During the kicking a ball around a green field with a lot of people watching event during a hot season in germany, they almost shut down the ball kickers team busses of the hosting nation down by said logo issue.
Since Mercedes (the producer of the team busses) was not a official sponsor (that was Hyundai, ehich didn't produce any busses afaik) they had to remove the mercedes logo. Tough luck was, they had radar sensors in the logo, so covering it would hve shut down the electronic (at least according to the press reports).
Whats really rediculous is, that even when a official sponsor can't provide a certain product or service, the other logo has to be removed. Even if you are official supplier to a participating team but not an official sponsor you can't show your logo.
I'm wondering when we have the first non-state entities being recognized as souvereign states... Hell, then you could even tax your own employees! :-)