Besides all technical measures to ensure a proper data protection, the visitor is informed by the organizer (data protection and terms and conditions) about the possibility to be scanned by exhibitors and the transmission of his personal contact information.
By showing his badge to be scanned, he is declaring his consent by implication in every single case. This process design and legal interpretation was confirmed by our lawyers. If the visitor disagrees during the registration or even later, his record is blocked in our system and you will see the message "no data available". So you will receive all visitor data fully compliant to the GDPR.