This is probably a newbie question, so please forgive me if it has been covered, but many time when I am trying to download a video file, and then preview it, I get a message that says "acquiring license". At this point I stop the download for fear that a destructive program, etc. will be downloaded to my pc.

What is going on here and is it safe to acquire the license? Is this a one-time thing or are there numerous licences that have to be acquired? Can I only downloads that don't require this license?

Thank you for any help.

Kim