scripting setup: unique login for member site

I want to have my currently running website with wordpress and wordpress direct to have a one of the page on the site that can only be accessed with a unique member login/password that is purchased. I want the video to be streamed (not live streaming) so it cannot be "downloaded". I have an AS3 account and paypal account. 1)develop a unique member script for the website. 2)setup website backend so it works with paypal 3)setup so each member could register using their unique username and password. 4)setup page display to those member who have subscribe to view . 5) set the expiry for each page so that the page are not available after certain period. 6)upload video to as3 server