Restricting access to a single directory in the manager

I've created a directory called '_userfiles' where I'm storing all the uploaded files (e.g. images, PDFs, etc) for my site. For editors I would like to restrict access to only this directory and its sub directories. How can I do this?

Check out http://rtfm.modx.com/display/revolution20/Creating+a+Media+Source+for+Clients+Tutorial it should do what you want.

Perfect! Thank you very much.