

They are not illegal heroes, they are pentesters and were paid by train company SPS who were using these trains.
https://media.ccc.de/v/37c3-12142-breaking_drm_in_polish_trains
They had a talk at CCC 2 years ago, and last one too I think. It’s pretty funny.
They constantly do, it’s just for less flashy stuff like drivers or kernels so no one cares.