How to tell what protection is on Disc?

I would like to know:
How can I find out the protection method on a disc?
Is it a program that you need to read the protection style or a list or is it written on the cover etc…

My Story,
I got a DVD from focusmm.co.uk (driving DVD) and made a copy with Alcohol 120%. I used the alcohol drive to mount the image and tried to install it but it recognized it as a virtual copy and so refused to do so. So I installed it via the Original and then all works. I then run it from the virtual drive (The DVD is on the shelf now) and it totally works. This has enabled me to keep the DVD safe while having the full functionality of the program.

I dont know what protection it is so I cant say much more.

Happy days for me though, thanks to alcohol 120% and this forum.

Welcome Kent22,

take a look here.