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IRM is not supported for SharePoint lists and libraries in national cloud deployments. The Azure Rights Management service (Azure RMS) from Azure Information Protection, and the on-premises equivalent, Active Directory Rights Management Services (AD RMS), support Information Rights Management for sites.
You must use a work or school account that has global administrator privileges to enable the Rights Management service. Otherwise, you won’t be able to use IRM features with SharePoint Online. After activating the Rights Management service, sign in to the SharePoint admin center to turn on IRM.
When do I enable rights management in SharePoint?
When IRM is enabled for a library, rights management applies to all of the files in that library. When you enable IRM for a list, rights management applies only to files that are attached to list items, not the actual list items.
How to apply information rights management ( IRM ) to a list?
When you enable IRM for a list or library in SharePoint Server 2013, you can only protect file types in that list or library for which a protector is installed on all front-end web servers. A protector is a program that controls the encryption and decryption of rights-managed files of a specific file format.
A user can print only if the Allow users to print documents checkbox is selected on the Information Rights Management Settings page for the library. Hence, in this article, we have learned the below topics with respect to Information Rights Management (IRM) in SharePoint Online:
How to prevent people from uploading documents that do not support IRM?
Prevent people from uploading documents that do not support IRM to this list or library. If you select this option, people will not be able to upload any of the following file types: File types that do not have corresponding IRM protectors installed on all of the front-end web servers.