Why can't I extract sub from DVD?

[benimaur]

Hello everyone,
I tried to extract subtitle from "Four weddings and a funeral" by VobSub Ripper Wizzard, but I ended up with a zero sized .sub file.
why? Is anything wrong with my disc?:confused:

[setarip_old]

Hi!

It's likely that you first have to decrypt your DVD and copy it to your hard drive...