that one is often down and or dead
it has ONLY one 1 and 1 rpm only in it "libdvdcss"
do not worry about that one
for fedora 13 see Mjm's fedora 13 help pages
yum and repos
also BE ADVISED the fedora system admins caught someone trying to break into some of the servers
so some of the mirrors may be down
see:"Fedora Infrastructure Intrusion But No Impact On Product Integrity - Jared Smith"
AND DO NOT use the --nogpgcheck tag unless you DO want to take the risk of installing hacked/cracked software
it is not a good or wise idea to use that tag ever -- unless one MUST as a LAST RESORT to install a rpm