The Brazilian Supreme Court ruled in ADI No. 4815 that the publication of biographies could occur independently of the authorization of the persons portrayed, on the grounds that the right to freedom of expression would have a preferential position vis-à-vis the existential rights at risk, such as honor, image and privacy. Even though the Supreme Federal Court recognized the existence and importance of such rights, it could only be claimed, via civil liability, after the publication of the biography. However, as will be shown, the general clause of protection of the human person, which encompasses the existential rights mentioned, and is extracted from the principle of the human dignity, cannot be in an inferior position when comparing to the right to freedom of speech, especially because the principle was regarded by the 1988 constituent as one of the foundations of the Republic. In this way, existential rights must be observed in compatibility with the relevance that the principle of the human dignity occupies in the Constitution of the Republic. Consequently, to the biography subject must be given the possibility and opportunity to preserve his existential subjective rights, especially related to the publishing of intimate information that, if revealed, will cause embarrassment and eventual discrimination. Thus, the right to privacy as informative self-determination allows the biography subject to have control over the information that is being collected and will be made available to readers and this control will only be possible if the biography subject is communicated before the publication of the story of his life. Thus, he can access the Judiciary and prevent a threat of injury from becoming an effective injury to his dignity.