If you encounter an error message when trying to play content, make sure you have the latest version of your browser. Sometimes automatic updates do not work.
In this case,
If you are using Chrome, follow this link: https://support.google.com/chrome/answer/111996?p=fix_chrome_updates&visit_id=637769694165352539-1302859110&rd=1&hl=en-GB&sjid=5321444660348462680-EU
If the problem persists, but you can watch trailers, check these instructions on how to update the CDM module:
https://www.remote.tools/remote-work/widevine-content-decryption-module#outdated
Or the following link if your browser is Firefox:
Firefox: https://support.mozilla.org/en-US/kb/how-update-add-ons
If the problem persists, but you can watch trailers, check these instructions on how to update the CDM module:
https://support.mozilla.org/en-US/kb/enable-drm?#w_troubleshooting
After updating the CDM, restart your computer before trying to watch a movie on Rakuten TV.