You as an exhibitor receive the data of the visitors which visitor badges you scanned in conformity with the data protection law. When the visitor registers for his access ticket to the fair, he gives his consent that the data can be forwarded to the exhibitor when using the Scan2Lead service. According to the provision of data protection law, he has the right to object. If the visitor makes use of this right, you will see 'no visitor data available' when scanning the badge.