The license request challenge format, 'octet-stream' or 'text'
The HTTP request headers to be set in the license request as an object containing list of key/values pairs
Priority level of the key system to be selected (0 is the highest prority, -1 for undefined priority)
The licenser server certificate as a BASE64 string representation of the binary stream
The licenser server URL
The session id (see https://w3c.github.io/encrypted-media/#session-id)
The session type (see https://w3c.github.io/encrypted-media/#dom-mediakeysessiontype)
The video robustness level
Wether license request is made using credentials
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The audio robustness level