Tag/Search Keyword filter

[Sugandya]

Hi,

I would like to know if there exists a filtering system for Coppermine. I run an art site, and some of the artwork may contain content that I don't want shown to a non-member.  If not, I'd like to know how to go about implementing this on my own.

I saw it being mentioned here, but that was the extent of it.

Each user has their own gallery.  I know I could block certain albums and just do that, but I would rather try and create more of a tag-filter type system; nothing complicated.

Any hand-holding is be appreciated! 

[Sugandya]

To clarify (since I can't edit my post):
I'm looking to make this or if this exists-- a method of "flagging" a submission to the gallery to be viewable to a certain group  (i.e. members vs. guests)