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

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support42 Yes ? ? ? ?
MediaKeyMessageEvent() constructor42 Yes ? ? ? ?
message42 Yes ? ? ? ?
messageType42 Yes ? ? ? ?
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support No42 Yes ? ? ? ?
MediaKeyMessageEvent() constructor No42 Yes ? ? ? ?
message No42 Yes ? ? ? ?
messageType No42 Yes ? ? ? ?

Document Tags and Contributors

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