---
title: MediaKeySystemAccess.keySystem
slug: Web/API/MediaKeySystemAccess/keySystem
tags:
  - API
  - EncryptedMediaExtensions
  - Experimental
  - MediaKeySystemAccess
  - NeedsExample
  - Property
  - Reference
  - keySystem
browser-compat: api.MediaKeySystemAccess.keySystem
---
{{APIRef("EncryptedMediaExtensions")}}{{SeeCompatTable}}

The `MediaKeySystemAccess.keySystem` read-only property returns a
{{domxref('DOMString')}} identifying the key system being used.

## Syntax

```js
var keySystem = mediaKeySystemAccess.keySystem;
```

## Specifications

{{Specifications}}

## Browser compatibility

{{Compat}}
