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You may wish to consult the article "4K Ultra Blu-Ray Players and Disks - What You Need To Know" on the Lifewire web site (www.lifewire.com). The article points out there is a difference between between a 4K Ultra HD Blu-Ray player and a Blu-Ray Disc player that upscales to 4K. While older Blu-ray Discs can be played on 4K Blu-ray players, the reverse is not the case; 4K Blu-ray Discs cannot be read by older standard Blu-ray Disc players. The article goes on to provide some technical information as to why this is the case.
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