Final answer:
To protect documents in SharePoint with AzureRM, enable Information Rights Management (IRM) directly within the SharePoint admin center. This ensures document encryption and adherence to the specified authorization policies.
Step-by-step explanation:
To ensure documents in a SharePoint Site are protected by Azure Rights Management (AzureRM), you would enable Information Rights Management (IRM) on the SharePoint site. This is done by configuring IRM settings within the SharePoint admin center, which integrates with AzureRM to apply protection settings at the document library level. By enabling IRM on SharePoint document libraries, you ensure that the files are encrypted and that only authorized users can read or edit them according to the policies you set. This is different from installing AzureRM client on user devices or setting up a firewall for SharePoint, as IRM specifically handles the protection of the documents within SharePoint through AzureRM.