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.
Fair trial standards
Victims' rights
Protection of national security
Protection of safety of physical or psychological well-being of victims, witnesses and families
Witnesses' rights - national proceedings
Witness protection - national proceedings
EDIT.