CD: AAD ADD - UHD: up/down scale

[kfbkfb]

Soon after the CD was introduced the SPARS CODE
https://en.wikipedia.org/wiki/SPARS_code
was created to provide more information about the
source and mixing method used for the CD.

I think it would be helpful to provide similar information
about UHD Blu-ray discs, specifically, was the UHD
content produced using upscaling and/or downscaling
of the source material.

(maybe the content produces don't want to reveal
that a UHD Blu-ray disc used upscaled content)

Kirk Bayne