Privacy and Technology

The ACLU of Northern California defends the right to privacy guaranteed by the California Constitution and fights for social justice in the digital age. We work to stop dangerous government surveillance, eliminate bias in artificial intelligence and other emerging technologies, and restrict the online collection and use of our personal data.

Outline of the state of California with a man in a suit holding a sign that says "Defend Against Surveillance" and a camera

The Latest

Press Release
A finger presses a button on a digital door lock

ACLU Sues San Francisco Landlords over AI-Powered Surveillance in Tenants' Homes

Issue Areas: Privacy and Technology
Press Release
Graphic of Automatic license plate readers

Lawsuit Challenges San Jose’s Warrantless ALPR Mass Surveillance

EFF and the ACLU of Northern California Sue on Behalf of Local Nonprofits
News & Commentary
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Mass Surveillance in the Trump Era

The Trump administration is weaponizing technology to build a mass-surveillance state.
Know Your Rights
Iphone taking photo

Know Your Rights: Taking Video or Photos of Law Enforcement

Taking photographs of things that are plainly visible from public spaces is a constitutional right – and that includes federal buildings, transportation facilities, and police and other government officials carrying out their duties. Unfortunately, there is a widespread, continuing pattern of law enforcement officers ordering people to stop taking photographs from public places, and harassing, detaining, and arresting those who fail to comply.
Court Case
Jan 20, 2026

SIREN, et al. v. City of San Jose, et al.

The ACLU of Northern California and the Electronic Frontier Foundation filed suit in Santa Clara County Superior Court against the City of San Jose and others to challenge San Jose police officers’ practice of searching for location information collected by automated license plate readers (ALPRs) without first getting a warrant.
Court Case
Jan 21, 2026

San Francisco Tenants Union, et al. v. Smart Rent, et al.

The ACLU filed a lawsuit in San Francisco Superior Court today to protect tenants' privacy rights from landlords who force renters to allow AI-powered surveillance technology in their homes
Court Case
Dec 09, 2025

J. Doe v. United States Department of Homeland Security

We filed a motion in federal court to prevent Meta from complying with the Department of Homeland Security’s demand that the tech giant turn over the name, email address, and phone number associated with an Instagram account that reposted a video naming a Border Patrol agent. We argue that the government’s administrative subpoena violated First Amendment protections for anonymous political speech.
Court Case
Jan 21, 2026

Schmitz, et al. v. Permit Sonoma, et al.

The ACLU Foundation of Northern California has filed a lawsuit to block Sonoma County code inspectors from using drones to conduct surveillance of people's homes without a warrant.