NS_E_DRM_CERTIFICATE_REVOKED - Client cert revoked fix

You're watching a video, or trying to play back a DRM-protected file, and boom — NS_E_DRM_CERTIFICATE_REVOKED (0XC00D28A1). The client's certificate has been revoked. This usually hits after a Windows update, a fresh install, or when Windows Media Player tries to re-negotiate a license and the server says your cert is no longer valid. I've seen it most often with older streaming services (think Silverlight-based sites) or corporate training videos that still use DRM.

Why this happens

Your PC holds a local DRM certificate that's used to decrypt protected content. Microsoft's licensing servers occasionally revoke old certs — usually because of a security patch or to expire stale licenses. When your local copy doesn't match what the server expects, you get this error. It's not a hardware problem, it's a file corruption or mismatch in the DRM store.

The real fix is to clear out the old DRM data and let Windows rebuild it fresh. No need to reinstall Windows or mess with registry edits that could break things. Here's the step-by-step.

Fix it in 4 steps

1. Close everything that uses DRM
   Kill Windows Media Player, any browser tabs playing protected content, and any app that might be using DRM. Check Task Manager to be sure.
2. Delete the DRM store folder
   Open File Explorer, paste this into the address bar, and hit Enter:
   

   %windir%\System32\CatRoot\{F750E6C3-38EE-11D1-85E5-00C04FC295EE}

   
   Wait for the folder to open. You'll see a subfolder called DRM or DRMStore. Delete everything inside that folder. Windows will complain some files are in use — if so, reboot into Safe Mode (hold Shift while clicking Restart) and try again.
3. Clear the license store
   Open an admin command prompt. Press Win+X, select Windows Terminal (Admin) or Command Prompt (Admin). Run:
   

   net stop Audiosrv

   
   Then delete the license files:
   

   del /f /s /q "%ProgramData%\Microsoft\Windows\DRM"

   
   Wait for it to finish, then restart the Audio service:
   

   net start Audiosrv

4. Reacquire a fresh certificate
   Open Windows Media Player. Go to Help > About Windows Media Player. You should see a link that says Acquire a new certificate or Renew license (depends on your version). Click it. It'll contact Microsoft's servers and download a new cert. If the link isn't there, just restart the PC — Windows will grab a new cert on next boot when you try to play DRM content again.

If it still fails

Sometimes the server itself is the problem. Had a client last month whose entire print queue died because of a network certificate issue — same root cause but different error. For DRM, check these three things:

• Date and time: If your system clock is off by more than a few minutes, the certificate validation fails. Sync with time.windows.com in Settings.
• Windows updates: Make sure you've installed all pending updates. Old DRM components can't talk to newer servers.
• Third-party antivirus: Some security suites block DRM renewal. Temporarily disable any firewall or web protection, then repeat the steps above.

If none of that works, the content you're trying to play might have been pulled or the service shut down. Silverlight's dead, for example. In that case, no fix will work — the server won't issue a new license even with a fresh cert. You'll need to find an alternative source.