| The LaTeX Project Public License |
| =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- |
| |
| LPPL Version 1.3c 2006-05-20 |
| |
| Copyright 1999 2002-2006 LaTeX3 Project |
| Everyone is allowed to distribute verbatim copies of this |
| license document, but modification of it is not allowed. |
| |
| |
| PREAMBLE |
| ======== |
| |
| The LaTeX Project Public License (LPPL) is the primary license under |
| which the the LaTeX kernel and the base LaTeX packages are distributed. |
| |
| You may use this license for any work of which you hold the copyright |
| and which you wish to distribute. This license may be particularly |
| suitable if your work is TeX-related (such as a LaTeX package), but |
| it is written in such a way that you can use it even if your work is |
| unrelated to TeX. |
| |
| The section `WHETHER AND HOW TO DISTRIBUTE WORKS UNDER THIS LICENSE', |
| below, gives instructions, examples, and recommendations for authors |
| who are considering distributing their works under this license. |
| |
| This license gives conditions under which a work may be distributed |
| and modified, as well as conditions under which modified versions of |
| that work may be distributed. |
| |
| We, the LaTeX3 Project, believe that the conditions below give you |
| the freedom to make and distribute modified versions of your work |
| that conform with whatever technical specifications you wish while |
| maintaining the availability, integrity, and reliability of |
| that work. If you do not see how to achieve your goal while |
| meeting these conditions, then read the document `cfgguide.tex' |
| and `modguide.tex' in the base LaTeX distribution for suggestions. |
| |
| |
| DEFINITIONS |
| =========== |
| |
| In this license document the following terms are used: |
| |
| `Work' |
| Any work being distributed under this License. |
| |
| `Derived Work' |
| Any work that under any applicable law is derived from the Work. |
| |
| `Modification' |
| Any procedure that produces a Derived Work under any applicable |
| law -- for example, the production of a file containing an |
| original file associated with the Work or a significant portion of |
| such a file, either verbatim or with modifications and/or |
| translated into another language. |
| |
| `Modify' |
| To apply any procedure that produces a Derived Work under any |
| applicable law. |
| |
| `Distribution' |
| Making copies of the Work available from one person to another, in |
| whole or in part. Distribution includes (but is not limited to) |
| making any electronic components of the Work accessible by |
| file transfer protocols such as FTP or HTTP or by shared file |
| systems such as Sun's Network File System (NFS). |
| |
| `Compiled Work' |
| A version of the Work that has been processed into a form where it |
| is directly usable on a computer system. This processing may |
| include using installation facilities provided by the Work, |
| transformations of the Work, copying of components of the Work, or |
| other activities. Note that modification of any installation |
| facilities provided by the Work constitutes modification of the Work. |
| |
| `Current Maintainer' |
| A person or persons nominated as such within the Work. If there is |
| no such explicit nomination then it is the `Copyright Holder' under |
| any applicable law. |
| |
| `Base Interpreter' |
| A program or process that is normally needed for running or |
| interpreting a part or the whole of the Work. |
| |
| A Base Interpreter may depend on external components but these |
| are not considered part of the Base Interpreter provided that each |
| external component clearly identifies itself whenever it is used |
| interactively. Unless explicitly specified when applying the |
| license to the Work, the only applicable Base Interpreter is a |
| `LaTeX-Format' or in the case of files belonging to the |
| `LaTeX-format' a program implementing the `TeX language'. |
| |
| |
| |
| CONDITIONS ON DISTRIBUTION AND MODIFICATION |
| =========================================== |
| |
| 1. Activities other than distribution and/or modification of the Work |
| are not covered by this license; they are outside its scope. In |
| particular, the act of running the Work is not restricted and no |
| requirements are made concerning any offers of support for the Work. |
| |
| 2. You may distribute a complete, unmodified copy of the Work as you |
| received it. Distribution of only part of the Work is considered |
| modification of the Work, and no right to distribute such a Derived |
| Work may be assumed under the terms of this clause. |
| |
| 3. You may distribute a Compiled Work that has been generated from a |
| complete, unmodified copy of the Work as distributed under Clause 2 |
| above, as long as that Compiled Work is distributed in such a way that |
| the recipients may install the Compiled Work on their system exactly |
| as it would have been installed if they generated a Compiled Work |
| directly from the Work. |
| |
| 4. If you are the Current Maintainer of the Work, you may, without |
| restriction, modify the Work, thus creating a Derived Work. You may |
| also distribute the Derived Work without restriction, including |
| Compiled Works generated from the Derived Work. Derived Works |
| distributed in this manner by the Current Maintainer are considered to |
| be updated versions of the Work. |
| |
| 5. If you are not the Current Maintainer of the Work, you may modify |
| your copy of the Work, thus creating a Derived Work based on the Work, |
| and compile this Derived Work, thus creating a Compiled Work based on |
| the Derived Work. |
| |
| 6. If you are not the Current Maintainer of the Work, you may |
| distribute a Derived Work provided the following conditions are met |
| for every component of the Work unless that component clearly states |
| in the copyright notice that it is exempt from that condition. Only |
| the Current Maintainer is allowed to add such statements of exemption |
| to a component of the Work. |
| |
| a. If a component of this Derived Work can be a direct replacement |
| for a component of the Work when that component is used with the |
| Base Interpreter, then, wherever this component of the Work |
| identifies itself to the user when used interactively with that |
| Base Interpreter, the replacement component of this Derived Work |
| clearly and unambiguously identifies itself as a modified version |
| of this component to the user when used interactively with that |
| Base Interpreter. |
| |
| b. Every component of the Derived Work contains prominent notices |
| detailing the nature of the changes to that component, or a |
| prominent reference to another file that is distributed as part |
| of the Derived Work and that contains a complete and accurate log |
| of the changes. |
| |
| c. No information in the Derived Work implies that any persons, |
| including (but not limited to) the authors of the original version |
| of the Work, provide any support, including (but not limited to) |
| the reporting and handling of errors, to recipients of the |
| Derived Work unless those persons have stated explicitly that |
| they do provide such support for the Derived Work. |
| |
| d. You distribute at least one of the following with the Derived Work: |
| |
| 1. A complete, unmodified copy of the Work; |
| if your distribution of a modified component is made by |
| offering access to copy the modified component from a |
| designated place, then offering equivalent access to copy |
| the Work from the same or some similar place meets this |
| condition, even though third parties are not compelled to |
| copy the Work along with the modified component; |
| |
| 2. Information that is sufficient to obtain a complete, |
| unmodified copy of the Work. |
| |
| 7. If you are not the Current Maintainer of the Work, you may |
| distribute a Compiled Work generated from a Derived Work, as long as |
| the Derived Work is distributed to all recipients of the Compiled |
| Work, and as long as the conditions of Clause 6, above, are met with |
| regard to the Derived Work. |
| |
| 8. The conditions above are not intended to prohibit, and hence do not |
| apply to, the modification, by any method, of any component so that it |
| becomes identical to an updated version of that component of the Work as |
| it is distributed by the Current Maintainer under Clause 4, above. |
| |
| 9. Distribution of the Work or any Derived Work in an alternative |
| format, where the Work or that Derived Work (in whole or in part) is |
| then produced by applying some process to that format, does not relax or |
| nullify any sections of this license as they pertain to the results of |
| applying that process. |
| |
| 10. a. A Derived Work may be distributed under a different license |
| provided that license itself honors the conditions listed in |
| Clause 6 above, in regard to the Work, though it does not have |
| to honor the rest of the conditions in this license. |
| |
| b. If a Derived Work is distributed under a different license, that |
| Derived Work must provide sufficient documentation as part of |
| itself to allow each recipient of that Derived Work to honor the |
| restrictions in Clause 6 above, concerning changes from the Work. |
| |
| 11. This license places no restrictions on works that are unrelated to |
| the Work, nor does this license place any restrictions on aggregating |
| such works with the Work by any means. |
| |
| 12. Nothing in this license is intended to, or may be used to, prevent |
| complete compliance by all parties with all applicable laws. |
| |
| |
| NO WARRANTY |
| =========== |
| |
| There is no warranty for the Work. Except when otherwise stated in |
| writing, the Copyright Holder provides the Work `as is', without |
| warranty of any kind, either expressed or implied, including, but not |
| limited to, the implied warranties of merchantability and fitness for a |
| particular purpose. The entire risk as to the quality and performance |
| of the Work is with you. Should the Work prove defective, you assume |
| the cost of all necessary servicing, repair, or correction. |
| |
| In no event unless required by applicable law or agreed to in writing |
| will The Copyright Holder, or any author named in the components of the |
| Work, or any other party who may distribute and/or modify the Work as |
| permitted above, be liable to you for damages, including any general, |
| special, incidental or consequential damages arising out of any use of |
| the Work or out of inability to use the Work (including, but not limited |
| to, loss of data, data being rendered inaccurate, or losses sustained by |
| anyone as a result of any failure of the Work to operate with any other |
| programs), even if the Copyright Holder or said author or said other |
| party has been advised of the possibility of such damages. |
| |
| |
| MAINTENANCE OF THE WORK |
| ======================= |
| |
| The Work has the status `author-maintained' if the Copyright Holder |
| explicitly and prominently states near the primary copyright notice in |
| the Work that the Work can only be maintained by the Copyright Holder |
| or simply that it is `author-maintained'. |
| |
| The Work has the status `maintained' if there is a Current Maintainer |
| who has indicated in the Work that they are willing to receive error |
| reports for the Work (for example, by supplying a valid e-mail |
| address). It is not required for the Current Maintainer to acknowledge |
| or act upon these error reports. |
| |
| The Work changes from status `maintained' to `unmaintained' if there |
| is no Current Maintainer, or the person stated to be Current |
| Maintainer of the work cannot be reached through the indicated means |
| of communication for a period of six months, and there are no other |
| significant signs of active maintenance. |
| |
| You can become the Current Maintainer of the Work by agreement with |
| any existing Current Maintainer to take over this role. |
| |
| If the Work is unmaintained, you can become the Current Maintainer of |
| the Work through the following steps: |
| |
| 1. Make a reasonable attempt to trace the Current Maintainer (and |
| the Copyright Holder, if the two differ) through the means of |
| an Internet or similar search. |
| |
| 2. If this search is successful, then enquire whether the Work |
| is still maintained. |
| |
| a. If it is being maintained, then ask the Current Maintainer |
| to update their communication data within one month. |
| |
| b. If the search is unsuccessful or no action to resume active |
| maintenance is taken by the Current Maintainer, then announce |
| within the pertinent community your intention to take over |
| maintenance. (If the Work is a LaTeX work, this could be |
| done, for example, by posting to comp.text.tex.) |
| |
| 3a. If the Current Maintainer is reachable and agrees to pass |
| maintenance of the Work to you, then this takes effect |
| immediately upon announcement. |
| |
| b. If the Current Maintainer is not reachable and the Copyright |
| Holder agrees that maintenance of the Work be passed to you, |
| then this takes effect immediately upon announcement. |
| |
| 4. If you make an `intention announcement' as described in 2b. above |
| and after three months your intention is challenged neither by |
| the Current Maintainer nor by the Copyright Holder nor by other |
| people, then you may arrange for the Work to be changed so as |
| to name you as the (new) Current Maintainer. |
| |
| 5. If the previously unreachable Current Maintainer becomes |
| reachable once more within three months of a change completed |
| under the terms of 3b) or 4), then that Current Maintainer must |
| become or remain the Current Maintainer upon request provided |
| they then update their communication data within one month. |
| |
| A change in the Current Maintainer does not, of itself, alter the fact |
| that the Work is distributed under the LPPL license. |
| |
| If you become the Current Maintainer of the Work, you should |
| immediately provide, within the Work, a prominent and unambiguous |
| statement of your status as Current Maintainer. You should also |
| announce your new status to the same pertinent community as |
| in 2b) above. |
| |
| |
| WHETHER AND HOW TO DISTRIBUTE WORKS UNDER THIS LICENSE |
| ====================================================== |
| |
| This section contains important instructions, examples, and |
| recommendations for authors who are considering distributing their |
| works under this license. These authors are addressed as `you' in |
| this section. |
| |
| Choosing This License or Another License |
| ---------------------------------------- |
| |
| If for any part of your work you want or need to use *distribution* |
| conditions that differ significantly from those in this license, then |
| do not refer to this license anywhere in your work but, instead, |
| distribute your work under a different license. You may use the text |
| of this license as a model for your own license, but your license |
| should not refer to the LPPL or otherwise give the impression that |
| your work is distributed under the LPPL. |
| |
| The document `modguide.tex' in the base LaTeX distribution explains |
| the motivation behind the conditions of this license. It explains, |
| for example, why distributing LaTeX under the GNU General Public |
| License (GPL) was considered inappropriate. Even if your work is |
| unrelated to LaTeX, the discussion in `modguide.tex' may still be |
| relevant, and authors intending to distribute their works under any |
| license are encouraged to read it. |
| |
| A Recommendation on Modification Without Distribution |
| ----------------------------------------------------- |
| |
| It is wise never to modify a component of the Work, even for your own |
| personal use, without also meeting the above conditions for |
| distributing the modified component. While you might intend that such |
| modifications will never be distributed, often this will happen by |
| accident -- you may forget that you have modified that component; or |
| it may not occur to you when allowing others to access the modified |
| version that you are thus distributing it and violating the conditions |
| of this license in ways that could have legal implications and, worse, |
| cause problems for the community. It is therefore usually in your |
| best interest to keep your copy of the Work identical with the public |
| one. Many works provide ways to control the behavior of that work |
| without altering any of its licensed components. |
| |
| How to Use This License |
| ----------------------- |
| |
| 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. |
| |
| Here is an example of such a notice and statement: |
| |
| %% pig.dtx |
| %% Copyright 2005 M. Y. Name |
| % |
| % This work may be distributed and/or modified under the |
| % conditions of the LaTeX Project Public License, either version 1.3 |
| % of this license or (at your option) any later version. |
| % The latest version of this license is in |
| % http://www.latex-project.org/lppl.txt |
| % and version 1.3 or later is part of all distributions of LaTeX |
| % version 2005/12/01 or later. |
| % |
| % This work has the LPPL maintenance status `maintained'. |
| % |
| % The Current Maintainer of this work is M. Y. Name. |
| % |
| % This work consists of the files pig.dtx and pig.ins |
| % and the derived file pig.sty. |
| |
| Given such a notice and statement in a file, the conditions |
| given in this license document would apply, with the `Work' referring |
| to the three files `pig.dtx', `pig.ins', and `pig.sty' (the last being |
| generated from `pig.dtx' using `pig.ins'), the `Base Interpreter' |
| referring to any `LaTeX-Format', and both `Copyright Holder' and |
| `Current Maintainer' referring to the person `M. Y. Name'. |
| |
| If you do not want the Maintenance section of LPPL to apply to your |
| Work, change `maintained' above into `author-maintained'. |
| However, we recommend that you use `maintained', as the Maintenance |
| section was added in order to ensure that your Work remains useful to |
| the community even when you can no longer maintain and support it |
| yourself. |
| |
| Derived Works That Are Not Replacements |
| --------------------------------------- |
| |
| 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. |
| |
| |
| Important Recommendations |
| ------------------------- |
| |
| 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: |
| |
| % This work consists of all files listed in manifest.txt. |
| |
| 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 |
| the Work. |
| |