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. Preserving the first NS_E_HDS_KEY_MISMATCH occurrence prevents a later playback message from hiding the original DRM failure.

Correlate hardware identity, HDS key generation and store provenance.

Place in the DRM workflow

The workflow around this result 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 this result, the calling interface and the first lower-level status before a wrapper replaces it.
2. Correlate this result 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

The smallest useful record contains:

• 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.

What not to do first

• Avoid deleting or resetting DRM state before recording hashes, timestamps and the first store error.
• Avoid copying a protected license store from another computer as a repair.

Targeted fix

Resolve the underlying condition directly: restore matching machine-bound state or reacquire rights. A player reinstall, reboot or new license request is useful only when it changes the condition “hds key mismatch” 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

Verification after correction

Repeat the operation that originally returned it. Assert the exact HRESULT at the producing API in the failing “hds key mismatch” fixture; then change only the relevant precondition and confirm that the corrected run completes without substituting a neighboring DRM result. After correcting it, 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 user-facing message “The requested action cannot be performed because a problem occurred with the Windows Media Digital Rights Management (DRM) components on your computer.” describes the visible condition but does not identify the producing API, object instance, or protected identity by itself.

Technical references

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