Which is the National Office in charge of Intellectual Property Rights in Brazil?

Depending on the IPR concerned the competent authority may vary:

The office in charge of Patents, Utility Models, Trademarks, Designs, Software, Semiconductors Layout and Appellations of Origin is the Instituto Nacional da Propriedade Industrial (INPI).

With regards Copyright the competent office is the Fundaçao Biblioteca Nacional (FBN), except in the case of software.

Finally, the competent authority for Plant Varieties is the Instituto Nacional de Semillas (SNPC)