Hmm..it means whatever they want it to mean..I've seen everything from 'I don't care', to 'I take this SERIOUSLY and I DO PROSECUTE (no, I'm not making that up..
I think it means that if you use something commercially, you have to get permission, and you may or may not even have to fork over some of the profits..just my guess..

I wish I'd said that.. The Staircase Wit

anahl nathrak uth vas betude doth yel dyenvey..;)