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# identifier

The identifier for the content key.

```
var identifier: (any Sendable)? { get }
```

## Discussion

This property is specific to the container and the protocol. To use the key with an HTTP Live Streaming [`AVURLAsset`](/documentation/AVFoundation/AVURLAsset), the identifier must be an <doc://com.apple.documentation/documentation/Foundation/NSURL> that matches a key `URI` in the media playlist.

---

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