Because it doesn't allow users to install software modified by them, which is a requirement in GPLv3.

And then the user loses the certification, as you said in another reply[1] the “user” you're talking about are other companies, so I don't see why they would decide to break the certification they got from their supplier just for fun.

Edit since the parent was in fact speaking about the end-user, which I misunderstood: I don't see the problem either. The manufacturer has no obligation to prevent the end user from updating his car's software. There is no locks that prevents the car owner to just disable his airbag[2], or remove the safety belt. It's illegal to do so in most countries, and if the user do do and injure himself or somebody else because of that modification, they are on their own. I don't think it should be any different for software actually.

[1]: https://news.ycombinator.com/item?id=26397176 [2] Edit: in fact, this is a bad example, because you need to be able to disable the airbag to put an infant car seat next to the driver.

No, the user that matters for GPL is the car owner. The point in the linked comment is that given how the market works, there is little incentive to work towards changing regulation (or even just interpretation of or belief about the regulation, I have clue if there are actually countries where this is impossible, but know for sure it's a widespread belief in the industry), because the company applying for certification is not the one getting annoyed by having to avoid GPLv3.

I obviously meant end users in this case.

The chain of software delivery often looks like this:

Small subcontractor delivers parts of system→ big company provides ready to use solution → hardware vendor uses the solution and gets their devices certified → end user uses the final product

In this case, the hardware vendor is mostly interested in having their devices work as intended. Everyone up the delivery chain has to meet their requirements in some way to basically get paid. That's not a position where it's easy to make demands regarding certifications, since the hardware vendor may just go to someone else.

if your car kills your kid, eg the airbag misfired, or the lane assist went into oncoming traffic, then the car vendor will look for any opportunity to evade and refute responsibility. including claims of self tampering with the car. now in the burnt wreck, forensics need to show beyond doubt that it was, indeed, the car vendors shipment that killed the kid. how do you show as DA, that indeed the software was untampered with?

drm.

ps: airbags not working is less of a software problem than airbags misfiring.

Not a lawyer, but I don't think that's true.

GPLv3 says that manufacturers have to release all the information needed to run modified software on the device, it doesn't mean that there is one (and one only) certified version that can legally run on the device for safety reasons.

GPLv3 in this case would force manufacturers to release the information so that the owner of the car could run modified software, but legally if you do it, you, the user, not the manufacturer, are violating the law.

It's the same thing that happens with electronic blueprints, you can modify the HW, it will void the warranty if you do it.

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Protecting Your Right to Tinker

Tivoization is a dangerous attempt to curtail users' freedom: the right to modify your software will become meaningless if none of your computers let you do it. GPLv3 stops tivoization by requiring the distributor to provide you with whatever information or data is necessary to install modified software on the device. This may be as simple as a set of instructions, or it may include special data such as cryptographic keys or information about how to bypass an integrity check in the hardware. It will depend on how the hardware was designed—but no matter what information you need, you must be able to get it.

This requirement is limited in scope. Distributors are still allowed to use cryptographic keys for any purpose, and they'll only be required to disclose a key if you need it to modify GPLed software on the device they gave you. The GNU Project itself uses GnuPG to prove the integrity of all the software on its FTP site, and measures like that are beneficial to users. GPLv3 does not stop people from using cryptography; we wouldn't want it to. It only stops people from taking away the rights that the license provides you—whether through patent law, technology, or any other means.

https://www.gnu.org/licenses/quick-guide-gplv3.html

The key point is if certification is possible for a device that allows arbitrary software to be run or not. If it is, we have your scenario. If it isn't, it's not possible. I don't know if the former case is true for all countries, I certainly know that the market overall believes it's not, or not worth the hassle of arguing it with other companies and regulators.

As I understand it the manufacturers need to release only the information, nowhere GPLv3 says that the manufacturer should make the process of running custom software easy or economically viable, just that the information should be available.

But as I've said I'm no law expert and I wouldn't put my hand on fire about it.

I'm sympathetic to Stallman's goals, but for some applications this presents a huge problem: if anyone can modify their car's auto emissions software, everyone can play Volkswagen and make their car high-performance and dirty as hell. Or people can extend the range of their WiFi by exceeding the legal power levels for unlicensed bands and making a frequency band unusable by their whole neighborhood. Or, modify someone's medical device's software to provide a very sneaky way of killing them. Now, there may be a way to solve these problems, but it would probably involve adding some unchangeable mechanism to limit the behavior of the device to keep it safe. But that's very difficult to do. Certifying that a fixed program has certain safety properties is difficult but possible; certifying that a new kind of design that allows users more freedom to tinker, but not too much, is much harder.

Why certifying specific version of software would conflict with GPLv3?