Video downloader

I need a windows app that I will distribute through my site 1- This app will help users download videos in .flv and .mp4 format from the site [login to view URL] 2- This app must also be able to detect the address of videos hosted on these sites and then download those videos: [login to view URL], [login to view URL], [login to view URL], [login to view URL], [login to view URL] 3- User will download the app on his desktop, when executed, the app will create a folder in c:/ this folder will be called myvids 4- The app will always be on the lookout for video streams, when user opens a page with a stream, app will search the script of the page, it will find the location of the vid and will download the vid to the folder c:/myvids/ 5- I want my users to be able to use the app 5 times before they have to buy it, so the app must note the ip address so that user cannot download the app after he has been through his 5 tries 6- After they have bought the app, user will have a 1 year license 7- I want the app to be encripted so that users cannot open the app to copy the code 8- Size of interface should be about 800 x 600 pix