California’s legislature passes an age-verification bill, Assembly Bill 1856, including an exemption for open-source operating systems. The measure now moves to the final legislative step before it can be presented to Governor Gavin Newsom, after clearing both chambers.

The bill is set to take effect on January 1, 2027. For operating systems that are covered, it would require an interface during account setup that asks for a user’s birth date and/or age of the device’s primary user. The operating system must then provide an age “signal” through an API intended for covered application stores and developers. The signal categorizes users into four ranges: under 13, 13–15, 16–17, and 18 and older.

Outlet accounts emphasize the same key change: open-source operating systems remain carved out, meaning they are not required to implement the age-verification steps described above. Other reporting notes that major closed-source platforms such as Windows, macOS, iOS, and Android are still expected to be subject to the requirements if they fall within the bill’s coverage. Final enactment depends on the governor’s signature.