public function getAssetDeliveryPolicy($assetDeliveryPolicy)
    {
        $assetDeliveryPolicyId = Utilities::getEntityId(
            $assetDeliveryPolicy,
            'WindowsAzure\MediaServices\Models\ContentKeyAuthorizationPolicy'
        );

        return AssetDeliveryPolicy::createFromOptions($this->_getEntity("AssetDeliveryPolicies('{$assetDeliveryPolicyId}')"));
    }