Let us address the elephant in the room. You will find hundreds of links on Facebook groups, Scribd, and Academia.edu claiming to host the Isagani Cruz Public International Law PDF .

A central theme in Cruz’s introduction is the binding force of international law. He addresses the age-old question: Why do states obey international law? He discusses the "sanction" of international law—not a police force, but the reciprocal nature of state relations, the pressure of world opinion, and the potential for retaliation or sanctions by other states.

Cruz explores the foundational debate on whether international law is true law, given the absence of a centralized global legislature or enforcement agency. He emphasizes the binding nature of international obligations through:

You can find digital versions of notes and partial chapters through the following educational repositories: International Law - Centralbooks

Cruz begins by defining Public International Law as the body of rules and principles that govern the relations of states and other international persons. He distinguishes this from Private International Law (Conflict of Laws), noting that while the former regulates relations between states, the latter deals with relations between individuals under different municipal laws.