To understand a "4K Remux Repack," you have to break down each component: 4K (Ultra HD): Refers to the resolution ( ) and usually implies the inclusion of (High Dynamic Range) like HDR10, HDR10+, or Dolby Vision.
refer to specific types of video releases aimed at preserving quality or correcting technical errors. 4K Blu-ray Remux bluray remux 4k repack