Safend is one company that was early in focusing on port control and has since branched out into other areas of so-called Data Leak Prevention (DLP).

FORBES: Why port control matters

While Data Leak Prevention attempts to provide an overlay of classification, network monitoring, and end point management (for USB devices), there is another approach that uses advanced agents on the desktop that continuously check for abnormal behavior that is indicative of root kits and custom Trojans.

FORBES: Bottom Line: Assume That You've Been Hacked

And inside the container the user is able to share data between business apps (e.g. copy and paste text from an email into a CRM record), but corporate IT would of course not want data inside the container copy-and-pasted onto a non-container app such as Twitter or Facebook i.e. data leak prevention.

FORBES: Connect