Fix NS_E_DRM_INVALID_PROPERTY (0xC00D2749) Fast

You're here because Windows Media Player won't play a song or video, and it throws NS_E_DRM_INVALID_PROPERTY (0xC00D2749). I've seen this dozens of times. Let's fix it.

This error means the DRM license for that file is missing a required property. Usually happens after a Windows update, a system restore, or when you copy protected files to a new computer. The file itself is fine, but the license is broken.

The Direct Fix: Reset All DRM Licenses

We'll use a built-in Windows tool called drmreset. It clears out the corrupted license store so Windows rebuilds it fresh.

1. Close Windows Media Player and any other app that might be using DRM content (like Netflix or Spotify).
2. Press Windows Key + R to open the Run dialog.
3. Type cmd and press Ctrl+Shift+Enter to run Command Prompt as administrator. Click Yes on the UAC prompt.
4. In the black Command Prompt window, type or paste this command and press Enter:

   drmreset

5. You'll see a message like "Configuring DRM..." and then "The operation completed successfully." Wait for that.
6. Close the Command Prompt. Restart your computer. Not just log off, but a full restart.
7. Open Windows Media Player again. Try playing the file that gave the error. It should work now.

What you should see: After restarting, if you try a different protected file (like a purchased music track), Windows will download new licenses automatically. You might see a brief "Acquiring license" popup. That's normal.

Why This Works

drmreset is a Microsoft tool that deletes the local DRM license store and resets the DRM subsystem. Think of it as clearing a clogged pipe. The license store is a folder at C:\ProgramData\Microsoft\Windows\DRM. When a file needs a license, Windows checks this folder. If the property is missing (the error code says "property not set"), the file can't play. Resetting it forces Windows to download fresh licenses next time you play any protected content.

I've used this on Windows 7 through Windows 11. Same fix every time. It's the first thing I try.

Less Common Variations

1. Specific File, Not All Files

If only one file gives this error while others play fine, the license for that file is permanently corrupted. The drmreset command may not help because it resets the store, not individual licenses. In this case, you have two options:

• Re-download the file from the store where you bought it (iTunes, Amazon, etc.).
• Use an alternative player like VLC Media Player, which doesn't use Windows DRM. This bypasses the error because VLC reads the audio/video stream directly.

2. Error Appears in Apps Like Netflix or Hulu

Sometimes the error shows up in a web browser or a UWP app like Netflix. That's a different beast. Close all browser tabs. Then run drmreset as admin. If that doesn't fix it, you may need to reset the Microsoft Store cache:

1. Press Windows Key + R, type wsreset.exe, press Enter.
2. A blank Command Prompt will appear and close automatically. Wait 30 seconds.
3. Test the app again.

3. Error After Installing Windows Media Player Codecs

If you recently installed a codec pack (like K-Lite), it can sometimes overwrite parts of the DRM system. Uninstall the codec pack, run drmreset, then reinstall the codec pack from a trusted source. Use the Windows Media Player troubleshooting tool too: Settings > Update & Security > Troubleshoot > Additional troubleshooters > Windows Media Player.

How to Prevent This From Happening Again

• Don't copy DRM-protected files between computers. Licenses are tied to the machine that downloaded them. Instead, re-download the file from the service you bought it from.
• Keep Windows updated. Microsoft often fixes DRM-related bugs in cumulative updates. Run Windows Update monthly.
• Avoid third-party DRM removal tools. They corrupt licenses more often than they fix them. I've seen users make things worse.
• Back up your license store only if you know what you're doing (advanced users: copy C:\ProgramData\Microsoft\Windows\DRM before a system wipe).

That's it. Run drmreset, restart, and you're likely back in business. If not, try the file-specific workarounds above. You got this.