User's Manual

126
When we speak of free software, we are referring to freedom, not
price.OurGeneralPublicLicensesaredesignedtomakesurethat
youhavethefreedomtodistributecopiesoffreesoftware(and
charge for this service if you wish), that you receive source code or
can get it if you want it, that you can change the software or use
pieces of it in new free programs; and that you know you can do
these things.
Toprotectyourrights,weneedtomakerestrictionsthatforbid
anyone to deny you these rights or to ask you to surrender the
rights.Theserestrictionstranslatetocertainresponsibilitiesfor
youifyoudistributecopiesofthesoftware,orifyoumodifyit.
Forexample,ifyoudistributecopiesofsuchaprogram,whether
gratis or for a fee, you must give the recipients all the rights that
you have. You must make sure that they, too, receive or can get
the source code. And you must show them these terms so they
know their rights.
We protect your rights with two steps: (1) copyright the software,
and (2) oer you this license which gives you legal permission to
copy,distributeand/ormodifythesoftware.
Also,foreachauthor’sprotectionandours,wewanttomake
certain that everyone understands that there is no warranty for
thisfreesoftware.Ifthesoftwareismodiedbysomeoneelseand
passed on, we want its recipients to know that what they have is
nottheoriginal,sothatanyproblemsintroducedbyotherswill
notreectontheoriginalauthors’reputations.