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