VPP license transfer Is there any way to transfer licenses bought through Apple's VPP from one iDevice to another? (aka. I don't want to make apps a gift to the employee)

And what are the prerequisites if such a thing was possible?

Any source where I can easily figure that one out?
Edit: I almost forgot, we don't have a BYOD-Program, so the iDevices are institutional property.
it looks like I haven't been the only one wondering about "owning" the license to an app and being able to reassign it.


  App Store license management.
  
  The App Store Volume Purchase Program now offers businesses the ability to assign apps to their users while keeping full ownership and control over app licenses. Companies purchase app licenses through the VPP website, and can use their MDM solution to assign apps to employees over the air. [...] Apps can be revoked at any time and reassigned to other employees. [...]


http://www.apple.com/ios/ios7/business/