IRM – Information Rights Management

Configure IRM to use an on-premises AD RMS server
https://technet.microsoft.com/en-us/library/dn151477(v=exchg.150).aspx

Configure IRM to use Azure Rights Management
https://technet.microsoft.com/en-us/library/dn151475(v=exchg.150).aspx
Plan Information Rights Management in Office 2013
https://technet.microsoft.com/en-us/library/cc179103.aspx