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GNU - General Public License V.2
Version2,June1991
Copyright(C)1989,1991FreeSoftwareFoundation,Inc.,51FranklinStreet,
FifthFloor,Boston,MA02110‐1301USA.Everyoneispermittedtocopyand
distributeverbatimcopiesofthislicensedocument,butchangingitisnot
allowed.
Preamble
Thelicensesformostsoftwarearedesignedtotakeawayyourfreedomto
shareandchangeit.Bycontrast,theGNUGeneralPublicLicenseisintende
dto
guaranteeyourfreedomtoshareandchangefreesoftware‐‐tomakesurethe
softwareisfreeforallitsusers.ThisGeneralPublicLicenseappliestomostof
theFreeSoftwareFoundation'ssoftwareandtoanyotherprogramwhose
authorscommittousingit.(SomeotherFreeSoftwareFoundationsoftwareis
coveredbytheGN
ULesserGeneralPublicLicenseinstead.)Youcanapplyitto
yourprograms,too.
Whenwespeakoffreesoftware,wearereferringtofreedom,notprice.Our
GeneralPublicLicensesarede
signe
dtomakesurethatyouhavethefreedom
todistributecopiesoffreesoftware(andchargeforthisserviceifyouwish),
thatyoureceivesourcecodeorcangetitifyouwantit,thatyoucanchange
thesoftwareorusepiecesofitinnewfreeprograms;andthatyouknowyou
candothesethings.
Toprotectyourri
ghts,weneedtomakerestrictionsthatforbidanyonetodeny
youtheserightsortoaskyoutosurrendertherights.Theserestrictions
translatetocertainresponsibilitiesforyouifyoudistributecopiesofthe
software,orifyo
umodifyit.
Forexample,ifyoudistributecopiesofsuchaprogram,whethergratisorfora
fee,youmustgivetherecipientsalltherightsthatyouhave.Youmustmake
surethatthey,too,receiveorcangetthesourcecode.Andyoumustsh
ow
themth
esetermssotheyknowtheirrights.
Weprotectyourrightswithtwosteps:(1)copyrightthesoftware,and(2)offer
youthislicensewhichgivesyoulegalpermissiontocopy,distributeand/or
modifythesoftware.
Also,foreachauthor'sprotectionandours,wewanttomakecertainthat
everyoneunderstandsthatther
eisnowarrantyforthisfreesoftware.Ifthe
softwareismodifiedbysomeoneelseandpassedon,wewantitsrecipientsto
knowthatwhattheyhaveisnottheoriginal,sothatanyproblemsintroduced
byotherswillnotreflectontheoriginalauthors'reputations.