Yes, there is at least one third party patent license administrator for JPEG-XT: https://www.sisvel.com/licensing-programs/digital-video-display-technology/jpe

Yes, there is at least one third party patent license administrator for JPEG-XT: https://www.sisvel.com/licensing-programs/digital-video-display-technology/jpeg-xt/patent-owners https://www.sisvel.com/licensing-programs/digital-video-disp...