Article 80 Nothing in the present Convention shall be interpreted as impairing the provisions of the Charter of the United Nations and of the constitutions of the specialized agencies which define the respective responsibilities of the various organs of the United Nations and of the specialized agencies in regard to the matters dealt with in the present Convention. Article 81 1. Nothing in the present Convention shall affect more favourable rights or freedoms granted to migrant workers and members of their families by virtue of: (a) The law or practice of a State Party; or (b) Any bilateral or multilateral treaty in force for the State Party concerned. 2. Nothing in the present Convention may be interpreted as implying for any State, group or person any right to engage in any activity or perform any act that would impair any of the rights and freedoms as set forth in the present Convention. Article 82 The rights of migrant workers and members of their families provided for in the present Convention may not be renounced. It shall not be permissible to exert any form of pressure upon migrant workers and members of their families with a view to their relinquishing or foregoing any of the said rights. It shall not be possible to derogate by contract from rights recognized in the present Convention. States Parties shall take appropriate measures to ensure that these principles are respected. Article 83 Each State Party to the present Convention undertakes: (a) To ensure that any person whose rights or freedoms as herein recognized are violated shall have an effective remedy, notwithstanding that the violation has been committed by persons acting in an official capacity; (b) To ensure that any persons seeking such a remedy shall have his or her claim reviewed and decided by competent judicial, administrative or legislative authorities, or by any other competent authority provided for by the legal system of the State, and to develop the possibilities of judicial remedy; (c) To ensure that the competent authorities shall enforce such remedies when granted. Article 84 PART IX: Each State Party undertakes to adopt the legislative and other measures that are necessary to implement the provisions of the present Convention. Final provisions Article 85 The Secretary-General of the United Nations is designated as the depositary of the present Convention. Article 86 1. The present Convention shall be open for signature by all States. It is subject to ratification. 2. The present Convention shall be open to accession by any State. 3. Instruments of ratification or accession shall be deposited with the Secretary-General of the United Nations. Article 87 1. The present Convention shall enter into force on the first day of the month following a period of three months after the date of the deposit of the twentieth instrument of ratification or accession. 2. For each State ratifying or acceding to the present Convention after its entry into force, 37