At the same time, the investigation into the case is still under way, though the man in question from Kisvárda, in eastern Hungary, is no longer a suspect, the public prosecutor of Szabolcs-Szatmár- Bereg County said in a statement.

After hacking into BKV’s new e-ticket system developed by T-Systems Magyarorszag and buying a monthly travel pass for 50 forints (around 15 euro cents), the man alerted BKK to the IT flaw.

After police named him as a suspect, several organisations protested against the authorities pursuing a criminal probe into an ethical hacker and a demonstration was held in front of BKK’s headquarters.

Republished with permission of Hungary Matters, MTI’s daily newsletter.