Master's Thesis from the year 2011 in the subject Law - European and International Law, Intellectual Properties, grade: 1,3, Leiden University (Europaisches Rechtsinstitut), language: English, abstract: This thesis looks at the EU ne bis in idem principle. In particular it examines if this principle that no one shall be held liable twice for the same act, contains an enforcement requirement. Because the ne bis in idem principle is codified in different sources of EU law which all have slightly different wordings, a (national) judge may be confronted with the difficult question as to what...