Azure & Active Directory Center

Active Directory Rights Management Services (AD RMS) is an on-premises information rights management solution that ships with Windows Server. It uses encryption and a form of selective functionality denial for limiting access to documents such as corporate emails and Microsoft Office documents, and the operations that authorized users can perform on them.

In Exchange 2010 users can create distribution lists that are visible to the whole organization through Outlook Web App in the user Options.  By default these are created in the Users OU in Active Directory.