photographer uploads, client buys - one2one system?

Hi there,

Is there any mod available that will allow photographers to upload photos and then allow users to pay and download the photos, but the user can only access the photos if they have a password to the photographers portfolio.

Basically I am creating a website for birthday photographers who wish to sell their photos to their client. I need something that will allow the photographer register, upload their photos, so the client can also register and download selected images. The images will only be available to one client/customer, so somehow the photographer will need to be linked to the client. I thought possibly a password to access the photographer's portfolio/images.

Does such thing exist? If not, I am willing to commision someone to build this mod for me.

Many thanks!