Remote Key Provisioning - a feature that's mandatory for Android 13 devices - may soon support remote Widevine DRM provisioning, according to this patch: android-review.googlesource.com/c/platform/pac
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I can't count the number of times I've heard of Widevine DRM issues on Android devices, with many suddenly reporting a downgrade to L3 randomly or after an update. There have been cases where the keys were wiped entirely and had to be sent to the OEM for re-provisioning.
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Remote provisioning doesn't replace the reliance on unique or batch keys provisioned at the factory. It uses them to bootstrap provisioning short lived keys remotely.