14 States vis-à-vis all human beings under their jurisdictions. With the evolution of the International Law of Human Rights, it is Public International Law itself which is justified and legitimised, in affirming juridical principles, concepts and categories proper to the present domain of protection, based on premises fundamentally distinct from those which have guided the application of its postulates at the level of purely inter-State relations 60. 45. One is not, therefore, here proposing that the development of the International Law of Human Rights be brought about to the detriment of the law of treaties: my understanding, entirely distinct, is in the sense that the norms of the law of treaties (such as those set forth in the two above-mentioned Vienna Conventions, anyway of a residual character) can greatly enrich with the impact of the International Law of Human Rights, and develop their aptitude to regulate adequately the legal relations at inter-State as well as intra-State levels, under the respective treaties of protection. In sustaining the development of a system of objective determination - which seems to us wholly necessary - of the compatibility or otherwise of reservations with the object and purpose of human rights treaties in particular, in which the organs of international protection created by such treaties would exert an important role, we do not see in that any threat to the "unity" of the law of treaties. 46. Quite on the contrary, there could hardly be something more fragmenting and underdeveloped than the present system of reservations of the two Vienna Conventions, for which reason it would be entirely illusory to assume that, to continue applying it as until now, one would thereby be fostering the "unity" of the law of treaties. The true unity of the law of treaties, in the framework of Public International Law, would be better served by the search for improvement in this area, overcoming the ambiguities, uncertainties and lacunae of the present system of reservations, through the development of a system of objective determination (supra), in conformity with the special nature of human rights treaties and the objective character of the conventional obligations of protection. The unity of Public International Law itself is measured rather by its aptitude to regulate legal relations in distinct contexts with equal adequacy and effectiveness. 3. Considerations on the Denunciation of Treaties. 47. The two Vienna Conventions on the Law of Treaties (1969 and 1986) determine that a treaty which contains no provision on denunciation is not subject to denunciation, unless it can be established that the parties intended to admit the possibility of denunciation of that this latter "may be implied by the nature of the treaty" (Article 56(1)). The two Vienna Conventions thus open the way to the taking into account of the nature or specificity of certain treaties. As already seen, the special nature of treaties of a humanitarian character (such as human rights treaties) has indeed been taken into account, and has been widely acknowledged. Accordingly, certain limits have been established with regard to the denunciation of such treaties. 48. In fact, basic considerations of humanity have permeated also the clauses of denunciation of certain treaties. This is aptly illustrated, e.g., by the provisions on denunciation of the four Geneva Conventions on International Humanitarian Law of 1949. According to those provisions (common Article 63/62/142/158), the denunciation, which will take effect one year after its notification, shall not, however, while the denouncing power is engaged in a conflict, take any effect "until peace has been concluded", and until the "operations connected with the release and repatriation of the persons protected" by the Geneva Conventions "have been terminated". In this way, the obligations of the Parties as to the safeguard of the persons protected under 60 . A.A. Cançado Trindade, "The International Law of Human Rights at the Dawn of the XXIst Century", op. cit. supra n. (53), pp. 145-221.