A multi-stage ejector pump having an ejector nozzle system with the nozzles situated coaxially behind each other and axially set apart from each other by a spaced distance. If the commands are recognized by the selection device as belonging to a certain personalization method, the selection device activates that personalization interface of the data carrier that supports said personalization method. Responsive to the attack on the first CDN, a rate limit is established in the first CDN on at least the content requests received by the first CDN and an indication of the attack is transferred for delivery to at least a second CDN.