Here are tips and tricks about AD/Azure RMS:

Azure RMS blog: http://blogs.msdn.com/b/rms/

RMS for externals: https://blogs.msdn.microsoft.com/rms/2013/11/18/rights-management-licensing-terms-for-orgs-and-isvs/

Azure RMS Documentation: http://blogs.technet.com/b/rms/archive/2016/03/31/announcement-azure-rms-documentation-library-update-for-march-2016.aspx

PowerShell for Azure RMS: https://technet.microsoft.com/en-us/library/jj585027.aspx

Comparing Azure RMS and AD RMS: https://technet.microsoft.com/en-us/library/jj739831.aspx

Whitepapers about RMS: http://www.microsoft.com/en-us/download/confirmation.aspx?id=40333

 

PREVIOUSLY:

How AD RMS works: http://technet.microsoft.com/en-us/library/how-adrms-works.aspx

AD RMS concepts: http://blogs.technet.com/b/rms/archive/2012/04/16/ad-rms-infrastructure-concepts-part-1.aspx

Hosting the AD RMS Servers in an Internal Network and Publishing Them to the Internet through a Reverse Proxy with an Application Layer Firewall: http://technet.microsoft.com/fr-fr/library/dd996632%28v=ws.10%29.aspx

Making AD RMS Available on the Internet: http://technet.microsoft.com/fr-fr/library/hh311037%28v=ws.10%29.aspx

AD RMS best practices: http://technet.microsoft.com/en-us/library/jj735304.aspx

Operations: http://technet.microsoft.com/fr-fr/library/dd772674%28v=ws.10%29.aspx