Determining the video url is done on pwnyoutube's server and they can set whatever referrer (or none) they like. The real question is whether Youtube will start checking the request ip address and block pwnyoutube's. But then just put the site in a cloud.
My experience is that Youtube combats this (either intentionally or just by way of code changes) by changing the method in which the flv urls are determined by the player. The download sites break until they reverse engineer, and the cycle continues.
My experience is that Youtube combats this (either intentionally or just by way of code changes) by changing the method in which the flv urls are determined by the player. The download sites break until they reverse engineer, and the cycle continues.