As a result from constitutional transformations, those who registered began to prosecute their work in private character. Therefore, many of them are trying to show technological progress and separate with the State; not only to computerize all the information, but as well as make it available online. The main subject of this thesis is the use of private information in a public space such as the Internet. The absence of a specific legislation in our country that control this use caused the author using the legal compare to point out some similarities and differences about the rules and institutions that provide security for the personal information. This includes the European Community from civil law and countries that are ruled in common law, such as the United States from Brazilians´ institutes. Other than that, the focus is interdisciplinary because it includes Constitution Law, Civil Law and Internet Law. Resulting from the research about the conflict between private and public information, we attempted to find a solution for this problem. One of the main ideas was the creation of a filter that was capable to separate the personal information from the rest, which would keep the users safe without ceasing the right of knowledge.