The RMS Sharing Application is now generally available (As of November 19th)! still in preview as of this writing but you can evaluate it now. It is expected to be released in Q4 2013.  It allows you to share any file on any computer or mobile device.

This blog article walks you through the easy steps to get started with RMS Application Sharing.

Step 1 – Browse to https://portal.aadrm.com

After signing in with your existing Office 365 tenant username and password, you can then select the setup program to download based on the device type you want to install this application on.

For this blog, I clicked on the Windows icon.

This downloads a 50 MB zip file named “Microsoft Rights Management sharing application x64.zip”
Simply unzip and run setup.exe, and step through a 1 step setup program to configure RMS Application Sharing.

You must restart your computer after the installation before you can begin protecting content.

The installation installs four components into Programs and Features.

After a restart, you can now right-click on any file on your computer and either protect it in-place, or you can immediately share it with anyone [with a business email account].  Currently you can only share files with a business email account. Consumer email accounts should be available soon.
http://technet.microsoft.com/en-us/dn467883

For example, you can right-click on a PDF file and select ‘Share Protected’ from my Windows Explorer context window.

This brings up the common API for Application Sharing that will be consistent on any computer or mobile device since it all connects through the same SDK.

It then creates an email message with the file name appended with a .pfile extension.

If you send a file that is not able to be opened with an application that is RMS aware, then the notification that the recipient receives is that they are essentially under the honor system. For example, Adobe Reader doesn’t have the ability to manage the rights that the sender of the file is requesting.

So it seems that the potential of the new RMS capability is limited by the applications vendors that embrace and adopt the new RMS SDK. Right now that would be Microsoft Office 2010, 2013 and Foxit PDF Reader. The Foxit RMS Plug-in to the Foxit Enterprise Reader requires a paid license to integrate Foxit Enterprise Reader with AD RMS.
http://officepreview.microsoft.com/en-us/sharepoint-help/sharepoint-compatible-pdf-readers-that-support-microsoft-information-rights-management-services-HA102925502.aspx

Reference:

http://blogs.technet.com/b/rms/archive/2013/08/29/the-new-microsoft-rms-is-live-in-preview.aspx

Microsoft Information Protection Viewer User’s Guide
http://go.microsoft.com/fwlink/?LinkId=302325

Microsoft Information Protection Viewer Administrator’s Guide http://go.microsoft.com/fwlink/?LinkId=302329

http://www.foxitsoftware.com/landingpage/2012/07/Reader-Ads-RMS/?action=success&language=en-us