Based on my research, “rim4k full” does not appear to correspond to a known product, software, standard, technical specification, or established brand. It may be a misspelling, a very niche term, or something recently coined without widespread documentation.
4K is a resolution, not a quality metric. Two cameras can both say "4K," but one records at 20 Mbps (trash) and one records at 80 Mbps (Rim4K Full). Always check the bitrate in the file properties. rim4k full