This Article introduces our Special Issue by posing a central question: What is the added value of the increasing prominence of the concept of the “essence” of fundamental rights in EU law? It will address this larger question in four steps: First, by examining the function of the concept in EU law and the methods for its derivation; second, by summarizing how its application diverges across EU—and international—law; third, by outlining some enduring difficulties with the essence concept; and finally, by reflecting on its future role in EU law, including its impact on other sites of legal authority—such as domestic fundamental rights, the political institutions of the EU, and international human rights law. As the other articles of this issue demonstrate, while there is not yet a coherent approach to deriving and understanding the essence of rights across the fundamental rights the EU must protects, the essence concept plays an increasingly significant role in demarcating the boundaries between the EU’s legal and political orders and between overlapping sites of legal authority. Recent developments—such as the rule of law “crises”—are likely to further amplify the importance of “essence” to EU law practice and scholarship.

The concept of the essence of a fundamental right—set out in Article 52(1) of the Charter of Fundamental Rights of the European Union (the “Charter”)—operates as a constant reminder that our core values as Europeans are absolute. In other words, they are not up for balancing. As the seminal judgment of the Court of Justice of the European Union (the “CJEU”) in Schrems shows, where a measure imposes a limitation on the exercise of a fundamental right that is so intense and so comprehensive that it calls into question that right as such, that measure is incompatible with the Charter, as it deprives the right at issue of its essence. This is so without the need for a balancing exercise of competing interests, because a measure that compromises the very essence of a fundamental right is automatically disproportionate. Therefore, the present contribution supports the contention that in order for the concept of essence to function in a constitutionally meaningful way, both EU and national courts should apply the “respect-for-the-essence test” before undertaking a proportionality assessment.

Article 52(1) of the EU Charter of Fundamental Rights lays down respect for the essence of right as one of the requirements that limitations on rights must respect. This provision is not innovative, as it formalizes into EU law the distinction between “core” and “periphery” of rights present in many national constitutions and in the ECJ and ECtHR case law. Nonetheless, the express reference to essence has given unprecedented resonance to that concept. Essence as the “limit of limits” has a Janus-like character. On the one hand, it pronounces that every fundamental right bears a minimum content which is ringfenced from interference by public and private actors. On the other hand, it stresses the malleability of rights and their social function. The core/periphery dichotomy reflects a balancing act moored in European legal tradition whose symbolism outperforms its utility as a judicial tool. This Article examines the essence clause of the Charter in light of the ECJ case law and the constitutional traditions of the Member States and assesses its role in the framework of fundamental rights protection in EU law. The Article first attempts a classification of rights limitations clauses in national constitutions, following which it discusses the interpretation of essence by the Spanish and the Italian Constitutional Courts. The Article then engages with a theoretical discussion of the concept of essence and examines the case law of the ECJ. Lastly, it looks at the limitations of the concept as a rights protection instrument in EU law.

The principle of equal treatment is essential to the process of European integration. It is one of the main principles – if not the main principle – driving this process forward. Equal treatment between States and the prohibition to discriminate on grounds of nationality are indeed cornerstones of the European project. Furthermore, the principle of equal treatment is a fundamental right according to which comparable situations must not be treated differently, and that different situations must not be treated in the same way unless such treatment is objectively justified. This fundamental right has also been given more specific expression in a set of Treaty provisions and Directives prohibiting discrimination on grounds of sex, racial or ethnic origin, religion or belief, disability, age, or sexual orientation. Precisely because the principle of equal treatment performs several important functions in the EU legal order, it is shaped by several sets of actors: constituent powers, legislature and judiciary. The article first maps out the various functions that the principle of equal treatment fulfills in EU law, placing emphasis on the complexity of the relevant constitutional framework. This sets the floor for a critical discussion on how different institutional visions of the principle may compete, and a reflection of the role of the concept of ‘essence’ to articulate these competing visions.

Smoking kills. It is also very costly, which is why many governments try to change the habits of their citizens, including by changing the packaging of the products they buy. Of course, tobacco firms are pushing against such laws. They see their rights, in particular, rights to intellectual property, violated. They argue that such legislative changes take away the essence of their hard-earned IP rights and should not be permissible. They point out that the CJEU is allegedly redefining the “essence” of fundamental rights and its function in the system of limitations and developing a set of core inviolable rights.

How justified are these arguments? The absolute theory of essence says that the essence of rights cannot be interfered with or taken away, including by the legislator. The relative theory of essence, on the other hand, claims that interference with essence is just a more serious interference which is still subject to the typical proportionality analysis. Therefore, the adoption of either of these two theories has profound consequences. What might constitute the essence of intellectual property rights? When are legislators touching upon it? Is the CJEU really advancing a notion of essence that can prevent legislative changes, or at least make them very difficult? The answer to all these questions depends on our understanding of what constitutes the “essence” of intellectual property rights, and what consequences this notion has under Article 17(2) of the EU Charter of Fundamental Rights.

In the constitutional shaping of the concept of essence of fundamental rights, the case law of the Court of Justice of the EU (“CJEU” or “the Court”) in the field of privacy and data protection plays a crucial role. The Court’s interpretation of this notion had a considerable impact not only jon perception of the essence in other fields of law, but also on the constitutional doctrine more generally. This Article focuses on specificities of the notion of essence of fundamental rights to privacy and the protection of personal data from Articles 7 and 8 of the Charter of Fundamental Rights of the EU. After a general analysis, situating this notion into the framework of multi-level protection of fundamental rights in Europe, the Article addresses further interpretative challenges relating to the essence in the Court’s case law. At the core of the analysis are the Schrems and Digital Rights Ireland cases, where the CJEU developed, for the first time, the modalities of the breach of essence of fundamental rights to privacy and data protection and laid down constitutional foundations for interpretation of this notion. Further jurisprudence, including the Tele2 Sverige and Opinion 1/15 cases, is analyzed as an example of fine-tuning of the CJEU’s approach towards the normative understanding of this concept. Against this backdrop, the Article elaborates on the importance of insights in the fields of privacy and data protection for the general constitutional understanding of the concept of essence and proposes a generalized method for determination of infringement of essence in fundamental rights jurisprudence.

This contribution examines the developing contours of the essence of the fundamental right to an effective remedy and to a fair trial in the light of salient case-law of the Court of Justice of the European Union. It is divided into three main parts. The first part provides an overview of the meaning of the essence of fundamental rights in EU law and the scope of the inquiry in relation to Article 47 of the Charter of the Fundamental Rights of the European Union (“the Charter”). The second part evaluates the essence of the fundamental right to an effective remedy and to a fair trial in connection with justified limitations that may be placed on its exercise as provided for in Article 52(1) of the Charter within the framework of the EU system of fundamental rights protection, which in turn implicates the relationship with the Court’s case-law on national procedural autonomy, equivalence, and effectiveness. The third part delves into the essence of the fundamental right to an effective remedy and to a fair trial within the framework of the EU system of judicial protection, as illustrated by the Court’s case-law in several areas, including standing for individuals in direct actions before the EU courts, judicial independence, and restrictive measures in the Common Foreign and Security Policy. Through this analysis, the author argues that, while much awaits further refinement, certain recent developments in the Court’s case–law indicate that the essence of the fundamental right to an effective remedy and to a fair trial can play a meaningful role in the EU system of fundamental rights protection and the EU system of judicial protection more broadly, and thus the best may be yet to come as that case-law progresses in the future.

The concept of the “essence”—as well as the related concepts of “substance” or “core”—of fundamental rights is absent from the text of the European Convention on Human Rights (ECHR), but regularly appears in the case law of the European Court of Human Rights (ECtHR) since the Belgian Linguistic case of 1968. Yet, fifty years after its explicit emergence in the Convention’s legal order, it must be observed that a clear understanding of this concept and of its practical utility is still lacking. Indeed, the idea of the essence of fundamental rights has never been clearly defined in its case law, which remains essentially pragmatic and unprincipled in this field. This Article will therefore attempt to remedy this shortcoming by sketching out the different functions assigned to the concepts of the essence, substance, and core of rights in the ECtHR’s case law. It is postulated that the concepts of the essence, substance, and core of fundamental rights are invoked for three different types of purposes. First, the concepts of the essence, substance, and core are—apparently at least—used by the ECtHR to fix the “limit on the limits,” for example, the inalienable part of fundamental rights safeguarded from any possible restriction. Second, this concept has been a vehicle for expanding the Convention’s sphere of protection for the purposes of guaranteeing its effectiveness. Third, the concepts of the essence, substance, and core of fundamental rights also constitute a “reviewing tool” used by the Court to determine the intensity of the States’ obligations on the basis of a prioritization among a series of values at stake. Although these three different functions can be identified on paper, the practical usefulness, workability, and desirability of the concepts of the essence, substance, and core will be questioned.

While the “essence” of EU fundamental rights has received much attention following the CJEU’s Schrems decision, the concept of “essence” remains much less examined in international human rights law. Nonetheless, a concept of “essence” for human rights can also be found in international law. This Article discusses different aspects of the “essence” concept in international human rights law, namely non-derogability, non-restrictability, and minimum core, in three steps. First, the Article looks at civil political rights and socioeconomic rights separately and identifies two different approaches to the concept of essence for each of the two categories: While for civil and political rights the concept of essence is mainly linked to the notions of non-derogability and non-restrictability, for socioeconomic rights, the concept refers mainly to the states’ obligation to guarantee an essential level of protection independent of their resource limitations. Second, the Article continues by reading the two approaches together and identifies certain elements of an overarching “essence” concept. Finally, the Article discusses the relationship between the CJEU’s “essence” jurisprudence and the related concepts in international law and concludes with two theses: First, international law deserves more attention when reflecting on the EU’s concept of essence. It equally employs concepts of “essence” and also informs the development and interpretation of EU law. Second, when engaging with the question of whether the EU law should draw lessons from its international counterpart on the notion of “essence,” one must contemplate drawbacks for EU law that the concept has presented for international law.