90 Trademark and License Information

GNU General Public License
Version 2, June 1991
Copyright(C)1989,1991 FreeSoftwareFoundation,In c.
   675MassAve,Cambridge,MA02139,USA
Everyoneispermittedtocopyanddis tributeverbatimcopiesofthislicen sedocument,butchangingitisnotall owed.
Preamble
Thelicensesformostsoftwar earedesignedtotakeawayyourfreedomtosha reandchangeit.Bycontrast,theGNUG eneralPublicLicenseisintend edto
guaranteeyourfreedomtoshareandc hangefreesoftware--tomakesu rethesoftwareisfreeforallitsus ers.ThisGeneralPublicLice nseappliestomostofthe
FreeSoftwareFoundation’ssoftwarea ndtoanyotherprogramwhoseauthorsc ommittousingit.(SomeotherFreeSoft wareFoundationsoftwareiscovere dby
theGNULibraryGeneralPubli cLicenseinstead.)Youcanapplyittoyourprogra ms,too.
Whenwespeakoffreesoftware,wearer eferringtofreedom,notprice.Ou rGeneralPublicLicensesarede signedtomakesurethatyouhavethefreedomtodi s-
tributecopiesoffreesoftware(a ndchargeforthisserviceifyouwis h),thatyoureceivesourcecodeorcangetitifyo uwantit,thatyoucanchangethesoftwa re
orusepiecesofitinnewfreeprogra ms;andthatyouknowyoucandothesethings.
Toprotectyourrights,weneedtomakerestrictio nsthatforbidanyonetodenyyoutheserightso rtoaskyoutosurrendertherights.The serestrictionstranslate
tocertainresponsibilitiesf oryouifyoudistributecopiesofthesoft ware,orifyoumodifyit.
Forexample,ifyoudistributecopiesofsuc haprogram,whethergratisorforafee,yo umustgivetherecipientsalltheright sthatyouhave.Youmustmakesure
thatthey,too,receiveorcangetthesourcecode.A ndyoumustshowthemthesetermssotheykn owtheirrights.
Weprotectyourrightswithtwosteps:(1)copyrightthes oftware,and(2)offeryouthislicen sewhichgivesyoulegalpermissio ntocopy,distributeand/ormodify
thesoftware.
Also,foreachauthor’sprotectionandour s,wewanttomakecertainthateveryon eunderstandsthatthereisnowar rantyforthisfreesoftware.Ifth esoftwareis
modifiedbysomeoneelseandpas sedon,wewantitsrecipientstoknowthatwh attheyhaveisnottheoriginal,sothatanyprobl emsintroducedbyotherswill
notreflectontheoriginalauthor s’reputations.
Finally,anyfreeprogramisthreatenedco nstantlybysoftwarepatents.Wewis htoavoidthedangerthatredistributor sofafreeprogramwillindividuallyo btain
patentlicenses,ineffectmak ingtheprogramproprietar y.Topreventthis,wehavemadeitclearthatanypatentmustbelice nsedforeveryone’sfreeuseornot
licensedatall.
Theprecisetermsandcondition sforcopying,distributionandmodicationfollow.
GNU GENERAL PUBLIC LIC ENSE
TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
0.ThisLicenseappliestoanyprogra morotherworkwhichcontainsanoticep lacedbythecopyrightholdersayin gitmaybedistributedunderthetermsofth is
GeneralPublicLicense.The“Pr ogram”,below,referstoanysuchprogramorwork,an da“workbasedontheProgram”meansei thertheProgramoranyderiva-
tiveworkundercopyrightlaw:thatistosay,aworkconta iningtheProgramoraportionofit,e itherverbatimorwithmodificati onsand/ortranslatedintoanother
language.(Hereinafter,translati onisincludedwithoutlimitationi ntheterm“modification”.)Eachlicenseeisadd ressedas“you”.
Activitiesotherthancopying,distr ibutionandmodificationarenotc overedbythisLicense;theyareoutsideit sscope.TheactofrunningtheProgra misnot
restricted,andtheoutputfromthePr ogramiscoveredonlyifitscontentsco nstituteaworkbasedontheProgram(i ndependentofhavingbeenmadebyru nning
theProgram).Whetherthatistruedepe ndsonwhattheProgramdoes.
1.YoumaycopyanddistributeverbatimcopiesoftheProgra m’ssourcecodeasyoureceiveit,inanymedium,p rovidedthatyouconspicuouslyanda ppropri-
atelypublishoneachcopyanappropr iatecopyrightnoticeanddisclaime rofwarranty;keepintactallthenoti cesthatrefertothisLicenseandtotheab senceof
anywarranty;andgiveanyotherrecip ientsoftheProgramacopyofthisLicens ealongwiththeProgram.
Youmaychargeafeeforthephysicalactoftransfe rringacopy,andyoumayatyouroptionofferwarra ntyprotectioninexchangeforafee.
2.YoumaymodifyyourcopyorcopiesoftheProgramora nyportionofit,thusformingaworkbas edontheProgram,andcopyanddistrib utesuchmodifica-
tionsorworkunderthetermsofSectio n1above,providedthatyoualsomeetallofthe seconditions:
a)Youmustcausethemodifiedfilestocarr yprominentnoticesstatingthatyo uchangedthefilesandthedateofanychan ge.
b)Youmustcauseanyworkthatyoudistributeorpublis h,thatinwholeorinpartcontainsori sderivedfromtheProgramoranypar tthereof,tobelicensed
asawholeatnochargetoallthirdparti esunderthetermsofthisLicense.
c)Ifthemodifiedprogramnormall yreadscommandsinteractivelywh enrun,youmustcauseit,whenstar tedrunningforsuchinteractiveusei nthe
mostordinaryway,toprintordisplayananno uncementincludinganappropr iatecopyrightnoticeandanoticethatth ereisnowarranty(orelse,saying
thatyouprovideawarranty)andthatus ersmayredistributetheprogramu ndertheseconditions,andtellingt heuserhowtoviewacopyofthisLicense.
(Exception:iftheProgramitselfisinte ractivebutdoesnotnormallypri ntsuchanannouncement,yourworkba sedontheProgramisnotrequiredtopr int
anannouncement.)
Theserequirementsapplytothemo difiedworkasawhole.Ifidentifiab lesectionsofthatworkarenotderive dfromtheProgram,andcanbereason ablyconsid-
eredindependentandsepara teworksinthemselves,thenthisLicen se,anditsterms,donotapplytothosese ctionswhenyoudistributethemassep arateworks.
Butwhenyoudistributethesamesect ionsaspartofawholewhichisaworkba sedontheProgram,thedistributiono fthewholemustbeonthetermsofthis
License,whosepermissionsf orotherlicenseesextendtotheenti rewhole,andthustoeachandeverypar tregardlessofwhowroteit.
Thus,itisnottheintentofthissectiontocl aimrightsorcontestyourrightstoworkw rittenentirelybyyou;rather,theintentistoexercis etherighttocontrolthe
distributionofderivativeorcollec tiveworksbasedontheProgram.
Inaddition,mereaggregationofanot herworknotbasedontheProgramwithth eProgram(orwithaworkbasedontheProgr am)onavolumeofastorageor
distributionmediumdoesnotbrin g��theotherworkunderthescopeofthisLic ense.
3.YoumaycopyanddistributetheProgram(oraworkbase donit,underSection2)inobjectcod eorexecutableformunderthetermsofSe ctions1and2above
providedthatyoualsodooneofthefollowing:
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