Apple Music Offline Files Have no URL?

Question

It seems that the property MPMediaItemPropertyAssetURL on a MPMediaItem returns null when the file is one that was from Apple Music and has been made \

Answer 1

It seems that Apple Music files are DRM-protected and subscription based, so probably Apple prohibits the use of references to these assets due to rights management.

Reference: https://forums.developer.apple.com/thread/7389