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It appears as though Tesla is using at least some GPL'd software in their vehicles. The Linux kernel, for starters.
The GPL requires that anyone who uses code covered by the GPL release the changes or enhancements they've made to the code to the users who purchased the product that uses the code.
Tesla appears to be negligent in this regard.
How do we force Tesla to release all their code changes ?
My first thought is to utilize social media to do this. Elon seems responsive on Twitter. I don't post on Twitter. Could someone with a large Twitter following ask Elon about releasing code ?
If no response, I suggest Tweeting prominent members of the open source community. Maybe Linus Torvalds ? Greg Kroah-Hartman ? I'm sure that members of the community think it is only fair that Tesla a) acknowledge all the work that they've contributed to Tesla's cars and b) contribute their changes back to the community, in kind.
As far as I am concerned, Tesla has had more than enough time to share their changes. I'd be interested in making a pretty big media fuss about this until they comply.