A NEWAG Impuls HMI complaining about copyright violation on cabin controls.
https://object.ceph-waw3.hswaw.net/mastodon-prod/media_attachments/files/111/528/168/018/250/594/original/427679a497b44350.png
The key unlock was deleted in newer PLC software versions, but the lock logic remained.
After a certain update by NEWAG, the cabin controls would also display scary messages about copyright violations if the HMI detected a subset of conditions that should've engaged the lock but the train was still operational.
The trains also had a GSM telemetry unit that was broadcasting lock conditions, and in some cases appeared to be able to lock the train remotely.
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