The 3-0 decision by the U.S. Court of Appeals for the District of Columbia Circuit guts much of a 2010 Federal Communications Commission order, in a challenge brought by Verizon. The nation’s number one mobile provider successfully argued that the regulatory agency overstepped its authority because it issued the rules in 2010 without classifying broadband providers as common carriers, like rank-and-file telcos.

While it’s a nuanced legal argument, the effects are huge.

Here’s the rules that were negated:

*Wireline or fixed broadband providers may not block lawful content, applications, services, or non-harmful devices. Mobile broadband providers may not block lawful websites, or block applications that compete with their voice or video telephony services.