Hello There! Backstory: So basically three years ago I bought a macbook computer off the school, understand this I BOUGHT it. It is legally mine. And a few days ago when I tried to use the "Screen Sharing" application it came up with a pop-up saying "You are not authorised to do this". So I thought this was a bit odd and so I tried a one or two other applications and they have roughly the same popup. I just want to know a way to bypass this due to the fact that I NEED Screen-share. Anyways any help would be much appreciated, thanks. EDIT: IT department was unwilling to help me, any help would be much needed.