Working on the Car at home...

[hazard]

The DMCA isn't going to help car manufacturers in Europe though, but Europe's own intellectual property laws may offer them similar protections. The major question is going to be if you can hand off a car to any garage or if you specifically need an associated mechanic that's licensed to work on a given brand's cars. If it's the latter I can see a trust busting suit being successful, after no small amount of legal wrangling, if there's still an unaffiliated garage industry to speak of.