What labels does China require on AI-generated content?

Write an implicit label into the file's metadata: a field named AIGC with seven keys (the label value, your name or code as producer, your content number, and the reserved and distributor keys), as Annex E of GB 45438-2025 fixes. A C2PA manifest does not replace it, and it must be written before any manifest is signed. Watermarks are encouraged, not required.

“production element information such as the attribute of the generated content, the service provider's name or code, and a content number”

Not confirmed: Where the field goes in each file format is in TC260 practice guides we have not read. That the Measures reach only services offered to the public in mainland China is from memory.

If your generation service is offered to users in mainland China, generated text, images, audio and video carry an explicit label a person can see or hear, containing "AI" (or 人工智能) and "generated" (生成) or "synthesised" (合成). On images and video it is text at an edge or corner at least 5% of the shortest side high; audio gets a spoken notice or the Morse rhythm for "AI". Exported files keep the label unless the user asks otherwise under your agreement, and then you keep logs for six months.

“ensure the file contains an explicit label that meets the requirements”

Not confirmed: Which services must add the visible label is set by Article 17(1) of the deep synthesis provisions, which we have not re-read; the standard's Annex B lists text-to-image, music and video, cloned voices and face generation as typical. That the Measures reach only services offered to the public in mainland China is from memory.

Deleting, altering, forging or hiding an AI label is prohibited, and so is supplying tools to do it.

Your user agreement states how and in what style content is labelled, and prompts users to read the labelling requirements.