[Plug-In : NextGEN Gallery] Password protect albums?

Hi!

Would anyone know whether it would be possible to password protect albums when using NextGen Gallery?

In fact, I’d like to upload photos for my clients – so they can see and download their shots. I’d make an album per client (with different galleries for each if need be, included in the albums)

But I don’t want everyone to have access to everyone’s pictures, so I was thinking of creating a password protection for each album, and give the clients their own password-protected directory.

Because wordpress directories are “virtual”, I don’t see how to do that. Anybody’s got a thought?

Thank you!