> How about non-approved images pumping power upstream above regulatory limit on RF?
This is possible through other means (you can buy RF chips and wreck havoc on the frequencies). And it's illegal to do so anyway.
>Or overclocking the CPU? Or reporting all keystrokes to a place of your choice?
I, the owner of the device, might want to do this and these are sometimes completely reasonable things to do (if you're a developer, for instance).
> Would you, as a manufacturer of the device, like to make that easily possible?
Probably not, but that goes against the interests of the customer. ("but most of them won't care anyways")
> What makes it impossible is not the secure boot but the fact that the _unauthorized_ 3rd parties don't have the keys for signing stages of the images.
I am completely fine with this if, and only if, I can add my own secure boot keys and sign my own firmwares/OS images which allow.
I, the owner of the device, should be an "authorized" party when it comes to my device.
I am willing to accept that I do not get 8k service from YouFlix Inc if I add my own keys.
I have no problem with secure boot (the technology) but I do take issue when it is used to limit the rights of the owner to their own device.