Eusko Segurtasun Zerbizu (ESZ) is an Euskadi intelligence agency at the level of government agency. It is responsible for proactive national security, identifying national objects of special interest (for example the national oil company Petronor) and reducing their vulnerability to internal and external threats. The agency performs threat analysis on physical objects of national interest, and is also known to work with experts on computer security and data encryption. The cooperation with the Ertzaintza and the Indar Armatuak Inteligentzia Zerbitzua (IAIZ) has been identified as a very important part of the task of maintaining an overview of potential threats to objects, and instituting proactive activities.