Azure Rights Management

Azure Rights Management (often abbreviated to Azure RMS) is the protection technology used by Azure Information Protection.
This cloud-based protection service uses encryption, identity, and authorization policies to help secure your files and email, and it works across multiple devices—phones, tablets, and PCs. Information can be protected both within your organization and outside your organization because that protection remains with the data, even when it leaves your organization’s boundaries.
As an example, employees might email a document to a partner company, or save a document to their cloud drive. The persistent protection that Azure RMS provides not only helps to secure your company data, but might also be legally mandated for compliance, legal discovery requirements, or simply for good information management practices.
But importantly, authorized people and services (such as search and indexing) can continue to read and inspect the protected data. This capability is not easily accomplished with other information protection solutions that use peer-to-peer encryption. You might have heard this capability referred to as "reasoning over data" and it is a crucial element in maintaining control of your organization’s data.
The following picture shows how this service offers a protection solution for Office 365, as well as for on-premises servers and services. You also see that protection is supported by the popular end-user devices that run Windows, macOS, iOS, and Android.
You can use this protection with Office 365 subscriptions as well as with subscriptions for Azure Information Protection. You can find more information about the available subscriptions and which features they support on the Azure Information Protection site.
https://azure.microsoft.com/pricing/details/information-protection/

Protect multiple file types

In early implementations of Rights Management, only Office files could be protected, using native Rights Management protection. Now, generic protection that was first offered by the Rights Management sharing application and now by the Azure Information Protection client means that more file types are supported.