Concept of Copyleft: Free Software, Creative Commons and Open Source . Journal of Intellectual Property Rights (JIPR), [S. l.], v. 30, n. 3, p. 269–273, 2025. DOI: 10.56042/jipr.v30i3.6225. Disponível em: https://or.niscpr.res.in/index.php/JIPR/article/view/6225. Acesso em: 14 may. 2026.