Summary on IRM with Office Web Apps 2013
When it comes to IRM protected Office document libraries in SharePoint 2013, Office Web Apps 2013 offers read-only capability. Office Web Apps relies on the document host system (i.e. SharePoint) to handle communication with Rights Management servers since it has no means to directly communicate with Rights Management Server. IRM protection precludes Office Web Apps from allowing editing of IRM protected documents. Documents that have any IRM permissions modification or protection added from the client application (i.e. Word, PowerPoint, Excel) and stored on a document management system cannot be opened by Office Web Apps. This is also true with IRM protected documents stored on Windows Live, Facebook or other 3rd Party hosts systems.
Office Web Apps does not support the following features normally offered for non-IRM protected documents. These features are currently suppressed from the user interface:
- Edit in browser
- Copy selection
- Add comments
No word on when or if these features will be available for IRM protected libraries in an upcoming release.