What this error means
Many streaming sites deliver video as small segments (HLS). Some encrypt each segment with a key the player downloads separately. XDM fetches that key too, the same way the player does. This error means the key request failed, returned something that isn’t a key, or the key didn’t match the data.
What you can try
- Download again from the playing video. Keys are often short-lived and tied to your session. Reload the page, play the video, and pick the format from the XDM extension again.
- Stay signed in. If the site requires an account, make sure you're logged in before playing the video.
- Add the headers the site needs when using the Stream
download dialog manually: cookies and the
Refererheader are usually required for the key request too.
DRM-protected video can't be downloaded
Services that protect video with DRM (Widevine, PlayReady, FairPlay), such as paid streaming platforms, never hand out the decryption key to other programs. XDM does not and will not circumvent DRM.