What does HRESULT 0xC00D2799 (NS_E_HDS_KEY_MISMATCH) mean?

NS_E_HDS_KEY_MISMATCH

The exact DRM condition

0xC00D2799 maps to NS_E_HDS_KEY_MISMATCH. Read it as a result from local license store, secure store and machine binding: the key protecting hardware-dependent DRM state does not match the stored data. Keeping the “hds key mismatch” boundary intact for NS_E_HDS_KEY_MISMATCH prevents a later playback message from hiding the original DRM failure.

The built-in message summarizes the user-visible outcome, while the symbolic phrase “hds key mismatch” preserves the exact WMDRM boundary for diagnosis. For this code, the proof step is to correlate hardware identity, HDS key generation and store provenance.

Place in the DRM workflow

The workflow around NS_E_HDS_KEY_MISMATCH matters: a license is stored in the protected local license store after acquisition; a store failure is therefore distinct from a server refusing to issue a license. In addition, machine-bound state cannot be diagnosed safely by copying store files between computers or by deleting the original before evidence is preserved.

A useful investigation order

1. Preserve NS_E_HDS_KEY_MISMATCH, the calling interface and the first lower-level status before a wrapper replaces it.
2. Correlate NS_E_HDS_KEY_MISMATCH with one KID/license ID, content hash, device certificate or migration operation ID for this path.
3. Reconstruct the state transition immediately preceding “hds key mismatch” instead of starting from the final player dialog.
4. Prove the boundary by ensuring you can correlate hardware identity, HDS key generation and store provenance.
5. After you restore matching machine-bound state or reacquire rights, verify both the requested right and the final store/device state.

State to capture before retry

Capture the first NS_E_HDS_KEY_MISMATCH occurrence before retry or teardown changes state. The smallest useful record contains:

• Code-specific proof: correlate hardware identity, HDS key generation and store provenance.
• Protected identity: first store API call that failed: open, enumerate, save, close or query.
• Operation state: license identifier and content key identifier (KID).
• Persistence or transport: store path, file generation, access result and underlying system error.
• Security context: hardware identity and the last hardware or operating-system change.
• Correlation point: checkpoint, secure-store and registry persistence sequence.

Prefer IDs, hashes, sizes, and timestamps. Never log keys, passwords, licenses, or decrypted media.

What not to do first

• Avoid deleting or resetting DRM state before recording hashes, timestamps and the first store error. That changes evidence without demonstrating why NS_E_HDS_KEY_MISMATCH was produced.
• Avoid copying a protected license store from another computer as a repair. That shortcut can create a second store, identity or policy problem.
• Do not reduce NS_E_HDS_KEY_MISMATCH to “DRM failed” in telemetry; retain the HRESULT, symbolic name, operation and object identity.

Narrow remediation

Resolve NS_E_HDS_KEY_MISMATCH at its producing boundary: restore matching machine-bound state or reacquire rights. A player reinstall, reboot or new license request is useful only when it changes the “hds key mismatch” boundary and can be verified against the original evidence.

Representative case: DRM state from one machine image is mounted under another hardware identity.

Nearby results with different meanings

Order the NS_E_HDS_KEY_MISMATCH event chain by timestamp; prefer the earliest specific result.

Verification after correction

Repeat the operation that originally returned NS_E_HDS_KEY_MISMATCH. Assert the exact HRESULT at the producing API in the failing “hds key mismatch” fixture; then change only the decisive precondition and confirm that the corrected run completes without substituting a neighboring DRM result. After correcting NS_E_HDS_KEY_MISMATCH, verify the requested action and the final license-store, secure-clock, device or migration state relevant to “hds key mismatch”.

Code-specific operational note

The symbolic phrase “hds key mismatch” is the important search and telemetry key for NS_E_HDS_KEY_MISMATCH. Keep it beside the exact value 0xC00D2799; the official message “The requested action cannot be performed because a problem occurred with the Windows Media Digital Rights Management (DRM) components on your computer.” is useful to users, but it does not identify the producing API, object generation or protected identity on its own.

Technical references

• Licenses and the local license store — platform documentation used to distinguish this result from adjacent results.
• Enumerating licenses in the local store — official Windows Media DRM context for NS_E_HDS_KEY_MISMATCH.
• DRM client interfaces — API and state rules relevant to this boundary.
• Windows Media DRM error codes

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