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Federico Marotta
4 years ago
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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 |
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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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|
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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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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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|
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|
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WHETHER AND HOW TO DISTRIBUTE WORKS UNDER THIS LICENSE |
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====================================================== |
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|
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This section contains important instructions, examples, and |
||||
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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|
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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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|
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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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|
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A Recommendation on Modification Without Distribution |
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----------------------------------------------------- |
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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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|
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How to Use This License |
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----------------------- |
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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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|
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Here is an example of such a notice and statement: |
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|
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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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|
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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' |
||||
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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|
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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 |
||||
yourself. |
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|
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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 for the user community. They therefore concern themselves |
||||
with the case that a Derived Work is intended to be used as a |
||||
(compatible or incompatible) replacement of the original Work. If |
||||
this is not the case (e.g., if a few lines of code are reused for a |
||||
completely different task), then clauses 6b and 6d shall not apply. |
||||
|
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|
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Important Recommendations |
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------------------------- |
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|
||||
Defining What Constitutes the Work |
||||
|
||||
The LPPL requires that distributions of the Work contain all the |
||||
files of the Work. It is therefore important that you provide a |
||||
way for the licensee to determine which files constitute the Work. |
||||
This could, for example, be achieved by explicitly listing all the |
||||
files of the Work near the copyright 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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|
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in that place. In the absence of an unequivocal list it might be |
||||
impossible for the licensee to determine what is considered by you |
||||
to comprise the Work and, in such a case, the licensee would be |
||||
entitled to make reasonable conjectures as to which files comprise |
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the Work. |
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