Windows 2003 Server Client Access License

I would like to install 5 servers with Windows Server 2003 Standard Edition, with 1 as the main DNS server, controlling the Active Directory, while the rest of the servers are configured as member servers. I purchased 80 user CALs for this Win 2003 srv software. Can I use this same software to install on the other member servers without purchasing separate 80 user CALs for each member server?