---
title: identifier
framework: avfoundation
role: symbol
role_heading: Instance Property
path: avfoundation/avcontentkeyspecifier/identifier
---

# identifier

The container and protocol-specific key identifier.

## Declaration

```swift
var identifier: any Sendable { get }
```

## See Also

### Inspecting a specifier

- [keySystem](avfoundation/avcontentkeyspecifier/keysystem.md)
- [options](avfoundation/avcontentkeyspecifier/options.md)