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---
title: MediaKeySession
slug: Web/API/MediaKeySession
page-type: web-api-interface
browser-compat: api.MediaKeySession
---
{{APIRef("Encrypted Media Extensions")}}{{SecureContext_Header}}
The **`MediaKeySession`** interface of the [Encrypted Media Extensions API](/en-US/docs/Web/API/Encrypted_Media_Extensions_API) represents a context for message exchange with a content decryption module (CDM).
{{InheritanceDiagram}}
## Instance properties
- {{domxref("MediaKeySession.closed")}} {{ReadOnlyInline}}
- : Returns a {{jsxref("Promise")}} signaling when a `MediaKeySession` closes. This promise can only be fulfilled and is never rejected. Closing a session means that licenses and keys associated with it are no longer valid for decrypting media data.
- {{domxref("MediaKeySession.expiration")}} {{ReadOnlyInline}}
- : The time after which the keys in the current session can no longer be used to decrypt media data, or `NaN` if no such time exists. This value is determined by the CDM and measured in milliseconds since January 1, 1970, UTC. This value may change during a session lifetime, such as when an action triggers the start of a window.
- {{domxref("MediaKeySession.keyStatuses")}} {{ReadOnlyInline}}
- : Contains a reference to a read-only {{domxref("MediaKeyStatusMap")}} of the current session's keys and their statuses.
- {{domxref("MediaKeySession.sessionId")}} {{ReadOnlyInline}}
- : Contains a unique string generated by the CDM for the current media object and its associated keys or licenses.
### Events
- {{domxref("MediaKeySession.keystatuseschange_event", "keystatuseschange")}}
- : Fires when there has been a change in the keys in a session or their statuses.
- {{domxref("MediaKeySession.message_event", "message")}}
- : Fires when the content decryption module has generated a message for the session.
## Instance methods
- {{domxref("MediaKeySession.close()")}}
- : Returns a {{jsxref("Promise")}} after notifying the current media session is no longer needed and that the CDM should release any resources associated with this object and close it.
- {{domxref("MediaKeySession.generateRequest()")}}
- : Returns a {{jsxref("Promise")}} after generating a media request based on initialization data.
- {{domxref("MediaKeySession.load()")}}
- : Returns a {{jsxref("Promise")}} that resolves to a boolean value after loading data for a specified session object.
- {{domxref("MediaKeySession.remove()")}}
- : Returns a {{jsxref("Promise")}} after removing any session data associated with the current object.
- {{domxref("MediaKeySession.update()")}}
- : Returns a {{jsxref("Promise")}} after loading messages and licenses to the CDM.
## Examples
```js
// TBD
```
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}