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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. 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]

4. 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

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

   For bypassing region codes, there are software and multi-regional players available. A new form of Blu-ray region coding tests not only the region of the player/player software, but also its country code, repurposing a user setting intended for localization (PSR19) as a new form of regional lockout. This means, for example, while both the US ...

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 ]