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# AVContentKeyRequestProtocolVersionsKey

A key that specifies the versions of the content protection protocol supported by the application.

```
let AVContentKeyRequestProtocolVersionsKey: String
```

## Discussion

The contents of this key are an <doc://com.apple.documentation/documentation/Foundation/NSArray> or one or more <doc://com.apple.documentation/documentation/Foundation/NSNumber> objects.

---

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