30 166. The second obligation of the States Parties is to "ensure" the free and full exercise of the rights recognized by the Convention to every person subject to its jurisdiction. This obligation implies the duty of States Parties to organize the governmental apparatus and, in general, all the structures through which public power is exercised, so that they are capable of juridically ensuring the free and full enjoyment of human rights. As a consequence of this obligation, the States must prevent, investigate and punish any violation of the rights recognized by the Convention and, moreover, if possible attempt to restore the right violated and provide compensation as warranted for damages resulting from the violation. 167. The obligation to ensure the free and full exercise of human rights is not fulfilled by the existence of a legal system designed to make it possible to comply with this obligation --it also requires the government to conduct itself so as to effectively ensure the free and full exercise of human rights. 168. The obligation of the States is, thus, much more direct than that contained in Article 2, which reads: Article 2. Domestic Legal Effects Where the exercise of any of the rights or freedoms referred to in Article 1 is not already ensured by legislative or other provisions, the States Parties undertake to adopt, in accordance with their constitutional processes and the provisions of this Convention, such legislative or other measures as may be necessary to give effect to those rights or freedoms. 169. According to Article 1 (1), any exercise of public power that violates the rights recognized by the Convention is illegal. Whenever a State organ, official or public entity violates one of those rights, this constitutes a failure of the duty to respect the rights and freedoms set forth in the Convention. 170. This conclusion is independent of whether the organ or official has contravened provisions of internal law or overstepped the limits of his authority: under international law a State is responsible for the acts of its agents undertaken in their official capacity and for their omissions, even when those agents act outside the sphere of their authority or violate internal law. 171. This principle suits perfectly the nature of the Convention, which is violated whenever public power is used to infringe the rights recognized therein. If acts of public power that exceed the State's authority or are illegal under its own laws were not considered to compromise that State's obligations under the treaty, the system of protection provided for in the Convention would be illusory. 172. Thus, in principle, any violation of rights recognized by the Convention carried out by an act of public authority or by persons who use their position of authority is imputable to the State. However, this does not define all the circumstances in which a State is obligated to prevent, investigate and punish human rights violations, nor all the cases in which the State might be found responsible for an infringement of those rights. An illegal act which violates human rights and which is initially not directly imputable to a State (for example, because it is the act of a private person or because the person responsible has not been identified) can lead to international responsibility of the State, not because of the act itself, but because of the lack of due diligence to prevent the violation or to respond to it as required by the Convention. 173. Violations of the Convention cannot be founded upon rules that take psychological factors into account in establishing individual culpability. For the purposes of analysis, the intent or