Fix NS_E_WMP_WMDM_LICENSE_NOTEXIST 0XC00D11A6 sync error

You're trying to sync a song to your phone or MP3 player, and Windows Media Player throws NS_E_WMP_WMDM_LICENSE_NOTEXIST with code 0XC00D11A6. The message says “This file does not have sync rights.” It's annoying because the file plays fine on your PC. The reason is the license file – the small DRM file that grants sync permission – got deleted or corrupted. Here's the fix that works every time.

Fix: Delete the DRM folder and restart WMP

Close Windows Media Player completely. Check your system tray – right-click the WMP icon and pick “Exit.”
Open File Explorer. In the address bar, paste this and press Enter:
```
%USERPROFILE%\AppData\Local\Microsoft\Media Player
```
Look for a folder named DRM inside that Media Player folder. Delete the entire DRM folder. Not the files inside – the whole folder.
Restart Windows Media Player. It'll recreate the DRM folder with fresh license files the next time you play a protected file.
Try syncing again. The error should be gone.

Important: If you don't see the Media Player folder at all, make sure hidden files are visible. In File Explorer, click “View” then “Show” and check “Hidden items.” The AppData folder is hidden by default.

Why this works

The DRM folder stores cached licenses for protected media files – songs you bought from stores like the old Zune Marketplace or ripped from a CD with copy protection. When WMP tries to sync a file, it checks that folder for a matching license. If the license is missing, corrupted, or has an invalid path, you get error 0XC00D11A6. Deleting the DRM folder forces WMP to request a fresh license from the file's metadata or from Windows Media DRM services. It's safe because the licenses are stored inside your account; they're not bound to that exact folder path. WMP rebuilds them on the fly.

What's actually happening under the hood: WMP uses the Windows Media Device Manager (WMDM) to transfer files. WMDM calls a COM component that reads the license store. If the store is inconsistent – say the folder exists but an index file is missing – WMDM reports NS_E_WMP_WMDM_LICENSE_NOTEXIST. By deleting the whole folder, you remove the inconsistent state. WMP then re-creates the folder with a clean index and re-fetches licenses as needed.

Less common variations of the same root cause

If deleting the DRM folder didn't do it, the problem might be one of these:

Corrupted media library database: Sometimes the database file CurrentDatabase_372.wmdb in the same Media Player folder has an entry pointing to a phantom license. Delete the entire Media Player folder (not DRM alone) and let WMP rebuild its library. You'll lose play counts and ratings, but it often resolves stubborn sync errors.
File was acquired from a broken store: If the song was purchased from a store that's now defunct (like Yahoo Music Store or Napster), the license server might be gone. In that case, you can't get a new license. Your only option is to strip the DRM from the file using a tool like Aimersoft DRM Media Converter or simply re-rip the CD. This is rare today – most stores stopped using DRM years ago.
WMP version mismatch: On Windows 11, WMP 12 is included but sometimes disabled. If you're using the old WMP from Windows Media Center, the DRM subsystem might conflict. Uninstall any third-party codec packs that bundle older WMP components, then run sfc /scannow from an admin command prompt to restore system files.
User profile corruption: If you've tried everything and still get the error on multiple file types, your user profile might have a corrupted license store. Create a new local user account, transfer your music, and test sync there. If it works, migrate to the new account.

Prevention

To avoid this error coming back:

Don't manually delete files inside the DRM folder. WMP expects a specific structure. Always delete the whole folder instead of trying to fix individual files.
Back up your media library database (the CurrentDatabase_372.wmdb file) after you've verified sync works. If the error returns, you can restore that backup instead of rebuilding your library from scratch.
Avoid using disk cleaners (like CCleaner) that target Windows Media Player cache. They often delete DRM license files without warning. Disable the “Windows Media Player” entry in any disk cleaner's settings.
If you sync frequently, stick to MP3 files without DRM. WMA files with DRM are the usual culprit. Convert your library to MP3 using a tool like Foobar2000 with the WMA decoder plugin – then the DRM layer isn't involved at all.

One more thing: if you're on Windows 10 version 22H2 or later, make sure Windows Media Player is the default player for the file types you're syncing. Go to Settings > Apps > Default apps, search for “Windows Media Player,” and set it for .wma, .wmv, and .asf extensions. A misconfigured default can confuse the DRM pipeline.

That's it. The DRM folder deletion takes 30 seconds and fixes 90% of 0XC00D11A6 cases. You won't lose your music – just the cached permissions, which WMP re-creates instantly.