Less Drm support

[jasi381]

So less or no sample for porper DRM conetnt downloading using exoplayer so much confused with the less documention of the developer website and very less sample app

[tonihei]

Did you have a look at https://developer.android.com/guide/topics/media/exoplayer/downloading-media for downloading documentation?

For DRM specifically, there is also this class: https://developer.android.com/reference/androidx/media3/exoplayer/drm/OfflineLicenseHelper

And some notes here: https://developer.android.com/guide/topics/media/exoplayer/drm#offline-keys

But I agree that it's not very well documented. Assigning to @icbaker as a documentation candidate to add more details on how offline DRM is supposed to be handled.