The MediaKeySession.close() method notifies that the current media session is no longer needed, and that the content decryption module should release any resources associated with this object and close it. Then, it returns a Promise.
The MediaKeySession.closed read-only property returns a 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 Closing a session means that licenses and keys associated with it are no longer valid for decrypting media data.
The MediaKeySession.expiration read-only property returns 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.
The MediaKeySession.generateRequest() method returns a Promise after generating a media request based on initialization data.
The MediaKeySession.keyStatuses read-only property returns a reference to a read-only MediaKeyStatusMap of the current session's keys and their statuses.
The MediaKeySession.load() method returns a Promise that resolves to a boolean value after loading data for a specified session object.
The MediaKeySession.remove() method returns a Promise after removing any session data associated with the current object.
The MediaKeySession.sessionId read-only property contains a unique string generated by the CDM for the current media object and its associated keys or licenses.