Part of it is liability management, where suppliers need to ensure that their customers are providing a certain level of security, whether that's an ag retailer for a manufacturer, or a farmer for the ag retailer. That's part of the driver.
Certainly security agencies around the world--European, North American, etc.--are driving the security regulations. The U.S. regulations require registration of farmers in order to purchase ammonium nitrate. So they've gone the full length in their security requirements.