CHAPTER IV
HUMAN RIGHTS

42. Arrest, detention and fair trial

(2) Every person arrested for, or accused of, the alleged commission of an offence shall, in addition to the rights which he or she has as a detained person, have the right —

(f) as an accused person, to a fair trial, which shall include the right —
(vi) not to be convicted of an offence in respect of any act or omission which was
not an offence at the time when the act was committed or omitted to be done, and not to be sentenced to a more severe punishment than that which was applicable when the offence was committed ;

Article 11
Jurisdiction ratione temporis
2. If a State becomes a Party to this Statute after its entry into force, the Court may exercise its jurisdiction only with respect to crimes committed after the entry into force of this Statute for that State, unless that State has made a declaration under article 12, paragraph 3.

Article 24
Non-retroactivity ratione personae
1. No person shall be criminally responsible under this Statute for conduct prior to the entry into force of the Statute.
2. In the event of a change in the law applicable to a given case prior to a final judgement, the law more favourable to the person being investigated, prosecuted or convicted shall apply.