Some customary international laws rise to
the level of jus cogens through acceptance
by the international community as non-
derogable rights.
What is jus cogens?
jus cogens(A peremptory norm) is a
fundamental principle of international law that
is accepted by the international community of
states as a norm from which no derogation is
permitted.
e.g. prohibition of genocide, maritime piracy, slaving in
general (to include slavery as well as the slave trade),
torture, refoulement and wars of aggression and territorial