Published onAugust 11, 2025IAB Content Taxonomy 2.0 → 2.1: SCD Extension — Migration Notesiabiab-taxonomyprivacycontent-taxonomyadtechWhat changed between IAB Content Taxonomy 2.0 and 2.1: no categories were added or removed, but many nodes gained the new SCD (Special Category Data) extension and what that means for data handling in the supply chain.