California's legislature passes a bill exempting open-source OSes like Linux from a 2025 age-verification law; Windows, macOS, iOS, and Android remain in scope
California had already expanded its youth-online-safety agenda in 2022, then signed AB 1043 in 2025, placing age-verification duties on device makers and app stores. AB 1856 draws a new boundary inside that framework: open-source operating systems are treated differently from the commercial platforms still covered.
The distinction matters because the 2025 law centers compliance on platform operators. The Legislature’s passage of AB 1856 makes the operating system’s governance model—not merely the device or app store—a determinant of age-assurance exposure.
Device makers and app stores serving the covered proprietary platforms retain the age-verification obligations established under AB 1043.
Second-order effects
Platform operators must manage a split compliance environment in which age-assurance duties attach to commercial operating-system ecosystems but not to open-source OSes.
The exemption makes the legal definition and governance of an operating system a practical compliance question for software distributors and device builders.
Third-order effects
If the carve-out is preserved, California’s approach would establish operating-system governance as a durable line in platform regulation, rather than treating all software environments alike.
The measure points to a broader contest over whether obligations designed for centralized gatekeepers can be applied to decentralized open-source projects without a comparable operator.
The trend: Age-assurance regulation is becoming more targeted at centralized platform gatekeepers, with open-source governance emerging as a key boundary of liability.
California's bill which would exempt Open Source Operating Systems from the state's mandatory Age Attestation law... has passed both houses and is now being sent to the California Governor's desk to be signed into law. The key new language:
California just carved Linux out of its age-check law. AB 1856 passed both houses with zero no votes. If Newsom signs it, Fedora, Debian, Ubuntu, Arch and other GPL/MIT/BSD/Apache systems skip the Jan 2027 “how old are you?
Good news for Californians. The legislature voted unanimously: Linux will not have to ask for your age. AB 1856 passed the Senate 39-0, then the Assembly concurred. Operating systems and apps distributed under GPL, MIT, BSD, or Apache are out of California's age-verification
@tomshardware Russian government has tried to ban a bunch of internet resources because of the war with Ukraine, and now approximately 40% of the population use VPN daily. There is a lesson in there.
CaIifornia Lawmakers unanimously pass Linux exemption from age-verification law — software distributed under the GPL, MIT, BSD, and Apache licenses are exempt
California lawmakers unanimously pass Linux exemption from age-verification law — software distributed under the GPL, MIT, BSD, and Apache licenses are exempt
California lawmakers unanimously pass Linux exemption from age-verification law — software distributed under the GPL, MIT, BSD, and Apache licenses are exempt
Win! California lawmakers unanimously pass Linux exemption from age-verification law — software distributed under the GPL, MIT, BSD, and Apache licenses are exempt
Win! California lawmakers unanimously pass Linux exemption from age-verification law — software distributed under the GPL, MIT, BSD, and Apache licenses are exempt