sniper_samurai
Chuunibyou
The only 4K disc I know of that's locked is the GKIDS Weathering With You disc.Any 4K UHD that is region locked (and there are a few) violates the standards set forth by the UHD Alliance. Some explanation here from Scenarist, one of the companies that makes the authoring tools for UHD:
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Technical Alert - Region Codes in Ultra HD Blu-ray Titles - SCENARIST®
Scenarist authoring systems are the world standard for creating commercial release DVDs, Blu-ray Disc and Ultra HD Blu-ray titles. >90% of releases worldwide are created using Scenarist authoring systems because they are 100% reliable and backed by our impeccable technical support.www.scenarist.com
According to the Blu-ray forums there are 30 region locked 4K discs in various markets, mainly German releases.