The recent surge of multijurisdictional IP disputes and increase in non-binding soft laws have made scholars cast doubt on the sustainability of public international law and the validity of the current IP legal system. Private lawyers may now think that they do not have to pay keen attention to public international law any longer when providing legal advice to their clients, particularly MNCs. This study makes a concise description of today’s legal environment in the field of IP, focusing on the emerging legal norms of transnational law, particularly in the context of its interplay with public international law. With respect to this, the ongoing and even heightened roles of public international law will be discussed. Finally, a typology is suggested using exponents to express intensity of State sovereignty to facilitate understanding on the relationship between public international law and other categories of law.

I. Introduction
 II. Challenges of Globalization forPublic International Law
  A. Evolution of Transnational Law
  B. Multijurisdictional IP Disputes
  C. Exhaustion of States’ Rule-making Authority?
 III. New Roles of Public International Lawin the Field of IP
  A. The Public-Private Dichotomy of Law
  B. Sovereignty Focused Hierarchy of Law
  C. Emerging Roles of Public International Law
 IV. Conclusion: Growing Importance ofPublic International Law

• Sung Pil Park(Head Professor at the Intellectual Property Program of the Korea Advanced Institute of Science and Technology(KAIST).)