Is it 50% or 40

50% you lose it.. so anything under you get it back.

http://forums.d2jsp.org/info.php?p=26

tanks

Just so you know, sometimes you don't get back those privileges with warn reduction.. I've seen cases where people have gone under, say, 50%, and still had sig rights gone.

that's for other instances though.
just for warn you do get them back.
i'm 99% sure.

This is true
If u lost them because of your warn you will get them back, if your warn reaches 40 %