This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The MediaKeyMessageEvent interface of the EncryptedMediaExtensions API contains the content and related data when the content decryption module generates a message for the session.


Creates a new instance of MediaKeyMessageEvent.


Inherits properties from its parent, Event.

MediaKeyMessageEvent.message Read only
Returns an ArrayBuffer with a message from the content decryption module. Messages vary by key system.
MediaKeyMessageEvent.messageType Read only
Indicates the type of message. May be one of license-requestlicense-renewallicense-renewal, or individualization-request.


Inherits methods from its parent, Event.


// TBD


Specification Status Comment
Encrypted Media Extensions
The definition of 'MediaKeyMessageEvent' in that specification.
Recommendation Initial definition.

Browser compatibility

Feature Chrome Edge Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support 42.0 (Yes) ? ? ? ?
Feature Android Android Webview Edge Firefox Mobile (Gecko) Firefox OS IE Mobile Opera Mobile Safari Mobile Chrome for Android
Basic support No support 43.0 (Yes) ? ? ? ? ? 42.0

Document Tags and Contributors

 Contributors to this page: jpmedley, libbymc, Sebastianz, grillllii, kscarfone
 Last updated by: jpmedley,