Restrictive Laws — A myriad of laws, customs, and rules constrain the inhabitants of this world, and even acts that are completely permissible elsewhere are punished severely here. The locals may provide lists of these laws to offworlders, but few non-natives can hope to master all the important intricacies.
Theocracy — The planet is ruled by the priesthood of the predominant religion or ideology. The rest of the locals may or may not be terribly pious, but the clergy have the necessary military strength, popular support or control of resources to maintain their rule. Alternative faiths or incompatible ideologies are likely to be both illegal and socially unacceptable.