tl;dr: California's AB 2047 has passed the State Assembly, mandating surveillance software on 3D printers to prevent unlicensed firearm manufacturing—a practice EFF argues is rare and already illegal. Recent amendments weakened performance standards (from "effectively preventing" circumvention to "substantially reducing" it), carved out exceptions for major entertainment studios but not indie creators, and offloaded standards-setting to non-governmental third parties. EFF warns the bill still threatens privacy, chills open source development, and risks IP leaks via surveilled print files, while being trivially circumventable by determined bad actors.