Mobile phone jailbreaking has been now legalized in the United States according to the new DCMA legislations on mobile software use. This makes it no longer illegal under the DMCA to jailbreak your iPhone 4.
Federal regulators lifted a cloud of uncertainty when they announced it was lawful to manipulate or jailbreak any mobile device , which includes Iphone unlike any cellular device . That make it officially legal for all iphone owners to “jailbreak” their device and run any application of their want.
“Jailbreak” is a term given to the processes involved to circumvent the digital rights management (DRM) technology running on Apple iphone.
Actual text from the DCMA legislation :