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---
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title: LaTeX Project Public License v1.3c
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spdx-id: LPPL-1.3c
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source: https://latex-project.org/lppl/lppl-1-3c.html
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description: The LaTeX Project Public License (LPPL) is the primary license under which the LaTeX kernel and the base LaTeX packages are distributed.
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how: 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.
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note: An example boilerplate and more information about how to use the license can be found at the end of the license.
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using:
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permissions:
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- commercial-use
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- modifications
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- distribution
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- private-use
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conditions:
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- include-copyright
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- document-changes
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- disclose-source
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limitations:
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- liability
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- warranty
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---
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The LaTeX Project Public License
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=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
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LPPL Version 1.3c 2008-05-04
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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 the
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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
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considering distributing their works under this license.
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This license gives conditions under which a work may be distributed and
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modified, as well as conditions under which modified versions of that work may
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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
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whatever technical specifications you wish while maintaining the availability,
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integrity, and reliability of that work. If you do not see how to achieve your
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goal while meeting these conditions, then read the document `cfgguide.tex' and
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`modguide.tex' 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
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associated with the Work or a significant portion of such a file, either
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verbatim or with modifications and/or translated into another language.
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`Modify' To apply any procedure that produces a Derived Work under any
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applicable law. `Distribution' Making copies of the Work available from one
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person to another, in whole or in part. Distribution includes (but is not
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limited to) making any electronic components of the Work accessible by file
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transfer protocols such as FTP or HTTP or by shared file systems such as Sun's
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Network File System (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
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modification of any installation facilities provided by the Work constitutes
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modification of the Work.
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`Current Maintainer' A person or persons nominated as such within the Work. If
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there is no such explicit nomination then it is the `Copyright Holder' under
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any applicable law.
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`Base Interpreter' A program or process that is normally needed for running or
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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
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considered part of the Base Interpreter provided that each external component
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clearly identifies itself whenever it is used interactively. Unless explicitly
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specified when applying the license to the Work, the only applicable Base
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Interpreter is a `LaTeX-Format' or in the case of files belonging to the
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`LaTeX-format' 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 not
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covered by this license; they are outside its scope. In particular, the act of
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running the Work is not restricted and no requirements are made concerning any
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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 the
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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
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install the Compiled Work on their system exactly as it would have been
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installed 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
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restriction, modify the Work, thus creating a Derived Work. You may also
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distribute the Derived Work without restriction, including Compiled Works
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generated from the Derived Work. Derived Works distributed in this manner by
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the Current 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 copy
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of the Work, thus creating a Derived Work based on the Work, and compile this
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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 of
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the Work unless that component clearly states in the copyright notice that it
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is exempt from that condition. Only the Current Maintainer is allowed to add
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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
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component of the Work when that component is used with the Base
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Interpreter, then, wherever this component of the Work identifies itself
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to the user when used interactively with that Base Interpreter, the
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replacement component of this Derived Work clearly and unambiguously
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identifies itself as a modified version of this component to the user
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when used interactively with that Base Interpreter.
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b. Every component of the Derived Work contains prominent notices
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detailing the nature of the changes to that component, or a prominent
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reference to another file that is distributed as part of the Derived Work
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and that contains a complete 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,
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provide any support, including (but not limited to) the reporting and
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handling of errors, to recipients of the Derived Work unless those
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persons have stated explicitly that they do provide such support for the
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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
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a modified component is made by offering access to copy the modified
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component from a designated place, then offering equivalent access
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to copy the Work from the same or some similar place meets this
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condition, even though third parties are not compelled to copy the
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Work along with the modified component;
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2. Information that is sufficient to obtain a complete, unmodified
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copy of 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
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conditions 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
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identical to an updated version of that component of the Work as it is
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distributed by 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 by
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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
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that license itself honors the conditions listed in Clause 6 above, in
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regard to the Work, though it does not have to honor the rest of the
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conditions in this license.
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b. If a Derived Work is distributed under a different license, that
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Derived Work must provide sufficient documentation as part of itself to
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allow each recipient of that Derived Work to honor the restrictions in
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Clause 6 above, 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
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complete 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
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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 Work is with you. Should the
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Work prove defective, you assume the cost of all necessary servicing, repair,
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or correction.
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In no event unless required by applicable law or agreed to in writing will The
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Copyright Holder, or any author named in the components of the Work, or any
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other party who may distribute and/or modify the Work as permitted above, be
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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
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rendered inaccurate, or losses sustained by anyone as a result of any failure
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of the Work to operate with any other programs), even if the Copyright Holder
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or 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 the
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Work can only be maintained by the Copyright Holder or simply that it is
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`author-maintained'.
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The Work has the status `maintained' if there is a Current Maintainer who has
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indicated in the Work that they are willing to receive error reports for the
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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 of
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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
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existing Current Maintainer to take over this role.
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If the Work is unmaintained, you can become the Current Maintainer of the Work
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through the following steps:
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1. Make a reasonable attempt to trace the Current Maintainer (and the
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Copyright Holder, if the two differ) through the means of an Internet or
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similar search.
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2. If this search is successful, then enquire whether the Work is still
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maintained.
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a. If it is being maintained, then ask the Current Maintainer to update
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their communication data within one month.
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b. If the search is unsuccessful or no action to resume active
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maintenance is taken by the Current Maintainer, then announce within the
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pertinent community your intention to take over maintenance. (If the Work
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is a LaTeX work, this could be done, for example, by posting to
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comp.text.tex.)
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3a. If the Current Maintainer is reachable and agrees to pass maintenance of
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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
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immediately 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 the
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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 upon
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request provided they then update their communication data within one 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
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provide, within the Work, a prominent and unambiguous statement of your status
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as Current Maintainer. You should also announce your new status to the same
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pertinent 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 a
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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
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motivation behind the conditions of this license. It explains, for example,
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why distributing LaTeX under the GNU General Public License (GPL) was
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considered inappropriate. Even if your work is unrelated to LaTeX, the
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discussion in `modguide.tex' may still be relevant, and authors intending to
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distribute their works under 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
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distributed, often this will happen by accident -- you may forget that you
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have modified that component; or it may not occur to you when allowing others
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to access the modified version that you are thus distributing it and violating
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the conditions of this license in ways that could have legal implications and,
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worse, cause problems for the community. It is therefore usually in your best
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interest to keep your copy of the Work identical with the public one. Many
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works provide ways to control the behavior of that work without altering any
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of its licensed 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
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authored and/or last substantially modified. Include also a statement that the
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distribution and/or modification of that component is constrained by the
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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 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', and
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both `Copyright Holder' and `Current Maintainer' referring to the person `M.
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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 that
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you use `maintained', as the Maintenance section was added in order to ensure
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that your Work remains useful to the community even when you can no longer
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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 a
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Derived Work is intended to be used as a (compatible or incompatible)
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replacement of the original Work. If this is not the case (e.g., if a few
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lines of code are reused for a completely different task), then clauses 6b and
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6d shall 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 the
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Work. It is therefore important that you provide a way for the licensee to
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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
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conjectures as to which files comprise the Work.
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