The Microsoft® Windows® Rights Management (RM) client is required for your computer to run applications that provide functionality based on Windows RM technologies. Installing this client places software on your computer that allows RM-aware applications to work with Windows Rights Management Services (RMS) to provide licenses for publishing and consuming RM-protected information.
Supported Operating Systems: Windows 2000 Service Pack 3, Windows 98 Second Edition, Windows ME, Windows Server 2003, Windows XP
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News source: Microsoft Download Center