Article 7- Special procedural rules
2.Except for cases provided in article 340 of the Code for Criminal Procedure, trials of cases by courts for serious crimes and by courts of appeal for serious crimes also take place behind closed doors when this is seen as necessary for the case at trial or for other proceedings, in the interest of national security, public order, justice and the protection of participants in the trial.
1. States Parties shall, in accordance with the provisions of this Part and under procedures of national law, comply with requests by the Court to provide the following assistance in relation to investigations or prosecutions:
(j) The protection of victims and witnesses and the preservation of evidence;