Three exemptions to the Digital Millennium Copyright Act was granted thanks to the Electronic Frontier Foundation (EFF).
The most critical of the rulings as it relates to mobile devices is the one that says jailbreaking or rooting your mobile phone to run apps from any source is now legal. This does not prevent manufactures or carriers from implementing technology like eFuse to protect against jailbreaking. The ruling also does not cover the distribution of tool to jailbreak/root devices. It really just says they cannot sue you if you bypass the restrictions.