Android Jelly Bean has new developer feature called "verify apps over usb". Can anyone tell me what exactly does it do?
Verify apps over usb — Allows you to disable app checks for sideloading apps over USB, while still checking apps from other sources like the browser. This can speed up the development process while keeping the security feature enabled.
Reference:
http://developer.android.com/about/versions/jelly-bean.html
It means during installation the code is verified against Googles servers if there is known malware in the app.
More in this blog at Computerworld, Inside Android 4.2's powerful new security system