CA AB2355

Requires committees that create, publish, or distribute political advertisements containing AI-generated or substantially altered images, audio, or video to include the disclosure "Ad generated or substantially altered using artificial intelligence" in a clear and conspicuous manner.

Specifies disclosure formatting requirements depending on advertisement medium: radio/telephone (spoken at beginning or end, 3+ seconds), video (written display for 5-10 seconds with specific sizing), print (10-point minimum font), and electronic media (varies by platform with hyperlink options).

Defines "generated or substantially altered using artificial intelligence" to mean content entirely created by AI that falsely appears authentic to a reasonable person, or materially altered by AI causing a reasonable person to have a fundamentally different understanding compared to the unaltered version.

Authorizes the Fair Political Practices Commission to enforce violations through injunctive relief or administrative/civil remedies available under existing law, and specifies that violations do not constitute misdemeanors.

Exempts immaterial alterations such as cosmetic adjustments, color edits, cropped images, or resized images from disclosure requirements.