Casado Filho, Petrúcio Lopes. “Copyright Law Vs. Copyleft: Controversies Between Textbook Copyright and Private Photocopying”. Revista de Propriedade Intelectual, Direito Contemporâneo e Constituição 2, no. 1 (February 1, 2013): 1–97. Accessed October 9, 2026. https://pidcc.com.br/pidcc/article/view/9.