Apple Insider posted a story that Apple has reportedly begun closing the accounts of some developers who have inappropriately sold their account device slots, allowing them to profit from the installation iOS 5 on unauthorized non-developer iPhones and iPads.

Some developers who sold their slots for UDIDs, the unique identification numbers associated with every iOS device, have been tracked down by Apple, according to KarthikK.net. Apple has reportedly sent e-mail warnings to developers, notifying them that their illicit activities have been discovered.

In addition, Apple is said to have begun closing developer accounts for some who have been identified as selling their device slots. Apple has also reportedly flagged UDIDs associated with a developer account found in violation, making the device running iOS 5 "unusable."

  Apple cracking down on non-developer devices running iOS 5 - report