California is the standard bearer for net neutrality laws, but a nonprofit group of broadband providers is now challenging Maine's so-called Web Freedom Act in court.

The legislation, which took effect last October, prevents broadband providers from striking exclusivity deals that restrict customers from accessing certain websites. It also bans internet providers from sharing customers' browsing data without the explicit approval of their personal information.

The trial was scheduled to start Monday in Portland, Maine, but Comcast challenged the law before it went into effect. After the courts said in October that it wouldn't be able to enforce the law, the bill's supporters revised the statute and sent it back to the legislature in November. This time, they claim that the state can enforce the new law without Comcast's interference.

This is the first case to challenge net neutrality nationwide since the FCC won approval to roll back Obama-era regulations, said Jacob Leibenluft, a Portland lawyer representing Maine's privacy law.

"They have all got this in their back pocket in case they can get this overturned," Leibenluft said, referring to Internet service providers.