To me this doesn't really look like a clear cut case. Does he own one of these cars? If not, then I think it is very dubious whether he has any standing to request the source code. If he does then included with the car should be an offer for how to access the GPL source code. He should have followed that (or clearly stated that he could not locate it in his email). The requirement for him to enter the VIN to access t…
No, the offer for source must be to anyone -- the supply of a binary may be limited. BMW cannot be the "sole owner" of the copyright -- even if they own the part they wrote, they must still supply source for the GPL parts.
Source: https://www.gnu.org/licenses/gpl-faq.en.html#GPLRequireSourc...
BMW does not have to provide the sources to everybody. Only to its users.
edit: tzs also has a point. Hm?