iPhone or other mobile device will no longer violate a controversial federal copyright law called the Digital Millennium Copyright Act, or DMCA. Bypassing a manufacturer's protection mechanisms to allow "handsets to execute software applications" is now permitted.

But in practice, the actual impact of that portion of the decision may be limited.

Apple says that jailbreaking your iPhone, while now as legal as can be, will still void your warranty. Besides, said Apple, the number of people who actually go to the trouble of jailbreaking their iPhone is so small that it’s really not worth getting too excited over.