GM and John Deere are both pushing back against rules that would allow exemptions to the DMCA that might let you take your new car to any mechanic you want to. Because, as far as they’re concerned, they still own the car. It’s a little like Monsanto saying that if you buy their seeds and a few of them fall onto your neighbor’s land and your neighbor plants them or sells them, your neighbor will be in big trouble. It’s kind of like that.