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You compare it to the cost of developing and certifying a new safety critical system. I recommend the recent talk from the team that investigated the Polish train corruption scandal. It goes into the hardware and software on these older train systems. They're essentially using them as PLC controllers, not as networked general purpose machines.

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Hold on, the criticality of the system they were developing was not that high, in the end they could use Linux, which to my understanding is not certified for any ASIL D application.

That with the scandal sounds interesting, so you have any pointers where I can get a good sum-up? :)

Last I checked a report is being prepared for presentation to the legislature. The conference talk is at https://media.ccc.de/v/37c3-12142-breaking_drm_in_polish_tra...

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