How to create FTP user with read only access?

Hi there!
I designed a web site and the owner wants to get quotes from other designers on extra features I don’t have time to code right now. He asked me to give him the FTP PASSWORD to get quotes!!! So after I got done explaining why giving carte blanc access to his site is a BAAADDD idea, I need to figure out a way to give read only access to just one FTP user (a temporary one) so they can look at the code. Also, will this prevent them from downloading files? I understand about protecting his intellectual property even if he doesn’t.

Any advice for how to do this would be appreciated!

Ok, so why should I care right? Guess I’m just a softie. ::sigh:: USERS!!