John Tapsell tapselj0@cs.man.ac.uk cites:
The trademark Obelix was registered by German lawyer Guenter Freiherr v. Gravenreuth. The legal charge is up to 250.000 USD or six months prison. The costs of the first instance are app. 15.000 USD. Werner Heuser has decided not to withdraw the name "MobiliX".
The problam is that "Obelix" is probably a well-known trademar and not easily refuted -- and it can clearly be shown in court that "MobiliX" and "Obelix" sound confusingly similar. Looks like a lost case, IMHO.