The chapter “Legal Compliance” presents the historical evolution and current framework of international and national maritime regulations governing offshore oil production. It begins with the origins of maritime classification, tracing back to Edward Lloyd’s Coffee House in 17th-century London, which led to the creation of the Lloyd’s Register—the world’s first ship classification society. The text then outlines the establishment of Bureau Veritas and the global movement toward standardized safety practices following the Titanic disaster, culminating in the International Convention for the Safety of Life at Sea (SOLAS) in 1914 and the later creation of the International Maritime Organization (IMO) in 1948. The chapter explains the purpose and structure of key international conventions—SOLAS, MARPOL, ISM Code, and the MODU Code—highlighting their essential roles in ensuring vessel safety, environmental protection, and operational management in the maritime industry. It also details Brazil’s adherence to these conventions through national legislation, notably LESTA (Law No. 9,537/1997) and the NORMAM regulations issued by the Directorate of Ports and Coasts (DPC) of the Brazilian Navy, which govern offshore operations and maritime safety in national waters. The chapter concludes by describing the Master Table of an Offshore Installation, which defines crew roles and minimum staffing requirements—including the Offshore Installation Manager (OIM) and other key positions—emphasizing that compliance with both international and national regulations is fundamental to the safety, environmental responsibility, and operational integrity of offshore oil production facilities.