Is it possible to say that there is a full self-management of one s own data on the internet? This question, which guides this present dissertation, guides the purpose of this study, which aims to verify whether, in practical terms, data subjects have effective control over the use of their personal information in cyberspace. Under the analysis of different arrangements between online relations and their respective means of interference made available to the data subject, an attempt is made to outline parameters consistent with self-government over data, considering the assumptions of the right to informational self-determination, basic to the personal data protection system. In order to identify these factual circumstances, the research focuses on the contextualization of consent, as a possible legal hypothesis capable of authorizing data processing. It is believed that a greater understanding of the proper forms of informational control exercised by data subjects will be crucial to the construction of a more complete and reliable processing relations on the internet.