Ergo said:
Ok. If you receive an email that there is a trademark infringement and don't cancel the name. What happens then? As I understand the worst thing is that you will loose your domain? Or is there something worse than this can happen?
There is a good chance that nothing will happen, Cease and Desist (C & D) letters, as they are called, cost a company very little.
If they decide to pursue the matter then you will get, at the email address listed for the domain, a copy of a UDRP complaint. You get three weeks to answer, in proper legal form. If you do not answer your registrar will probably, but not certainly, be told to give your domain to the complaintant.
You can answer yourself, that will cost you next to nothing, but the odds are much better in your favor if you hire a domain specialist lawyer. An ordinary attorney would be of very little use. Figure around $5000 your cost, win or lose.
The panel(ists) get only $1000 each so do not expect them to put much time into the case. Decisions are rather random, but often favor the corporations, and are often appear to have an anti-domainer bias.