Dolby Vision is a format of that metadata - it's hiding either at the beginning or as part of a frames in proprietary metadata extensions. When the video is bei

Dolby Vision is a format of that metadata - it's hiding either at the beginning or as part of a frames in proprietary metadata extensions. When the video is being played, this metadata is extracted by video decoder (or demuxer) and then sent together with video frames to the display where the display then applies the (color, etc.) metadata to correctly show the frames based on its capabilities. Since the format of this metadata is proprietary, the demuxers, decoders and displays need to understand it and properly apply it when rendering. That's the part that needs to be implemented and paid for. But that's really not all of the technology - Dolby Vision isn't just the metadata format, it's also definition of how the videos are mastered and under which limitations (e.g. DV allows video to be stored in 12-bit per pixel format, allows mastering with up to 10.000 nits of brightness for white pixels and defines wider color range so better, brighter colors can be displayed by a panel capable of doing that). https://www.elecard.com/page/article_hdr https://www.elecard.com/page/article_hdr is actually a pretty good article that overviews this topic (although you do need a basic understading how digital video encoding works).