Hide username of the last person posted in a private forum

Is this available? I have a couple of private forums and wouldn't mind it if it was possible to have a way of hiding the last person that posted, like the same way that UBB uses.

I'm sure it is a template mod and not a hack, but if i'm wrong i apologise.

Thanks

[Xenon]

why don't you hide privat forums?
so they won't be visible to not permissioned users and so these cannot see who posts last

[A.T.F]

Because the private forum is the most popular forum on my board, and you need a certain amount of posts to enter this forum, and i don't really want others who do not have that number of posts to see the last author.

Is this not possible i take it?