how can I force customers to log in before seeing purchased video content?

Hi There,

Is there a way to give the customer an url where he automaticaly can see a video tutorial after he has logged in on my website?
So if he isn't logged in, he won't see the video tutorial. After he has logged in and click on the url in his computer which is provited by the download he has bought, this url will be linked to a secure folder on my server and can watch the tutorial. That's to provide piracy. If he gives his inlog and password to someone else, that person can make orders in his name.

Regards.

Or is it possible to put a link in the order information? That way you're already logged in.