In one of the coolest and more outrageous repair stories in quite some time, three white-hat hackers helped a regional rail company in southwest Poland unbrick a train that had been artificially rendered inoperable by the train’s manufacturer after an independent maintenance company worked on it. The train’s manufacturer is now threatening to sue the hackers who were hired by the independent repair company to fix it.
After breaking trains simply because an independent repair shop had worked on them, NEWAG is now demanding that trains fixed by hackers be removed from service.
C3 talks are available online for quite some time after the actual event, so you might still be able to watch it then.
Where “quite some time” is “indefinite”. Proper archives go back to 2002, 19c3.
Takes some time for stuff to show up in the archives though as start+end get cut manually, while the congress is running there’s always an archive of raw steam dumps maybe that’s the one you mean.