What it is
IPTC and the PLUS Coalition have added machine-readable data-mining permission fields to major image and video metadata standards so rights holders can say whether works may be used in training datasets. This belongs in the catalog because it pushes AI-use controls down to the asset level, which is complementary to site-level approaches like robots.txt or domain-level preference headers.
Watchouts
Asset-level metadata only works when intermediaries preserve it, and public adoption is harder to measure than crawler-level signals.
Evidence trail
Examples
ExifTool write command Source
IPTC shows this command as a concrete way to attach a PLUS Data Mining value to a video file.
exiftool -XMP-plus:DataMining="Prohibited for Generative AI/ML training" example-video.mp4 Embedded metadata field Source
The same IPTC guidance uses this Data Mining value for a generative-AI opt-out.
XMP-plus:DataMining = "Prohibited for Generative AI/ML training"