Registered brand name definition alters GST treatment for branded goods, linking classification to brand registration and Annexure I conditions. Amendment revises Schedule entries to substitute, omit and insert HS-heading-based serial numbers and commodity descriptions, differentiating goods 'fresh or chilled' from 'other than fresh or chilled' and treating branded, non-unit container goods that either bear a registered brand name or a brand with an actionable/enforceable right as subject to conditions in Annexure I; it also amends the Explanation to define 'registered brand name' to include brands registered on or after the specified registration cutoff under trademark, copyright or foreign laws and declares the amendments to have retrospective effect from the stated effective date.