Apple sells ALAC files for some of their Atmos encoded music and include the Atmos mix data in the ALAC file (if you can figure out how to buy rather than stream, there are some interesting dark patterns in Apple Music/iTunes Store today promoting streaming over ownership). The majority of ALAC files downloaded from Apple are alleged to be DRM-free, as well.
(I have never figured out how to get iTunes Store to correctly tell me if a download will be DRM-free or not. I'd probably love pointers on how to do that, because I would probably buy more music from Apple if I was less afraid of accidental DRM, which has been the case too many times for me.)
ALAC is an open-source codec supported by a number of decoders today and isn't necessarily just trapped in Apple's walled garden. (I've heard some reports that ALAC Atmos decoding/playback can even sometimes be better in non-Apple software.)
(I have never figured out how to get iTunes Store to correctly tell me if a download will be DRM-free or not. I'd probably love pointers on how to do that, because I would probably buy more music from Apple if I was less afraid of accidental DRM, which has been the case too many times for me.)
ALAC is an open-source codec supported by a number of decoders today and isn't necessarily just trapped in Apple's walled garden. (I've heard some reports that ALAC Atmos decoding/playback can even sometimes be better in non-Apple software.)