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NS_E_DRM_CHECKPOINT_MISMATCH
How to classify this result
The symbolic result NS_E_DRM_CHECKPOINT_MISMATCH narrows 0xC00D2796 to local license store, secure store and machine binding,. In practical terms, the DRM checkpoint does not match the protected data-store generation; the producing layer is the protected repositories that hold licenses and DRM state, together with the hardware and checkpoint data used to bind that state to one installation, while tracing checkpoint mismatch.
The built-in message summarizes the user-visible outcome, while the symbolic phrase “checkpoint mismatch” preserves the exact WMDRM boundary for diagnosis. For this code, the proof step is to compare checkpoint and store generations, hashes and write chronology, for the checkpoint mismatch boundary.
How to prove the condition
- Locate the earliest API return, callback or event containing this result and
0xC00D2796. - identify the exact content, license, store, device or migration object generation involved in “checkpoint mismatch”.
- determine whether “checkpoint mismatch” occurred before network exchange, during response validation, while enforcing policy, or while committing protected state.
- Perform the code-specific check: compare checkpoint and store generations, hashes and write chronology, during checkpoint mismatch diagnosis.
- Make one narrow correction — restore a consistent pair rather than mixing backup generations — and repeat the same producing operation, in a checkpoint mismatch incident.
Which component owns the failure
Do not flatten this result into a generic DRM error, for this checkpoint mismatch result. 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, when reproducing checkpoint mismatch. The second relevant rule is that machine-bound state cannot be diagnosed safely by copying store files between computers or by deleting the original before evidence is preserved,.
Diagnostic inputs that separate the causes
Capture the first occurrence before automatic retry, player teardown, store repair or license reacquisition changes the state,. The smallest useful record contains:
- Code-specific proof: compare checkpoint and store generations, hashes and write chronology, while tracing checkpoint mismatch.
- Protected identity: checkpoint, secure-store and registry persistence sequence, for the boundary.
- Operation state: first store API call that failed: open, enumerate, save, close or query, during checkpoint mismatch diagnosis.
- Persistence or transport: license identifier and content key identifier (KID), in a incident.
- Security context: store path, file generation, access result and underlying system error, for this checkpoint mismatch result.
- Correlation point: hardware identity and the last hardware or operating-system change, when reproducing checkpoint mismatch.
For the “checkpoint mismatch” investigation, use KIDs, license IDs, hashes, certificate thumbprints, sizes and timestamps where possible. While diagnosing this result, do not place content keys, complete license blobs, passwords, cookies or decrypted media in ordinary logs,.
Common but unsafe responses
- Avoid copying a protected license store from another computer as a repair,. That changes evidence without demonstrating why this result was produced.
- Avoid deleting or resetting DRM state before recording hashes, timestamps and the first store error, while tracing checkpoint mismatch. That shortcut can create a second store, identity or policy problem, for the boundary.
- Do not reduce it to “DRM failed” in telemetry; retain the HRESULT, symbolic name, operation and object identity, during checkpoint mismatch diagnosis.
What a supported fix should change
The corrective direction is to restore a consistent pair rather than mixing backup generations, in a incident. Preserve the original content/header, store or migration material for it until the “checkpoint mismatch” operation succeeds and survives a fresh application object or required restart.
Representative case: A checkpoint from one backup is combined with a newer store file, for this checkpoint mismatch result.
Do not merge these HRESULTs
| Result | Different boundary |
|---|---|
NS_E_DRM_CHECKPOINT_CORRUPT | The DRM checkpoint itself fails integrity or structure validation, when reproducing checkpoint mismatch. |
NS_E_REG_FLUSH_FAILURE | DRM state could not be durably flushed to the registry,. |
NS_E_HDS_KEY_MISMATCH | The key protecting hardware-dependent DRM state does not match the stored data,. |
Several values can accompany the “checkpoint mismatch” condition in one incident. Order the result event chain by timestamp and prefer the first code produced at the lowest specific boundary over a later player-level summary, while tracing checkpoint mismatch.
How to know the fix is real
After the repair, recreate the WMDRM object and run the smallest reproducer for it. Confirm that 0xC00D2796 no longer occurs, that the intended license action completes, and that no store, certificate, clock or migration warning replaces it, for the boundary.
Code-specific operational note
The symbolic phrase “checkpoint mismatch” is the important search and telemetry key for it. Keep it beside the exact value 0xC00D2796; 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, during checkpoint mismatch diagnosis.” is useful to users, but it does not identify the producing API, object generation or protected identity on its own, in a incident.
Technical references
- Licenses and the local license store — API and state rules relevant to this the boundary.
- Enumerating licenses in the local store — platform documentation used to distinguish it from adjacent results.
- DRM client interfaces — official Windows Media DRM context for it.
- Windows Media DRM error codes — API and state rules relevant to this the boundary.
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