Ultra HD Blu-ray (marketed as 4K Ultra HD) is a digital optical disc data storage format that supersedes Blu-ray. Ultra HD Blu-ray discs are incompatible with existing standard Blu-ray players (though in most cases, a traditional Blu-ray and  digital copy has been packaged with the Ultra HD Blu-ray discs). Ultra HD Blu-ray supports  4K UHD (3840 × 2160 resolution) video at frame rates up to 60 frames per second, encoded using  High Efficiency Video Coding. The discs support both  high dynamic range by increasing the color depth to 10-bit per color and a greater color gamut than supported by conventional Blu-ray video by using the Rec. 2020 color space. It is supported on the Xbox One X,  Xbox One S, and Sony's upcoming  PlayStation 5. 
To differentiate Ultra HD Blu-ray titles on store shelves, the format uses a black opaque or slightly transparent
keep case packaging format.
The specification allows for three disc capacities, each with its own data rate: 50 GB at 82 Mbit/s, 66 GB at 108 Mbit/s, and 100 GB at 128 Mbit/s.
Ultra HD Blu-ray technology was licensed in mid 2015, and players had an expected release date of Christmas 2015.  Ultra HD Blu-ray uses a new revision of  AACS DRM, AACS 2. And AACS 2.1 on certain titles ( Stand By Me, Fury, The Patriot, Zombieland).
On May 12, 2015, the
Blu-ray Disc Association revealed completed specifications and the official Ultra HD Blu-ray logo. Unlike conventional DVDs and Blu-rays, the new 4K format does not have  region coding. 
On February 14, 2016, the BDA released Ultra HD Blu-ray with mandatory support for
HDR10 Media Profile video and optional support for Dolby Vision.  
As of January 23, 2018, the BDA spec v3.2 also includes optional support for HDR10+ and Philips/Technicolor's SL-HDR2.
The first Ultra HD Blu-ray Discs were officially released from four studios on February 14, 2016:
Sony Pictures Home Entertainment released , The Amazing Spider-Man 2 , Salt , Hancock , Chappie , and Pineapple Express . The Smurfs 2 
Lionsgate Home Entertainment released , Sicario , The Last Witch Hunter , and The Expendables 3 . Ender's Game 
Warner Home Video released , Mad Max: Fury Road , The Lego Movie , and Pan . San Andreas  20th Century Fox Home Entertainment released , The Martian , Kingsman: The Secret Service , Exodus: Gods and Kings , X-Men: Days of Future Past , Maze Runner: The Scorch Trials , The Maze Runner , Wild , Hitman: Agent 47 , and Fantastic Four . Life of Pi 
The first Ultra HD Blu-ray Discs officially released from other studios after February 14, 2016:
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