GM trying to keep you from modding your vehicle

Most software is not owned when you write that check, hand them the green, or put it on plastic. If you read the licensing agreement for your iPhone, Android, Mac, Windows PC, laptop, or tablet, it will tell you you own the hardware, but any firmware/software you are only licensed to use, do not own, and must seek permission to change or redistribute, they are protecting their R&D dollars, as well as covering themselves should someone make a change that disables a safety feature. I guess most auto manufacturers will jump on that bandwagon if they have not already.