https://wccftech.com/watchos-7-will-support-audio-streaming-with-fairplay-drm/

watchOS 7 will bring support FairPlay DRM audio streaming for third-party apps. This will allow apps to streaming protected HLS content using encryption keys.

FairPlay had been available on iOS, macOS and tvOS for a long time, and Apple is finally brining it to Apple Watch via watchOS 7. This will open up the Apple Watch to more competing audio streaming services.