This error message indicates that the CDM of the browser has been revoked by Google Widevine.This revocation of certificates is nothing related to Axinom DRM. What happens is, Google maintains a list of device type certificates that are considered valid and allows the respective devices to receive DRM licenses.
This list is being maintained by Google on a daily basis. For example, if Google determines that a specific device type’s Widevine CDM implementation has been “hacked” or for other reasons is not considered secure anymore, then Google can remove this device type certificate from the above-mentioned “white list”.
Any DRM license service, including Axinom DRM, continuously downloads updates of this white list from Google, typically on a daily basis. If a device type is removed from the list then any devices of that type will not receive DRM licenses going forward.
So updating the Chrome browser typically updates the CDM and you can still update the CDM version manually. With Firefox, rarely auto-update doesn’t work. You still have to do it manually, maybe this is only for Linux.
If users cannot update the Chrome browser version, then they can still try to just update the Widevine CDM.
They can navigate to "chrome://components/" and look for “Widevine Content Decryption Module” (the current version of the CDM will be displayed next to this). There should be a button “Check for update”. Then if the updates are available, user can get the CDM version updated by them selves.
If you need further explanations or clarifications, please feel free to contact "Axinom Product Support".