Protective jurisdiction allows a state to prescribe laws over acts committed abroad by non-nationals where those acts pose a genuine threat to the state’s vital interests, even without a territorial or nationality link. Traditionally applied to crimes such as counterfeiting currency, falsifying official documents, or pirate broadcasting, it is today also invoked against serious offences like drug smuggling and international terrorism. The principle is narrowly applied and reserved for conduct universally regarded as unlawful, distinguishing it from the broader and more controversial effects doctrine.