California's Digital Age Assurance Act: Implications for Operating Systems

California's Digital Age Assurance Act, officially known as Assembly Bill No. 1043, mandates that all operating system providers implement age verification during account setup. Signed by Governor Gavin Newsom in October 2025, the law will take effect on January 1, 2027. It encompasses a wide range of operating systems, including Windows, macOS, Android, iOS, Linux distributions, and Valve's SteamOS. The legislation aims to protect younger users by requiring OS providers to collect age information and categorize users into four age brackets: under 13, 13 to under 16, 16 to under 18, and 18 and older.

California to Introduces Age Verification Law for All Operating SystemsCalifornia's Digital Age Assurance Act forces OS age checksDiggCalifornia introduces age verification law for all operating systems, including Linux and SteamOS — user age verified during OS account setupCalifornia’s New Law Will Make Operating Systems Ask for Your Age at Account SetupA new California law says all operating systems, including Linux, need to have some form of age verification at account setup

Under AB 1043, operating system providers must create an accessible interface for users to input their birth date or age. This information will be transmitted to application developers via a real-time application programming interface (API). Developers who receive this age signal will be deemed to have actual knowledge of the user’s age, shifting the legal responsibility for ensuring age-appropriate content onto them. Non-compliance could result in penalties of up to $7,500 per affected child for intentional violations.

California to Introduces Age Verification Law for All Operating Systems

While the law does not mandate invasive verification methods like facial recognition or ID uploads, it has raised concerns, particularly among smaller Linux communities. Many Linux distributions are maintained by volunteers and lack the infrastructure to implement the required API consistently. Critics argue that enforcing this law on such platforms may be impractical. For instance, a user on the Linuxmint subreddit stated, "This is basically impossible for California to enforce," suggesting that smaller distros might simply add disclaimers indicating they are not intended for use in California.

California's Digital Age Assurance Act forces OS age checks

Governor Gavin Newsom, despite signing the bill, has expressed reservations about its implementation. He noted the need for potential amendments to address complexities such as multi-user accounts and user profiles across devices. Assemblymember Buffy Wicks, who authored the bill, emphasized that the legislation aims to avoid constitutional concerns by focusing solely on age assurance rather than content moderation.

Digg

The law has faced criticism from privacy advocates who warn that it could normalize user tracking and lead to more stringent verification measures in the future. Additionally, concerns have been raised about the broader implications of mandatory age verification, as seen in similar laws in the UK and Australia, which have also faced backlash for privacy issues.

A new California law says all operating systems, including Linux, need to have some form of age verification at account setup

As the law approaches its effective date, discussions around potential amendments and the feasibility of enforcement for various operating systems, particularly Linux distributions, will likely continue. The outcome of these discussions may significantly impact how age verification is implemented across different platforms.

California's Digital Age Assurance Act forces OS age checks

• “This is basically impossible for California to enforce,” — CatoDomine, Linuxmint subreddit user

California's Digital Age Assurance Act forces OS age checks

• “complexities such as multi-user accounts shared within families and user profiles spread across multiple devices” — Governor Gavin Newsom

California to Introduces Age Verification Law for All Operating Systems

• “avoids constitutional concerns by focusing strictly on age assurance, not content moderation,” — Assemblymember Buffy Wicks

California introduces age verification law for all operating systems, including Linux and SteamOS — user age verified during OS account setup

The Digital Age Assurance Act represents a significant shift in how operating systems will handle user data, particularly regarding age verification, and its implementation will be closely monitored as the deadline approaches.

California's Digital Age Assurance Act forces OS age checks