NS_E_DRM_APPCERT_REVOKED (0xC00D2752) DRM Fix

Quick answer: Delete the DRM store folder (usually C:\ProgramData\Microsoft\Windows\DRM), reboot, and let Windows rebuild it. The revoked app certificate lives in that store, so clearing it forces a fresh, valid one.

What's actually happening here is that Windows Media DRM keeps a small database of certificates, licenses, and security upgrades in a folder on disk. The error string NS_E_DRM_APPCERT_REVOKED literally means: the application certificate bound to whatever DRM-protected file or stream you're trying to play has been revoked. Not expired. Revoked. That's a deliberate kill signal from Microsoft's DRM infrastructure, and it usually shows up when a media app hasn't checked in with the DRM servers in a long time, or when a security upgrade got half-applied.

You'll see this most often on Windows 7 and Windows 8.1 machines playing WMA/WMV files from a licensed store, or hitting a Silverlight-based streaming service. It also pops up on Server 2012 R2 boxes running Windows Media Services. Fresh Windows 10/11 installs almost never see it because Microsoft quietly deprecated the classic WMDRM stack — but if you're still using it, you'll know.

Fix 1: Reset the DRM store

Close every media app. Windows Media Player, Zune, Silverlight, browsers — all of them. Anything holding a handle on the DRM folder will block the reset.
Stop the Windows Media Player Network Sharing Service if it's running. Open services.msc, find it, right-click, Stop.
Open File Explorer with admin rights. You need to see hidden and system files — in Explorer, View → Options → View tab → uncheck "Hide protected operating system files."
Navigate to C:\ProgramData\Microsoft\Windows\DRM. On older systems it might be in %ALLUSERSPROFILE%\DRM or C:\Documents and Settings\All Users\DRM.
Rename the DRM folder to DRM_old. Don't delete it yet — if something breaks you can put it back.
Reboot. Windows rebuilds the DRM store on the next DRM operation.
Open the media file again. The player will pull a fresh app certificate. If you're online, that happens automatically.

The reason step 5 works is that the DRM store is a self-healing database. It's not a config file you edit — it's a folder of machine-specific blobs. Delete them, and the next DRM call triggers a bootstrap that downloads new certificates from Microsoft's DRM provisioners. Revoked ones get left behind.

Fix 2: If the store reset doesn't stick

Sometimes the folder comes right back with the same revoked certificate inside, which means something is restoring it. Common culprits: System Restore snapshots, a backup agent, or a domain Group Policy that pushes a DRM provisioning package. Check these:

System Restore: temporarily disable it on the system drive. Restore points can and do bring back the DRM folder.
Group Policy: run gpresult /h report.html and search the output for "DRM". Enterprise environments occasionally ship a stale provisioning blob.
Third-party backup: Veeam, Acronis, Carbonite — any of them doing full-file backups will happily restore C:\ProgramData\Microsoft\Windows\DRM on the next cycle.

Fix 3: Re-register the DRM components

If the folder is empty and you still get 0xC00D2752, the DLL registration itself is broken. From an elevated command prompt:

regsvr32 /s wmdrmsdk.dll
regsvr32 /s drmclien.dll
regsvr32 /s drmv2clt.dll
regsvr32 /s wmp.dll
regsvr32 /s wmplayer.exe

Then re-run the DRM folder reset. The re-registration forces Windows to re-enumerate the DRM providers, which is what actually gets a valid app certificate issued.

Fix 4: IndivIDUALS — the old manual approach

If you're on XP or Vista and none of the above works, there used to be a tool called IndivIDUALS (yes, that's really its name) that wiped the DRM store and forced a fresh individualization. It's discontinued and Microsoft's download link is dead, but archived copies exist. I'd only touch it on a machine you don't care about — it modifies the same store you can just delete manually, and the manual reset is safer.

What NOT to do

Reinstalling Windows Media Player does nothing here. Neither does clearing your browser cache, resetting your Microsoft account, or running sfc /scannow. The DRM store isn't a protected system file and SFC doesn't touch it. Those are the three fixes everyone tries first and they all waste an hour.

Also skip the various "DRM removal" tools floating around. Most of them are either dead projects that no longer work against current WMDRM, or malware dressed up as a utility. If you legitimately own the content, the store reset is the right fix. If you don't, that's a different conversation.

Prevention

The DRM store goes stale when a machine is offline for months at a time — think kiosks, lab PCs, or a laptop that lives in a drawer. The app certificate has a validity window, and if the machine never talks to the provisioning servers, it can't renew. Put the affected machines on a schedule where they hit the internet at least once every 30 days and open a DRM-protected file. That's it. That single action keeps the certificate current and you'll never see 0xC00D2752 again on that box.

If you're administering a fleet and this is recurring, the real answer is to migrate off classic WMDRM. It's a deprecated stack. Microsoft hasn't shipped security updates for the DRM provisioning endpoints in years, and any content still relying on it is on borrowed time.