How to get VAC2 on a CS 1.6 server?

Hey,

I have a prob with the CS 1.6 server of a friend... can't get VAC2 on it.
What should I change to get it?

Is this the only thing I have to change or are there any other commands?
liblist.gam -> secure "1"?

Maybe the Gamehoster (Quado.net) has made a mistake...

Thanks in advance for your help!

maniac