NS_E_DRM_DEBUGGING_NOT_ALLOWED (0XC00D2767) Fix

Cause #1: Debugger Attached to the Process

The culprit here is almost always a debugger latched onto the process that's trying to play or decrypt DRM content. Windows Media DRM checks if a debugger is present via IsDebuggerPresent() or NtQueryInformationProcess, and it blocks playback if it finds one. This isn't a bug — it's by design. DRM systems hate being traced.

Common triggers:

• You're running the app under Visual Studio with F5 (debug mode).
• WinDbg is attached to the process for troubleshooting.
• A just-in-time (JIT) debugger is set as the default in Windows.
• You have a third-party debugging tool like Cheat Engine or OllyDbg running in the background.

How to fix it

1. Close the debugger app. Shut down Visual Studio, WinDbg, or any other debugger completely.
2. If you're using Visual Studio, run the app without debugging instead: press Ctrl+F5 or select Start Without Debugging from the Debug menu.
3. If you need to debug other code but not the DRM part, detach the debugger before hitting the DRM call. In VS, go to Debug > Detach All.
4. For WinDbg, type .detach in the command line to detach from the process.

Cause #2: A System-Wide Debugger or Kernel Debugger Is Active

Sometimes you're not directly debugging the app, but a kernel debugger is running. This happens if you've set up dual-machine debugging or enabled local kernel debugging. DRM sees the kernel debugger and assumes any user-mode process is compromised.

Check for this:

• Open a command prompt as admin and run: bcdedit /debug. If it says debug Yes, kernel debugging is enabled.
• You might have Boot Debugging set in the Windows boot menu (common on dev machines).

How to fix it

1. Disable kernel debugging: bcdedit /debug off
2. If you're using a virtual machine, make sure you're not passing debug flags to the VM through Hyper-V or VMware.
3. Reboot — this takes effect after a restart.

If you actually need kernel debugging for driver work, you're out of luck — DRM won't play nice with it. You'll need to test DRM content on a separate machine without kernel debugging.

Cause #3: A Background Process or Service Acts Like a Debugger

Some tools hook into processes in ways that trigger the DRM check. Examples include:

• Microsoft Application Verifier (AppVerif.exe) — common in dev environments.
• Sysinternals Process Monitor (procmon.exe) when set to attach to processes.
• Antivirus or security software with aggressive process monitoring (rare, but I've seen it with older McAfee versions).
• Graphics debuggers like NVIDIA Nsight or Intel GPA.

These tools don't act like traditional debuggers, but DRM's check is broad — it flags any process that has debug privileges on the target.

How to fix it

1. Check Task Manager for any of these tools running. Kill them.
2. Temporarily disable real-time monitoring in your antivirus if it's aggressive (but only as a test — turn it back on).
3. If you're using AppVerifier, disable the rule set for the target app: run appverif.exe -delete MyApp.exe

Pro tip: Use Process Explorer (from Sysinternals) to see if any process has Debug privileges. Sort by the Privileges column and look for SeDebugPrivilege. If you see it on an unrelated process, that process is the troublemaker.

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