The US Copyright Office reviews the Digital Millennium Copyright Act every three years, looking at requests to create temporary changes that act as ersatz loopholes int he law, typically to address continually changing technology standards. This year, the Copyright Office allows jailbreaking of devices like the iPhone, but not for devices like the iPad.
The Office also ruled that consumers can unlock phones purchased before January 2013, but not thereafter. You’ll also be albe to bypass encryption on a DVD to use an excerpt in a non-commercial way, like in a documentary, but it will still be illegal to rip a DVD for your iPad.
The rules seem pretty arbitrary, right?