Does a user’s computer have to be joined to the same domain as the RMS server to use RMS?
The user’s computer does not have to be a member of the same domain as the RMS cluster, but the computer needs to be able to find the RMS cluster. The easiest way for client computers to find the RMS cluster is by using an Active Directory lookup through the service connection point (SCP). However, registry settings on the client can also be set to locate the RMS cluster without using an Active Directory lookup. The exact registry settings depend on the RMS-enabled application.