Court practice heavily relied on traditional customs or rules described as customary. He only seldom adhered to traditional patterns of depicting customary mythological subjects. It was a formal written code, not merely a collection of customary practices. It is uncertain as to what extent the Convention codifies customary international law. Many legal scholars cite the UDHR as evidence of customary international law. Unalienated land is owned under customary title by traditional landowners. The French administration typically respects decisions made in the customary system. These regulations are a reflection of customary international law. There are several kinds of customary international laws recognized by states. It has a mixed legal system of civil law and customary law. It guarantees various rights within the framework of Qur'anic and customary law. During this period most regions returned to customary and religious law. It has a common law system influenced by customary law. Such were cultures heavily influenced by customary legal systems. Flags in Poland are used according to a customary, rather than legal, flag protocol.