Microsoft just shipped Rights Management Services (RMS) Service Pack 1.
It is Microsoft's latest release in the Enterprise Rights Management (ERM) space. It comes with a host of new features to improve deployment, support for high security environments like air-gap networks and conforms to FIPS standards.
More importantly, SP1 provides support for a host of server-side solutions to be RMS-enabled.
Check out the ten great things about SP1 : http://www.microsoft.com/windowsserver2003/evaluation/overview/technologies/rmstopten.mspx
You can download RMS SP1 for windows server 2003 (this is the RMS server) at the following Url : http://www.microsoft.com/downloads/details.aspx?FamilyId=8EF6D80A-6A9C-4FB9-AB51-790980816FFE&displaylang=en
The client software is available at the following Url : http://www.microsoft.com/downloads/details.aspx?FamilyId=A154648C-881A-41DA-8455-042D7033372B&displaylang=en
More information about RMS : http://www.microsoft.com/rms