I recently completed a video on TechNet Edge that shows how you can use XPS to protect and restrict permission to documents. Here is the description:

Do you work in an organization that uses Active Directory – Rights Management Services to protect and restrict permission to files? Have you ever wanted to restrict permission to a file from an application that isn’t built to work with AD RMS? Using the XPS Viewer, you can protect and share a fixed-format (readable) version of almost any file type. In this video, we show you how you can use AD RMS and the XPS Viewer to protect and share files.