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DOI: 10.1590/2179-8966/2020/44121. Resumo A pesquisa versa sobre o direito fundamental a liberdade de expressao, busca delimitar sua extensao e aplicacao na jurisprudencia norte-americana e brasileira. Apresenta as principais teorias desenvolvidas pelos juristas norte-americanos, assim como as criticas e desafios que estas enfrentam. A partir dessa revisao bibliografica aponta os argumentos que fundamentam o direito, assim como as hipoteses que o desafiam, caso do discurso de odio, pornografia, fake news , a regulacao da midia em periodos eleitorais e da obrigatoriedade da exibicao de alguns conteudos. Alem de uma abordagem dogmatica, e realizada tambem uma analitica, com o estudo de alguns casos das principais cortes dos Estados Unidos e do Brasil, ao final de que, desenvolvido um estudo comparativo entre as decisoes dos dois paises. A conclusao obtida e a de que a protecao concedida pelo Estado brasileiro a liberdade de expressao nao e pautada em criterios decisivos claros, estando, portanto, sujeita a um elevado grau de imprecisao e inseguranca. Palavras chave: Liberdade de expressao; Direitos fundamentais; Direito comparado. Abstract In this paper, we investigate the fundamental right to free speech, its extension and applicability in the American and Brazilian jurisprudence. To do so, we present a literature review of the main theories developed by American jurists, as well as the critics and challenges that they face. Through these elements, we discuss a set of arguments that support the right to free speech and some opposite hypothesis that challenge its content, such as hate speech, pornography, fake news, regulation of media during election season and the obligation to exhibit some sensible contents. Following this dogmatic approach, we provide an analysis of some cases of the main courts of the United States and Brazil, developing a comparative study between the decisions taken in these countries. Further, we conclude that the protection granted by the Brazilian state to freedom of expression is not based on clear decisive criteria, and is therefore subjected to a high degree of inaccuracy and insecurity. Keywords: Free speech; Fundamental rights; Comparative Law.

Liberdade de Expressão: Teorias, Fundamentos e Análise de Casos