Also RHEL 6.4 ( the current )
is not a free operating system
you MUST buy a "support contract" !!!
https://www.redhat.com/apps/store/desktop/
there is no real way around this !
if you do not then do not use RHEL !!!
instead install one of the FREE rebuilds like
CentOS 6.3
ScientificLinux 6.3