All HDMI 2.1 compliant cables must have an affixed Ultra High Speed HDMI Certification Label on their packaging, including the “Ultra High Speed HDMI Cable” name and logo. Labels can be scanned for authenticity using the HDMI Cable Certification app from your device’s app store.
Additionally, the cable name must be printed directly on the protective cable jacket itself to signal the cable has been tested and certified to the HDMI 2.1 standard.