A Microsoft Rights Management sharing app has been released for the iPhone, iPad, and iPod touch. You need to have RMS for individuals or an RMS enabled Office 365 account to use the new application.
You can register at https://portal.aadrm.com.
RMS sharing app enables you to securely collaborate with others. You can view protected files that others have shared with you. You can also take pictures or choose one from your camera roll, protect and share them with your coworkers and friends.
RMS sharing app lets you breathe easy knowing your files are safe and can only be opened by users you trust and share with.
More details can be found here: http://technet.microsoft.com/en-us/dn451248.
You can download Microsoft Rights Management sharing from the App Store for free.