Stallman akapayona pfungwa yecopyleft, iyo inoshandisa nheyo dzemutemo wekopiraiti kuchengetedza kodzero yekushandisa, kugadzirisa, uye kugovera software yemahara, uye ndiye munyori mukuru wemarezinesi esoftware emahara ayo anotsanangura iwo mazwi, kunyanya GNU General Public License (GPL), iro rinonyanya kushandiswa rezinesi re software yemahara. Muna 1989, akabatana neLeague for Programming Freedom. Kubva pakati pemakore ekuma1990, Stallman akapedza yakawanda yenguva yake achitsigira software yemahara, pamwe nekurwisa software patent, manejimendi kodzero yedhijitari (yaakataura nezvayo sekutonga kwemiganhu yedhijitari, achidana izwi rakajairika), uye mamwe masisitimu epamutemo nehunyanzvi ayo aanoona sekutora rusununguko rwevashandisi. Izvi zvaisanganisira software, zvibvumirano zvekusazivisa, zvibvumirano zvekumisikidza, makiyi ekushandisa, makopi, dongles, mafaira ekushandisa, uye kodhi yemahara.
software rezinesi zvibvumirano, zvibvumirano zvekusazivisa, kiyi dzekumisikidza, dongles, kurambidzwa kwekopi, mafomati epamutemo, uye binary executables isina kodhi kodhi