I know you are, but you hinted that even stuff you didn't know about could land you in hot water with Paramount, and you've indicated that fans creating stuff could cause real IP problems. It would seem prudent to include statements or warnings to that effect where you know customers will see it (i.e. the rules). From a legal perspective I could see that, heavens forbid, you did end up in some legal wranglings, it would stand you in good stead if you had done that as you could then argue that you has done as much as was reasonably practicable to prevent IP infringement by doing so. Just my $0.02