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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、TIONSFCOPYINGDISTRIBUTIONMODIFICATION0.ThisLicenseappliestoanyprogramotherwkwhichcontainsanoticeplacedbythecopyrightholdersayingitmaybedistributedInadditionmereaggregationofanotherwknotbasedontheProgramwiththeProgram(wit
12、hawkbasedontheProgram)onavolumeofastagedistributionmediumdoesnotbringtheotherwkunderthescopeofthisLicense.3.YoumaycopydistributetheProgram(awkbasedonitunderSection2)inobjectcodeexecutablefmunderthetermsofSections12abovep
13、rovidedthatyoualsodooneofthefollowing:a)AccompanyitwiththecompletecrespondingmachinereadablesourcecodewhichmustbedistributedunderthetermsofSections12aboveonamediumcustomarilyusedfsoftwareinterchangeb)Accompanyitwithawrit
14、tenoffervalidfatleastthreeyearstogiveanythirdpartyfagenomethanyourcostofphysicallyperfmingsourcedistributionacompletemachinereadablecopyofthecrespondingsourcecodetobedistributedunderthetermsofSections12aboveonamediumcust
15、omarilyusedfsoftwareinterchangec)Accompanyitwiththeinfmationyoureceivedastotheoffertodistributecrespondingsourcecode.(Thisalternativeisallowedonlyfnoncommercialdistributiononlyifyoureceivedtheprograminobjectcodeexecutabl
16、efmwithsuchanofferinaccdwithSubsectionbabove.)Thesourcecodefawkmeansthepreferredfmofthewkfmakingmodificationstoit.Fanexecutablewkcompletesourcecodemeansallthesourcecodefallmodulesitcontainsplusanyassociatedinterfacedefin
17、itionfilesplusthesusedtocontrolcompilationinstallationoftheexecutable.Howeverasaspecialexceptionthesourcecodedistributedneednotincludeanythingthatisnmallydistributed(ineithersourcebinaryfm)withthemajcomponents(compilerke
18、rnelsoon)oftheoperatingsystemonwhichtheexecutablerunsunlessthatcomponentitselfaccompaniestheexecutable.Ifdistributionofexecutableobjectcodeismadebyofferingaccesstocopyfromadesignatedplacethenofferingequivalentaccesstocop
19、ythesourcecodefromthesameplacecountsasdistributionofthesourcecodeeventhoughthirdpartiesarenotcompelledtocopythesourcealongwiththeobjectcode.4.YoumaynotcopymodifysublicensedistributetheProgramexceptasexpresslyprovidedunde
20、rthisLicense.AnyattemptotherwisetocopymodifysublicensedistributetheProgramisvoidwillautomaticallyterminateyourrightsunderthisLicense.HoweverpartieswhohavereceivedcopiesrightsfromyouunderthisLicensewillnothavetheirlicense
21、sterminatedsolongassuchpartiesremaininfullcompliance.5.YouarenotrequiredtoacceptthisLicensesinceyouhavenotsignedit.HowevernothingelsegrantsyoupermissiontomodifydistributetheProgramitsderivativewks.Theseactionsareprohibit
22、edbylawifyoudonotacceptthisLicense.TherefebymodifyingdistributingtheProgram(anywkbasedontheProgram)youindicateyouracceptanceofthisLicensetodosoallitstermsconditionsfcopyingdistributingmodifyingtheProgramwksbasedonit.6.Ea
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