I knew it was a matter of time before they would do something.
Apple has applied for a patent, titled "Systems and Methods for Identifying Unauthorized Users of an Electronic Device," that covers a series of security measures to automatically protect devices from thieves and other "unauthorized users." Unauthorized users apparently applies to those who engage in jailbreaking, which allows devices to run apps not approved by the company producing the operating system--such as Apple, the main target of such bypasses.
http://news.cnet.com/8301-13579_3-20014356-37.html