Location: CTAN License The LaTeX Project Public License 1.3c https://www.ctan.org/license/lppl1.3c The LaTeX Project Public Li��cense LPPL Ver��sion 1.3c 2008-05-04 Copy��right 1999 2002-2008 LaTeX3 Project Every��one is al��lowed to dis��tribute ver��ba��tim copies of this li��cense doc��u��ment, but mod��i��fi��ca��tion of it is not al��lowed. PREAMBLE The LaTeX Project Public Li��cense (LPPL) is the pri��mary li��cense un��der which the LaTeX ker��nel and the base LaTeX pack��ages are dis��tributed. You may use this li��cense for any work of which you hold the copy��right and which you wish to dis��tribute. This li��cense may be par��tic��u��larly suit��able if your work is TeX-re��lated (such as a LaTeX pack��age), but it is writ��ten in such a way that you can use it even if your work is un��re��lated to TeX. The sec��tion ���WHETHER AND HOW TO DISTRIBUTE WORKS UNDER THIS LICENSE���, be��low, gives in��struc��tions, ex��am��ples, and rec��om��men��da��tions for au��thors who are con��sid��er��ing dis��tribut��ing their works un��der this li��cense. This li��cense gives con��di��tions un��der which a work may be dis��tributed and mod��i��fied, as well as con��di��tions un��der which mod��i��fied ver��sions of that work may be dis��tributed. We, the LaTeX3 Project, be��lieve that the con��di��tions be��low give you the free��dom to make and dis��tribute mod��i��fied ver��sions of your work that con��form with what��ever tech��ni��cal spec��i��fi��ca��tions you wish while main��tain��ing the avail��abil��ity, in��tegrity, and re��li��a��bil��ity of that work. If you do not see how to achieve your goal while meet��ing these con��di��tions, then read the doc��u��ment ���cfg��guide.tex��� and ���mod��guide.tex��� in the base LaTeX dis��tri��bu��tion for sug��ges��tions. DEFINITIONS In this li��cense doc��u��ment the fol��low��ing terms are used: ���Work��� Any work be��ing dis��tributed un��der this Li��cense. ���Derived Work��� Any work that un��der any ap��pli��ca��ble law is de��rived from the Work. ���Mod��i��fi��ca��tion��� Any pro��ce��dure that pro��duces a Derived Work un��der any ap��pli��ca��ble law ��� for ex��am��ple, the pro��duc��tion of a file con��tain��ing an orig��i��nal file as��so��ci��ated with the Work or a sig��nif��i��cant por��tion of such a file, ei��ther ver��ba��tim or with mod��i��fi��ca��tions and/or trans��lated into an��other lan��guage. ���Mod��ify��� To ap��ply any pro��ce��dure that pro��duces a Derived Work un��der any ap��pli��ca��ble law. ���Distri��bu��tion��� Mak��ing copies of the Work avail��able from one per��son to an��other, in whole or in part. Distri��bu��tion in��cludes (but is not lim��ited to) mak��ing any elec��tronic com��po��nents of the Work ac��ces��si��ble by file trans��fer pro��to��cols such as FTP or HTTP or by shared file sys��tems such as Sun's Net��work File Sys��tem (NFS). ���Com��piled Work��� A ver��sion of the Work that has been pro��cessed into a form where it is di��rectly us��able on a com��puter sys��tem. This pro��cess��ing may in��clude us��ing in��stal��la��tion fa��cil��i��ties pro��vided by the Work, trans��for��ma��tions of the Work, copy��ing of com��po��nents of the Work, or other ac��tiv��i��ties. Note that mod��i��fi��ca��tion of any in��stal��la��tion fa��cil��i��ties pro��vided by the Work con��sti��tutes mod��i��fi��ca��tion of the Work. ���Cur��rent Main��tainer��� A per��son or per��sons nom��i��nated as such within the Work. If there is no such ex��plicit nom��i��na��tion then it is the ���Copy��right Holder��� un��der any ap��pli��ca��ble law. ���Base In��ter��preter��� A pro��gram or pro��cess that is nor��mally needed for run��ning or in��ter��pret��ing a part or the whole of the Work. A Base In��ter��preter may de��pend on ex��ter��nal com��po��nents but these are not con��sid��ered part of the Base In��ter��preter pro��vided that each ex��ter��nal com��po��nent clearly iden��ti��fies it��self when��ever it is used in��ter��ac��tively. Un��less ex��plic��itly spec��i��fied when ap��ply��ing the li��cense to the Work, the only ap��pli��ca��ble Base In��ter��preter is a ���LaTeX-For��mat��� or in the case of files be��long��ing to the ���LaTeX-for��mat��� a pro��gram im��ple��ment��ing the ���TeX lan��guage���. CONDITIONS ON DISTRIBUTION AND MODIFICATION Ac��tiv��i��ties other than dis��tri��bu��tion and/or mod��i��fi��ca��tion of the Work are not cov��ered by this li��cense; they are out��side its scope. In par��tic��u��lar, the act of run��ning the Work is not re��stricted and no re��quire��ments are made con��cern��ing any of��fers of sup��port for the Work. You may dis��tribute a com��plete, un��mod��i��fied copy of the Work as you re��ceived it. Distri��bu��tion of only part of the Work is con��sid��ered mod��i��fi��ca��tion of the Work, and no right to dis��tribute such a Derived Work may be as��sumed un��der the terms of this clause. You may dis��tribute a Com��piled Work that has been gen��er��ated from a com��plete, un��mod��i��fied copy of the Work as dis��tributed un��der Clause 2 above, as long as that Com��piled Work is dis��tributed in such a way that the re��cip��i��ents may in��stall the Com��piled Work on their sys��tem ex��actly as it would have been in��stalled if they gen��er��ated a Com��piled Work di��rectly from the Work. If you are the Cur��rent Main��tainer of the Work, you may, with��out re��stric��tion, mod��ify the Work, thus cre��at��ing a Derived Work. You may also dis��tribute the Derived Work with��out re��stric��tion, in��clud��ing Com��piled Works gen��er��ated from the Derived Work. Derived Works dis��tributed in this man��ner by the Cur��rent Main��tainer are con��sid��ered to be up��dated ver��sions of the Work. If you are not the Cur��rent Main��tainer of the Work, you may mod��ify your copy of the Work, thus cre��at��ing a Derived Work based on the Work, and com��pile this Derived Work, thus cre��at��ing a Com��piled Work based on the Derived Work. If you are not the Cur��rent Main��tainer of the Work, you may dis��tribute a Derived Work pro��vided the fol��low��ing con��di��tions are met for ev��ery com��po��nent of the Work un��less that com��po��nent clearly states in the copy��right no��tice that it is ex��empt from that con��di��tion. Only the Cur��rent Main��tainer is al��lowed to add such state��ments of ex��emp��tion to a com��po��nent of the Work. If a com��po��nent of this Derived Work can be a di��rect re��place��ment for a com��po��nent of the Work when that com��po��nent is used with the Base In��ter��preter, then, wher��ever this com��po��nent of the Work iden��ti��fies it��self to the user when used in��ter��ac��tively with that Base In��ter��preter, the re��place��ment com��po��nent of this Derived Work clearly and un��am��bigu��ously iden��ti��fies it��self as a mod��i��fied ver��sion of this com��po��nent to the user when used in��ter��ac��tively with that Base In��ter��preter. Every com��po��nent of the Derived Work con��tains promi��nent no��tices de��tail��ing the na��ture of the changes to that com��po��nent, or a promi��nent ref��er��ence to an��other file that is dis��tributed as part of the Derived Work and that con��tains a com��plete and ac��cu��rate log of the changes. No in��for��ma��tion in the Derived Work im��plies that any per��sons, in��clud��ing (but not lim��ited to) the au��thors of the orig��i��nal ver��sion of the Work, pro��vide any sup��port, in��clud��ing (but not lim��ited to) the re��port��ing and han��dling of er��rors, to re��cip��i��ents of the Derived Work un��less those per��sons have stated ex��plic��itly that they do pro��vide such sup��port for the Derived Work. You dis��tribute at least one of the fol��low��ing with the Derived Work: A com��plete, un��mod��i��fied copy of the Work; if your dis��tri��bu��tion of a mod��i��fied com��po��nent is made by of��fer��ing ac��cess to copy the mod��i��fied com��po��nent from a des��ig��nated place, then of��fer��ing equiv��a��lent ac��cess to copy the Work from the same or some sim��i��lar place meets this con��di��tion, even though third par��ties are not com��pelled to copy the Work along with the mod��i��fied com��po��nent; In��for��ma��tion that is suf��fi��cient to ob��tain a com��plete, un��mod��i��fied copy of the Work. If you are not the Cur��rent Main��tainer of the Work, you may dis��tribute a Com��piled Work gen��er��ated from a Derived Work, as long as the Derived Work is dis��tributed to all re��cip��i��ents of the Com��piled Work, and as long as the con��di��tions of Clause 6, above, are met with re��gard to the Derived Work. The con��di��tions above are not in��tended to pro��hibit, and hence do not ap��ply to, the mod��i��fi��ca��tion, by any method, of any com��po��nent so that it be��comes iden��ti��cal to an up��dated ver��sion of that com��po��nent of the Work as it is dis��tributed by the Cur��rent Main��tainer un��der Clause 4, above. Distri��bu��tion of the Work or any Derived Work in an al��ter��na��tive for��mat, where the Work or that Derived Work (in whole or in part) is then pro��duced by ap��ply��ing some pro��cess to that for��mat, does not re��lax or nul��lify any sec��tions of this li��cense as they per��tain to the re��sults of ap��ply��ing that pro��cess. A Derived Work may be dis��tributed un��der a dif��fer��ent li��cense pro��vided that li��cense it��self hon��ors the con��di��tions listed in Clause 6 above, in re��gard to the Work, though it does not have to honor the rest of the con��di��tions in this li��cense. If a Derived Work is dis��tributed un��der a dif��fer��ent li��cense, that Derived Work must pro��vide suf��fi��cient doc��u��men��ta��tion as part of it��self to al��low each re��cip��i��ent of that Derived Work to honor the re��stric��tions in Clause 6 above, con��cern��ing changes from the Work. This li��cense places no re��stric��tions on works that are un��re��lated to the Work, nor does this li��cense place any re��stric��tions on ag��gre��gat��ing such works with the Work by any means. Noth��ing in this li��cense is in��tended to, or may be used to, pre��vent com��plete com��pli��ance by all par��ties with all ap��pli��ca��ble laws. NO WARRANTY There is no war��ranty for the Work. Ex��cept when oth��er��wise stated in writ��ing, the Copy��right Holder pro��vides the Work ���as is���, with��out war��ranty of any kind, ei��ther ex��pressed or im��plied, in��clud��ing, but not lim��ited to, the im��plied war��ranties of mer��chantabil��ity and fit��ness for a par��tic��u��lar pur��pose. The en��tire risk as to the qual��ity and per��for��mance of the Work is with you. Should the Work prove de��fec��tive, you as��sume the cost of all nec��es��sary ser��vic��ing, re��pair, or cor��rec��tion. In no event un��less re��quired by ap��pli��ca��ble law or agreed to in writ��ing will The Copy��right Holder, or any au��thor named in the com��po��nents of the Work, or any other party who may dis��tribute and/or mod��ify the Work as per��mit��ted above, be li��able to you for dam��ages, in��clud��ing any gen��eral, spe��cial, in��ci��den��tal or con��se��quen��tial dam��ages aris��ing out of any use of the Work or out of in��abil��ity to use the Work (in��clud��ing, but not lim��ited to, loss of data, data be��ing ren��dered in��ac��cu��rate, or losses sus��tained by any��one as a re��sult of any fail��ure of the Work to op��er��ate with any other pro��grams), even if the Copy��right Holder or said au��thor or said other party has been ad��vised of the pos��si��bil��ity of such dam��ages. MAINTENANCE OF THE WORK The Work has the sta��tus ���au��thor-main��tained��� if the Copy��right Holder ex��plic��itly and promi��nently states near the pri��mary copy��right no��tice in the Work that the Work can only be main��tained by the Copy��right Holder or sim��ply that it is ���au��thor-main��tained���. The Work has the sta��tus ���main��tained��� if there is a Cur��rent Main��tainer who has in��di��cated in the Work that they are will��ing to re��ceive er��ror re��ports for the Work (for ex��am��ple, by sup��ply��ing a valid e-mail ad��dress). It is not re��quired for the Cur��rent Main��tainer to ac��knowl��edge or act upon these er��ror re��ports. The Work changes from sta��tus ���main��tained��� to ���un��main��tained��� if there is no Cur��rent Main��tainer, or the per��son stated to be Cur��rent Main��tainer of the work can��not be reached through the in��di��cated means of com��mu��ni��ca��tion for a pe��riod of six months, and there are no other sig��nif��i��cant signs of ac��tive main��te��nance. You can be��come the Cur��rent Main��tainer of the Work by agree��ment with any ex��ist��ing Cur��rent Main��tainer to take over this role. If the Work is un��main��tained, you can be��come the Cur��rent Main��tainer of the Work through the fol��low��ing steps: Make a rea��son��able at��tempt to trace the Cur��rent Main��tainer (and the Copy��right Holder, if the two dif��fer) through the means of an In��ter��net or sim��i��lar search. If this search is suc��cess��ful, then en��quire whether the Work is still main��tained. If it is be��ing main��tained, then ask the Cur��rent Main��tainer to up��date their com��mu��ni��ca��tion data within one month. If the search is un��suc��cess��ful or no ac��tion to re��sume ac��tive main��te��nance is taken by the Cur��rent Main��tainer, then an��nounce within the per��ti��nent com��mu��nity your in��ten��tion to take over main��te��nance. (If the Work is a LaTeX work, this could be done, for ex��am��ple, by post��ing to comp.text.tex.) If the Cur��rent Main��tainer is reach��able and agrees to pass main��te��nance of the Work to you, then this takes ef��fect im��me��di��ately upon an��nounce��ment. If the Cur��rent Main��tainer is not reach��able and the Copy��right Holder agrees that main��te��nance of the Work be passed to you, then this takes ef��fect im��me��di��ately upon an��nounce��ment. If you make an ���in��ten��tion an��nounce��ment��� as de��scribed in 2b. above and af��ter three months your in��ten��tion is chal��lenged nei��ther by the Cur��rent Main��tainer nor by the Copy��right Holder nor by other peo��ple, then you may ar��range for the Work to be changed so as to name you as the (new) Cur��rent Main��tainer. If the pre��vi��ously un��reach��able Cur��rent Main��tainer be��comes reach��able once more within three months of a change com��pleted un��der the terms of 3b) or 4), then that Cur��rent Main��tainer must be��come or re��main the Cur��rent Main��tainer upon re��quest pro��vided they then up��date their com��mu��ni��ca��tion data within one month. A change in the Cur��rent Main��tainer does not, of it��self, al��ter the fact that the Work is dis��tributed un��der the LPPL li��cense. If you be��come the Cur��rent Main��tainer of the Work, you should im��me��di��ately pro��vide, within the Work, a promi��nent and un��am��bigu��ous state��ment of your sta��tus as Cur��rent Main��tainer. You should also an��nounce your new sta��tus to the same per��ti��nent com��mu��nity as in 2b) above. WHETHER AND HOW TO DISTRIBUTE WORKS UNDER THIS LICENSE This sec��tion con��tains im��por��tant in��struc��tions, ex��am��ples, and rec��om��men��da��tions for au��thors who are con��sid��er��ing dis��tribut��ing their works un��der this li��cense. Th��ese au��thors are ad��dressed as ���you��� in this sec��tion. Choos��ing This Li��cense or Another Li��cense If for any part of your work you want or need to use *dis��tri��bu��tion* con��di��tions that dif��fer sig��nif��i��cantly from those in this li��cense, then do not re��fer to this li��cense any��where in your work but, in��stead, dis��tribute your work un��der a dif��fer��ent li��cense. You may use the text of this li��cense as a model for your own li��cense, but your li��cense should not re��fer to the LPPL or oth��er��wise give the im��pres��sion that your work is dis��tributed un��der the LPPL. The doc��u��ment ���mod��guide.tex��� in the base LaTeX dis��tri��bu��tion ex��plains the mo��ti��va��tion be��hind the con��di��tions of this li��cense. It ex��plains, for ex��am��ple, why dis��tribut��ing LaTeX un��der the GNU Gen��eral Public Li��cense (GPL) was con��sid��ered in��ap��pro��pri��ate. Even if your work is un��re��lated to LaTeX, the dis��cus��sion in ���mod��guide.tex��� may still be rel��e��vant, and au��thors in��tend��ing to dis��tribute their works un��der any li��cense are en��cour��aged to read it. A Rec��om��men��da��tion on Mod��i��fi��ca��tion Without Distri��bu��tion It is wise never to mod��ify a com��po��nent of the Work, even for your own per��sonal use, with��out also meet��ing the above con��di��tions for dis��tribut��ing the mod��i��fied com��po��nent. While you might in��tend that such mod��i��fi��ca��tions will never be dis��tributed, of��ten this will hap��pen by ac��ci��dent ��� you may for��get that you have mod��i��fied that com��po��nent; or it may not oc��cur to you when al��low��ing oth��ers to ac��cess the mod��i��fied ver��sion that you are thus dis��tribut��ing it and vi��o��lat��ing the con��di��tions of this li��cense in ways that could have le��gal im��pli��ca��tions and, worse, cause prob��lems for the com��mu��nity. It is there��fore usu��ally in your best in��ter��est to keep your copy of the Work iden��ti��cal with the pub��lic one. Many works pro��vide ways to con��trol the be��hav��ior of that work with��out al��ter��ing any of its li��censed com��po��nents. How to Use This Li��cense To use this li��cense, place in each of the com��po��nents of your work both an ex��plicit copy��right no��tice in��clud��ing your name and the year the work was au��thored and/or last sub��stan��tially mod��i��fied. In��clude also a state��ment that the dis��tri��bu��tion and/or mod��i��fi��ca��tion of that com��po��nent is con��strained by the con��di��tions in this li��cense. Here is an ex��am��ple of such a no��tice and state��ment: %% 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 no��tice and state��ment in a file, the con��di��tions given in this li��cense doc��u��ment would ap��ply, with the ���Work��� re��fer��ring to the three files ���pig.dtx���, ���pig.ins���, and ���pig.sty��� (the last be��ing gen��er��ated from ���pig.dtx��� us��ing ���pig.ins���), the ���Base In��ter��preter��� re��fer��ring to any ���LaTeX-For��mat���, and both ���Copy��right Holder��� and ���Cur��rent Main��tainer��� re��fer��ring to the per��son ���M. Y. Name���. If you do not want the Main��te��nance sec��tion of LPPL to ap��ply to your Work, change ���main��tained��� above into ���au��thor-main��tained���. How��ever, we rec��om��mend that you use ���main��tained���, as the Main��te��nance sec��tion was added in or��der to en��sure that your Work re��mains use��ful to the com��mu��nity even when you can no longer main��tain and sup��port it your��self. Derived Works That Are Not Re��place��ments Sev��eral clauses of the LPPL spec��ify means to pro��vide re��li��a��bil��ity and sta��bil��ity for the user com��mu��nity. They there��fore con��cern them��selves with the case that a Derived Work is in��tended to be used as a (com��pat��i��ble or in��com��pat��i��ble) re��place��ment of the orig��i��nal Work. If this is not the case (e.g., if a few lines of code are reused for a com��pletely dif��fer��ent task), then clauses 6b and 6d shall not ap��ply. Im��por��tant Rec��om��men��da��tions Defin��ing What Con��sti��tutes the Work The LPPL re��quires that dis��tri��bu��tions of the Work con��tain all the files of the Work. It is there��fore im��por��tant that you pro��vide a way for the li��censee to de��ter��mine which files con��sti��tute the Work. This could, for ex��am��ple, be achieved by ex��plic��itly list��ing all the files of the Work near the copy��right no��tice of each file or by us��ing a line such as: % This work consists of all files listed in manifest.txt. in that place. In the ab��sence of an un��equiv��o��cal list it might be im��pos��si��ble for the li��censee to de��ter��mine what is con��sid��ered by you to com��prise the Work and, in such a case, the li��censee would be en��ti��tled to make rea��son��able con��jec��tures as to which files com��prise the Work.