"Melchor Pérez de Soto between Legality and Censorship" is a thorough investigation that examines the dissemination of ideas and their interpretation in the society of New Spain in the 17th century. The focus is on Melchor Pérez de Soto, a prominent teacher at the Cathedral of Mexico City, who was arrested by the Inquisition in 1655 for practicing Jewish astrology and possessing forbidden books. The research relies on a detailed analysis of primary sources, including the inventory of his books and the documents from the Inquisition process. The work highlights the interest in prohibited writings and their influence on the social dynamics that led to an increased spread of ideas and a break with the norms of the ruling class. This study provides valuable insights into the interactions between knowledge, power, and censorship in a historical period marked by profound social and cultural changes.