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# streamingContentKeyRequestData(forApp:contentIdentifier:options:)

Obtains key request data for a specific combination of application and content.

```
func streamingContentKeyRequestData(forApp appIdentifier: Data, contentIdentifier: Data, options: [String : Any]? = nil) throws -> Data
```

## Parameters

`appIdentifier`

An opaque content identifier for the application. The value of this identifier depends on the particular system used to provide the decryption key.

`contentIdentifier`

An opaque identifier for the content. The value of this identifier depends on the particular system used to provide the decryption key.

`options`

Additional information necessary to obtain the key, or `nil` if no additional information is required.

## Return Value

The key request data that must be transmitted to the key vendor to obtain the content key.

## Topics

### Configuration options

[`AVAssetResourceLoadingRequestStreamingContentKeyRequestRequiresPersistentKey`](/documentation/AVFoundation/AVAssetResourceLoadingRequestStreamingContentKeyRequestRequiresPersistentKey)

Specifies whether the content key request requires a persistable key to be returned from the key vendor.


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