I will be happy to help to do it, but I don't know where to start.

Did you try licenseXhrSetup?
In the config, set licenseXhrSetup = function(xhr, url){/inject token to xhr/}

Thank you @htleeab , sorry for the delay.

Actually even if I configure the widevineLicenseUrl I keep havinf requests to the fairplay licence server configured in the manifest. 🤔 And I never reach the licenseXhrSetup function.

Is there an example of the widevine licence usage?

Bump. If one searches google or the issue list here for widevineLicenseUrl or getEMELicenseFunc there are only a few not-useful links.

The best information I've found so far is here: https://github.com/realeyes-matthew/hls.js/blob/widevine-eme/docs/API.md#encypted-media-extensions-eme

and here in the shaka packager demo https://hls-js.netlify.com/demo/ (the shaka demo does not play for me in Firefox or Chrome btw)

{
  "debug": true,
  "enableWorker": true,
  "liveBackBufferLength": 900,
  "widevineLicenseUrl": "http://cwip-shaka-proxy.appspot.com/no_auth",
  "emeEnabled": true
}

I did not find getEMELicenseFunc in the origin hls.js sources so I'm not too certain about them. A sample configuration from a player instance using it would be valuable.