> downside of Hyundai just making all the info in this blog post public info? All the CAN protocol data being public means there's no need for expensive docume

> downside of Hyundai just making all the info in this blog post public info? All the CAN protocol data being public means there's no need for expensive documentation, proprietary scan tools or trips to the dealership for key/module programming if it's all been reverse-engineered (a lot of programming and security-related things in cars are more down to obscurity than actual public-key-cryptographic authentication). Hell, it may even remove the need for expensive modules (over 1k bucks for what is essentially a slow microcontroller on a conformal-coated board running shitty firmware) if the docs allow third-parties to reimplement module functionality on the cheap. It would also blow up any future attempts at subscription-based heated seats or A/C if the published docs make bypassing it trivial.