Fix NS_E_DRM_INVALID_APPDATA_VERSION 0XC00D2741

You'll see this error when Windows Media Player or Silverlight tries to play protected content and its DRM data is stale or corrupted. One common trigger: you upgraded from Windows 7 to Windows 10, and the old DRM files aren't compatible with the new OS. Another: you used a disk cleanup tool that nuked part of the DRM store, leaving it half-alive.

What's actually going on?

The Digital Rights Management component in Windows stores license and content version info in a hidden folder. That folder has a version header that tells the DRM engine what format it's dealing with. When the header doesn't match what the current OS or Media Player expects, you get 0XC00D2741. It's not a hardware failure. It's not a network issue. It's just a bad version tag on a bunch of old files.

The culprit here is almost always a mismatch between the DRM folder's version and the current Windows version. Windows 10 and 11 use a different DRM schema than Vista or 7. If you've ever restored a backup from an old machine, you've probably dragged this problem into the present.

How to fix it

Here's the fix I've used on hundreds of machines. It's simple, but follow the steps in order. Don't skip ahead.

Close everything that uses DRM. That means Windows Media Player, Movies & TV, Netflix app, anything Silverlight-based. Open Task Manager and kill any process named wmplayer.exe or silverlight.exe just to be sure.
Open File Explorer and enable hidden files. Click the View tab, then check the box for "Hidden items". You need to see the ProgramData folder.
Rename the DRM folder. Go to C:\ProgramData\Microsoft\Windows\DRM. Right-click it and select Rename. Call it something like DRM_old. Windows will recreate this folder automatically the next time you play DRM content.
Clear the temporary licenses. Press Win + R, type %localappdata%\Microsoft and hit Enter. Look for a folder called DRM. If it exists, rename it to DRM_old as well. On newer Windows 10 versions, this folder might be empty or missing. That's fine.
Restart your PC. Not just sign out. Full restart. This clears any DRM processes still holding locks.
Try playing the file again. Windows Media Player will create a fresh DRM store with the correct version. You might get a prompt to download new DRM components. Accept it.

Still failing? Here's the next thing to check

If the error persists, the problem isn't the DRM store—it's the Media Player installation itself. Run this from an elevated command prompt:

sfc /scannow
dism /online /cleanup-image /restorehealth

These two commands check your system files and fix any corruption. If they find and fix something, reboot and try again.

Another angle: if you're using Silverlight (rare these days, but some older streaming sites still require it), uninstall and reinstall Silverlight. Go to Programs and Features, uninstall Silverlight, then grab the latest version from Microsoft's site.

Last resort: check your date and time. Seriously. If your system clock is wrong by more than a few minutes, DRM licensing fails. Right-click the clock, select Adjust date/time, and make sure "Set time automatically" is on.

That's the whole playbook. Nine times out of ten, renaming the DRM folder fixes it instantly. The other times, the system file checker or a time sync saves you. You won't need to reinstall Windows or buy new hardware—that's overkill for this.