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1、GNUGENERALPUBLICLICENSEVersion2June1991Copyright(C)19891991FreeSoftwareFoundationInc.51FranklinStreetFifthFloBostonMA021101301USAEveryoneispermittedtocopydistributeverbatimcopiesofthislicensedocumentbutchangingitisnotall
2、owed.PreambleThelicensesfmostsoftwarearedesignedtotakeawayyourfreedomtosharechangeit.BycontrasttheGNUGeneralPublicLicenseisintendedtoguaranteeyourfreedomtosharechangefreesoftwaretomakesurethesoftwareisfreefallitsusers.Th
3、isGeneralPublicLicenseappliestomostoftheFreeSoftwareFoundationssoftwaretoanyotherprogramwhoseauthscommittousingit.(SomeotherFreeSoftwareFoundationsoftwareiscoveredbytheGNULesserGeneralPublicLicenseinstead.)Youcanapplyitt
4、oyourprogramstoo.Whenwespeakoffreesoftwarewearereferringtofreedomnotprice.OurGeneralPublicLicensesaredesignedtomakesurethatyouhavethefreedomtodistributecopiesoffreesoftware(gefthisserviceifyouwish)thatyoureceivesourcecod
5、ecangetitifyouwantitthatyoucanchangethesoftwareusepiecesofitinnewfreeprogramsthatyouknowyoucandothesethings.Toprotectyourrightsweneedtomakerestrictionsthatfbidanyonetodenyyoutheserightstoaskyoutosurrendertherights.Theser
6、estrictionstranslatetocertainresponsibilitiesfyouifyoudistributecopiesofthesoftwareifyoumodifyit.Fexampleifyoudistributecopiesofsuchaprogramwhethergratisfafeeyoumustgivetherecipientsalltherightsthatyouhave.Youmustmakesur
7、ethattheytooreceivecangetthesourcecode.youmustshowthemthesetermssotheyknowtheirrights.Weprotectyourrightswithtwosteps:(1)copyrightthesoftware(2)offeryouthislicensewhichgivesyoulegalpermissiontocopydistributemodifythesoft
8、ware.Alsofeachauthsprotectionourswewanttomakecertainthateveryoneunderststhatthereisnowarrantyfthisfreesoftware.Ifthesoftwareismodifiedbysomeoneelsepassedonwewantitsrecipientstoknowthatwhattheyhaveisnottheiginalsothatanyp
9、roblemsintroducedbyotherswillnotreflectontheiginalauthsreputations.Finallyanyfreeprogramisthreatenedconstantlybysoftwarepatents.Wewishtoavoidthedangerthatredistributsofafreeprogramwillindividuallyobtainpatentlicensesinef
10、fectmakingtheprogramproprietary.Topreventthiswehavemadeitclearthatanypatentmustbelicensedfeveryonesfreeusenotlicensedatall.Theprecisetermsconditionsfcopyingdistributionmodificationfollow.GNUGENERALPUBLICLICENSETERMSCONDI
11、TIONSFCOPYINGDISTRIBUTIONMODIFICATIONontheProgramthedistributionofthewholemustbeonthetermsofthisLicensewhosepermissionsfotherlicenseesextendtotheentirewholethustoeacheverypartregardlessofwhowroteit.Thusitisnottheintentof
12、thissectiontoclaimrightscontestyourrightstowkwrittenentirelybyyourathertheintentistoexercisetherighttocontrolthedistributionofderivativecollectivewksbasedontheProgram.InadditionmereaggregationofanotherwknotbasedontheProg
13、ramwiththeProgram(withawkbasedontheProgram)onavolumeofastagedistributionmediumdoesnotbringtheotherwkunderthescopeofthisLicense.3.YoumaycopydistributetheProgram(awkbasedonitunderSection2)inobjectcodeexecutablefmunderthete
14、rmsofSections12aboveprovidedthatyoualsodooneofthefollowing:a)AccompanyitwiththecompletecrespondingmachinereadablesourcecodewhichmustbedistributedunderthetermsofSections12aboveonamediumcustomarilyusedfsoftwareinterchangeb
15、)AccompanyitwithawrittenoffervalidfatleastthreeyearstogiveanythirdpartyfagenomethanyourcostofphysicallyperfmingsourcedistributionacompletemachinereadablecopyofthecrespondingsourcecodetobedistributedunderthetermsofSection
16、s12aboveonamediumcustomarilyusedfsoftwareinterchangec)Accompanyitwiththeinfmationyoureceivedastotheoffertodistributecrespondingsourcecode.(Thisalternativeisallowedonlyfnoncommercialdistributiononlyifyoureceivedtheprogram
17、inobjectcodeexecutablefmwithsuchanofferinaccdwithSubsectionbabove.)Thesourcecodefawkmeansthepreferredfmofthewkfmakingmodificationstoit.Fanexecutablewkcompletesourcecodemeansallthesourcecodefallmodulesitcontainsplusanyass
18、ociatedinterfacedefinitionfilesplusthesusedtocontrolcompilationinstallationoftheexecutable.Howeverasaspecialexceptionthesourcecodedistributedneednotincludeanythingthatisnmallydistributed(ineithersourcebinaryfm)withthemaj
19、components(compilerkernelsoon)oftheoperatingsystemonwhichtheexecutablerunsunlessthatcomponentitselfaccompaniestheexecutable.Ifdistributionofexecutableobjectcodeismadebyofferingaccesstocopyfromadesignatedplacethenoffering
20、equivalentaccesstocopythesourcecodefromthesameplacecountsasdistributionofthesourcecodeeventhoughthirdpartiesarenotcompelledtocopythesourcealongwiththeobjectcode.4.YoumaynotcopymodifysublicensedistributetheProgramexceptas
21、expresslyprovidedunderthisLicense.AnyattemptotherwisetocopymodifysublicensedistributetheProgramisvoidwillautomaticallyterminateyourrightsunderthisLicense.HoweverpartieswhohavereceivedcopiesrightsfromyouunderthisLicensewi
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