to the LPPL or otherwise give
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the impression that your work 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 work is unrelated to LaTeX, the discussion in `modguide.tex'
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may still be relevant, and authors intending to distribute their works under
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any license are encouraged to read it.
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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 component of the Work, even for your own personal
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use, without also meeting the above conditions for distributing the modified
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component. While you might intend that such modifications will never be distributed,
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often this will happen by accident -- you may forget that you have modified
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that component; or it may not occur to you when allowing others to access
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the modified version that you are thus distributing it and violating the conditions
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of this license in ways that could have legal implications and, worse, cause
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problems for the community. It is therefore usually in your best interest
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to keep your copy of the Work identical with the public one. Many works provide
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ways to control the behavior of that work without altering any of its licensed
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components.
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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 components of your work both an
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explicit copyright notice including your name and the year the work was authored
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and/or last substantially modified. Include also a statement that the distribution
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and/or modification of that component is constrained by the conditions in
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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 2005 M. Y. Name
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%
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% This work may be distributed and/or modified under the
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% conditions of the LaTeX Project Public License, either version 1.3
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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 1.3 or later is part of all distributions of LaTeX
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% version 2005/12/01 or later.
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%
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% This work has the LPPL maintenance status " maintained ".
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%
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% The Current Maintainer of this work is M. Y. Name .
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%
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% This work consists of the files pig.dtx and pig.ins
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% and the derived file pig.sty .
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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 `Work' referring to the three files
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`pig.dtx', `pig.ins', and `pig.sty' (the last being generated from `pig.dtx'
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using `pig.ins'), the `Base Interpreter' referring to any `LaTeX-Format',
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and both `Copyright Holder' and `Current Maintainer' referring to the person
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`M. Y. Name'.
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If you do not want the Maintenance section of LPPL to apply to your Work,
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change `maintained' above into `author-maintained'. However, we recommend
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that you use `maintained', as the Maintenance section was added in order to
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ensure that your Work remains useful to the community even when you can no
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longer maintain and support it yourself.
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Derived Works That Are Not Replacements
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---------------------------------------
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Several clauses of the LPPL specify means to provide reliability and stability
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for the user community. They therefore concern themselves with the case that
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a Derived Work is intended to be used as a (compatible or incompatible) replacement
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of the original Work. If this is not the case (e.g., if a few lines of code
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are reused for a completely different task), then clauses 6b and 6d shall
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not apply.
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Important Recommendations
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-------------------------
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Defining What Constitutes the Work
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The LPPL requires that distributions of the Work contain all the files of
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the Work. It is therefore important that you provide a way for the licensee
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to determine which files constitute the Work. This could, for example, be
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achieved by explicitly listing all the files of the Work near the copyright
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notice of each file or by using a line such as:
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% This work 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 Work
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and, in such a case, the licensee would be entitled to make reasonable conjectures
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as to which files comprise the Work.
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