I think this is necesary to maintain a site with no leechers. Look and examine your partner's bulletin board...VBulletin!
ew...why kind of site has leeches? Perhaps one about medieval medicine I suppose, or bloodsuckers.
vB? Partners? You don't say.
That is coming in maybe 6.3-6.5 or so as an extension of the security group, but can be done as a modification before then. We do that presently with polls, you have to be a full member to be able to vote... keeps people from signing up new names just to run the vote up.
I don't think our "partners" have leeched many scripts from us, but they have been known to use our graphics.