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1、GNUGENERALPUBLICLICENSEVersion2June1991Copyright(C)19891991FreeSoftwareFoundationInc.59TemplePlaceSuite330BostonMA021111307USAEveryoneispermittedtocopydistributeverbatimcopiesofthislicensedocumentbutchangingitisnotallowe
2、d.PreambleThelicensesfmostsoftwarearedesignedtotakeawayyourfreedomtosharechangeit.BycontrasttheGNUGeneralPublicLicenseisintendedtoguaranteeyourfreedomtosharechangefreesoftwaretomakesurethesoftwareisfreefallitsusers.ThisG
3、eneralPublicLicenseappliestomostoftheFreeSoftwareFoundationssoftwaretoanyotherprogramwhoseauthscommittousingit.(SomeotherFreeSoftwareFoundationsoftwareiscoveredbytheGNULibraryGeneralPublicLicenseinstead.)Youcanapplyittoy
4、ourprogramstoo.Whenwespeakoffreesoftwarewearereferringtofreedomnotprice.OurGeneralPublicLicensesaredesignedtomakesurethatyouhavethefreedomtodistributecopiesoffreesoftware(gefthisserviceifyouwish)thatyoureceivesourcecodec
5、angetitifyouwantitthatyoucanchangethesoftwareusepiecesofitinnewfreeprogramsthatyouknowyoucandothesethings.Toprotectyourrightsweneedtomakerestrictionsthatfbidanyonetodenyyoutheserightstoaskyoutosurrendertherights.Theseres
6、trictionstranslatetocertainresponsibilitiesfyouifyoudistributecopiesofthesoftwareifyoumodifyit.Fexampleifyoudistributecopiesofsuchaprogramwhethergratisfafeeyoumustgivetherecipientsalltherightsthatyouhave.Youmustmakesuret
7、hattheytooreceivecangetthesourcecode.youmustshowthemthesetermssotheyknowtheirrights.Weprotectyourrightswithtwosteps:(1)copyrightthesoftware(2)offeryouthislicensewhichgivesyoulegalpermissiontocopydistributemodifythesoftwa
8、re.Alsofeachauthsprotectionourswewanttomakecertainthateveryoneunderststhatthereisnowarrantyfthisfreesoftware.Ifthesoftwareismodifiedbysomeoneelsepassedonwewantitsrecipientstoknowthatwhattheyhaveisnottheiginalsothatanypro
9、blemsintroducedbyotherswillnotreflectontheiginalauthsreputations.Finallyanyfreeprogramisthreatenedconstantlybysoftwarepatents.Wewishtoavoidthedangerthatredistributsofafreeprogramwillindividuallyobtainpatentlicensesineffe
10、ctmakingtheprogramproprietary.Topreventthiswehavemadeitclearthatanypatentmustbelicensedfeveryonesfreeusenotlicensedatall.Theprecisetermsconditionsfcopyingdistributionmodificationfollow.Theserequirementsapplytothemodified
11、wkasawhole.IfidentifiablesectionsofthatwkarenotderivedfromtheProgramcanbereasonablyconsideredindependentseparatewksinthemselvesthenthisLicenseitstermsdonotapplytothosesectionswhenyoudistributethemasseparatewks.Butwhenyou
12、distributethesamesectionsaspartofawholewhichisawkbasedontheProgramthedistributionofthewholemustbeonthetermsofthisLicensewhosepermissionsfotherlicenseesextendtotheentirewholethustoeacheverypartregardlessofwhowroteit.Thusi
13、tisnottheintentofthissectiontoclaimrightscontestyourrightstowkwrittenentirelybyyourathertheintentistoexercisetherighttocontrolthedistributionofderivativecollectivewksbasedontheProgram.Inadditionmereaggregationofanotherwk
14、notbasedontheProgramwiththeProgram(withawkbasedontheProgram)onavolumeofastagedistributionmediumdoesnotbringtheotherwkunderthescopeofthisLicense.3.YoumaycopydistributetheProgram(awkbasedonitunderSection2)inobjectcodeexecu
15、tablefmunderthetermsofSections12aboveprovidedthatyoualsodooneofthefollowing:a)AccompanyitwiththecompletecrespondingmachinereadablesourcecodewhichmustbedistributedunderthetermsofSections12aboveonamediumcustomarilyusedfsof
16、twareinterchangeb)Accompanyitwithawrittenoffervalidfatleastthreeyearstogiveanythirdpartyfagenomethanyourcostofphysicallyperfmingsourcedistributionacompletemachinereadablecopyofthecrespondingsourcecodetobedistributedunder
17、thetermsofSections12aboveonamediumcustomarilyusedfsoftwareinterchangec)Accompanyitwiththeinfmationyoureceivedastotheoffertodistributecrespondingsourcecode.(Thisalternativeisallowedonlyfnoncommercialdistributiononlyifyour
18、eceivedtheprograminobjectcodeexecutablefmwithsuchanofferinaccdwithSubsectionbabove.)Thesourcecodefawkmeansthepreferredfmofthewkfmakingmodificationstoit.Fanexecutablewkcompletesourcecodemeansallthesourcecodefallmodulesitc
19、ontainsplusanyassociatedinterfacedefinitionfilesplusthesusedtocontrolcompilationinstallationoftheexecutable.Howeverasaspecialexceptionthesourcecodedistributedneednotincludeanythingthatisnmallydistributed(ineithersourcebi
20、naryfm)withthemajcomponents(compilerkernelsoon)oftheoperatingsystemonwhichtheexecutablerunsunlessthatcomponentitselfaccompaniestheexecutable.Ifdistributionofexecutableobjectcodeismadebyofferingaccesstocopyfromadesignated
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