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2. DVD region code - Wikipedia

   en.wikipedia.org/wiki/DVD_region_code

   However, region-free DVD players, which ignore region coding, are also commercially available, [2] and many DVD players can be modified to be region-free, allowing playback of all discs. [3] DVDs may use one code, multiple codes (multi-region), or all codes (region free).

3. List of Blu-ray player manufacturers - Wikipedia

   en.wikipedia.org/wiki/List_of_Blu-ray_player...

   Blu-ray Disc authoring; Blu-ray Disc; Blu-ray Disc Association; Blu-ray Disc recordable; Blu-ray Region Code; CBHD Based on HD DVD format. Comparison of high definition optical disc formats; Digital rights management; HD DVD; HD NVD; High definition optical disc format war; Optical disc; PlayStation 3; PlayStation 4; Xbox One

4. VCR/Blu-ray combo - Wikipedia

   en.wikipedia.org/wiki/VCR/Blu-ray_combo

   A VCR/Blu-ray combo is a multiplex or converged device, convenient for consumers who wish to use both VHS tapes and the newer high-definition Blu-ray Disc technology. [1]When Blu-ray Disc players went on the market in mid-2006, the final major Hollywood motion picture on VHS (David Cronenberg's A History of Violence) had already been released. [2]

5. Blu-ray - Wikipedia

   en.wikipedia.org/wiki/Blu-Ray

   Early 4K Blu-ray release at Best Buy. A 4K Blu-ray Disc player was also released. On January 7, 2013, Sony announced that it would release "Mastered in 4K" Blu-ray Disc titles sourced at 4K and encoded at 1080p. [77] "Mastered in 4K" Blu-ray Disc titles can be played on existing Blu-ray Disc players and have a larger color space using xvYCC.

6. Regional lockout - Wikipedia

   en.wikipedia.org/wiki/Regional_lockout

   Ultra HD Blu-ray discs are also region-free. [2] On computers, the DVD region can usually be changed five times. Windows uses three region counters: its own one, the one of the DVD drive, and the one of the player software (occasionally, the player software has no region counter of its own, but uses that of Windows).

7. Ultra HD Blu-ray - Wikipedia

   en.wikipedia.org/wiki/Ultra_HD_Blu-ray

   Ultra HD Blu-ray (4K Ultra HD, UHD-BD, or 4K Blu-ray) [2] [3] is a digital optical disc data storage format that is an enhanced variant of Blu-ray. [4] Ultra HD Blu-ray supports 4K UHD (3840 × 2160 pixel resolution) video at frame rates up to 60 progressive frames per second, [ 4 ] encoded using High-Efficiency Video Coding . [ 4 ]