International obligations may rest on all sorts of persons: states, organizations, corporations, human beings; in short, all entities capable of being influenced by the contents of the obligation. It may be said that an international obligation so incumbent upon a person makes him an international person, which does not exclude him at the same time from remaining or becoming a person under some national or other system of law. The content of an obligation aims at directing the future conduct of the obligee. It must, however, be noticed that some kinds of obligation are not incumbent on persons as such, but on a society as a whole, in its constitutional function of making the legal system work, such as rules on decision-making or of conflict resolution, or the rules on securing compliance with obligations and pacta sunt servanda. They are to be applied above all by authorities (organs). They are, as it were, the rules of the game.