The International Driving Permit has been around for decades, but now there's a new wrinkle. For the first time, at least one European country (Italy) requires drivers from outside the EU to have the IDP. Even in countries where it isn't required, the International Driving Permit is worth having just to make sure that your driver's license is accepted by local car-rental agencies and traffic police. What the IDP is--and isn't. The International Driving Permit is an official document that certifies the validity of your home driver's license in 10 languages. It's a valid form of identification in 150 countries on six