The basis for this work is questions from the Brazilian librarian community that were sent to the Brazilian Commission on Copyright and Open Access (CBDA) of the Brazilian Federation of Library Associations, Information Scientists and Institutions (FEBAB). We organized the questions and answers in the form of a Guide in order to make it easier to understand and absorb by the country's libraries and librarians. Legally, the starting points are, first and foremost, the recognition of the Right of Access to Information, Knowledge and Culture as a fundamental right, constitutionally and internationally anchored, with which copyright must necessarily be harmonized - an aspect on which copyright legislation, both ordinary and infra-constitutional, is unsatisfactory, outdated and incomplete. Also, the court decisions from the Brazilian Superior Court of Justice in the last decade, starting with the paradigmatic decision handed down in Special Appeal 964.404/11, consolidated in the Enunciation 115 of the III Commercial Law Conference of the Federal Justice Council.