This chapter lays out the relevant legal sources. First, this means a specification of the legislation and the courts, whose decisions are included in the analysis. In this process, the different legal levels of this book are accounted for, i.e. mainly the EU and the national levels, but also the international level. Hence, this chapter lays out the primary and secondary EU law followed by national trademark laws and a listing of the selected national courts. Finally, the international aspects of European trademark law are set out. The legal method of this book necessitates an account of not only the positive legal sources as they emerge in case law, but also sources relevant to interpreting European trademark law, such as preparatory works.