To plan the amount of parking space needed, a local government monitors and saves the license plate number of every car that enters and leaves the city center. They have obtained permission to collect data on the number of cars present in the city center. By comparing the license plate time of entry and exit the number of cars present every moment of each day is calculated. Each month a report is created detailing the average number of cars in the city center at specific moments for every day of the week. At every entrance to the city center, a billboard clearly states what data is collected by whom, the purpose of the processing and the fact that the license plate numbers are saved securely for up to two years, because the measurements will be repeated next year. Which of the basic principles for legitimate processing of personal data is violated in this scenario?