Can I legally use my installation CDs on more than one system, so long as I only seek support on the system using my subscription?

You can install the software on as many systems as you would like and you can share the software with others. However, as a condition to obtaining the software you agreed to pay for a subscription to Red Hat Network (RHN for each system on which you installed the software. If you use an RHN subscription to obtain content used to support more than one machine or you distribute content obtained over RHN to other parties, you have breached your subscription agreement, and Red Hat has the right to deny you further service under RHN (i.e., you will no longer be able to obtain bug fixes, security patches, updates, or enhancements).

If you need additional subscriptions, click on the STORE link at the top of redhat.com or contact your Red Hat sales representative.