This document discusses the key legal issues companies face when doing international business. It explains that there is no single international commercial law, and companies must comply with the laws of each country they operate in. The major legal systems are outlined as common law, civil/code law, Islamic law, and Marxist-socialist law. Key differences between these systems are explained. The document also discusses international legal disputes, marketing laws in different countries, intellectual property rights, environmental regulations, antitrust laws, and unresolved cyberlaw issues.