Hi there
not sure how to block what's actually downloaded but you can "Blacklist" sites etc. It won't work if you actually try and block a video file "per se" --after all if the user saves as a ".zip" or even a "txt" file how will your system know a video file is being downloaded. Even more difficult if the download is done Indirectly and then sent as an email attachment -- although some email services might "moan" at a 4GB or so attachment.
Your best bet is to do this by attrition --set up a proxy server, log sites accessed and gradually block these.
However once you allow ANY download it doesn't take a very smart kid to find 1001 zillion ways around any sort of parental control or other safety scheme.
The only SURE way to stop this type of activity is to block ENTIRE access to the internet.
A partial solution is to allow NO WRITE access or CREATE privileges on ANY HDD and block any external USB devices from being installed. However to get windows to function it does need some write access on TEMP type files so I pass over to more technical guys who might have a better answer.
Cheers
jimbo
