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# OSBundleUsageDescription

A message that tells people why the app is trying to install a driver extension bundle.

## Discussion

This key is required for all <doc://com.apple.documentation/documentation/DriverKit> extensions. Failure to include this key results in an error at activation time. For system extensions that are not DriverKit extensions, use [`NSSystemExtensionUsageDescription`](/documentation/BundleResources/Information-Property-List/NSSystemExtensionUsageDescription) instead.

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