HDMI 2.1 Specification Sees Strong Adoption Numbers and New Announcements at CES 2019 | audioXpress
Some "HDMI 2.1" devices are actually HDMI 2.0 thanks to confusing licensing and certifications - GameRevolution
Shenzhen Euroway (SmartAVLink) Releases the World First 20 meters HDMI 2.1 UHS Active Optical Cable and Achieves the GRL Certificate - PR Newswire APAC