69125 File Download system

What I need is a database driven file distribution system in php/mysql. A program that will allow end users to log in with a unique username and password and retrieve files (in many formats, images, videos, documents etc..) There will be three types of users on this system. Master user - who has complete control over all other users and their accounts... Including add the files for the other user types to download. Certified User - Will have complete access to all of the folders and files in their account. But are limited to their account only. Standard user - Only has access to download the files in the folders of their account that the master user specifies... Each user will have 1 account that will be used over and over by the master user to distribue files to that user. There should be a master control panel for creating accounts and adding files. That would be it... If you have any questions needed to make your bid please PM me. Thank you