This new work presents the Principles, alongside article-by-article commentary and notes, which analyse thoroughly the context of the rule within the Principles, as well as within the existing legal solutions at the national, European and international level. It also explores the policy considerations underlying the rule, enabling a better understanding of why the Principles adopt the solutions laid out in the rules. Useful references are provided to the relevant legal provisions and cases dealing with the respective issues of intellectual property and private international law.