Enforcement of the arbitral award. Nullity of service of process by letters rogatory received by a third party. Judgment creditor who failed to discharge the burden of proving that the legislation of the foreign country would authorize service of process delivered to a third party (which should have been demonstrated through a notice from the Ministry of Justice, consular certificate, or opinion of local lawyers). Construction of Decree 1.899/96 and Article 376 of the Code of Civil Procedure: