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| NS_E_DRM_UNABLE_TO_CREATE_MIGRATION_IMPORTER_OBJECT | NS_E_DRM_CHECKPOINT_CORRUPT |
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.
Compare checkpoint and store generations, hashes and write chronology.
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 instance involved in “checkpoint mismatch”.
- Determine whether “checkpoint mismatch” occurred before network exchange, during response validation, while enforcing policy, or while committing protected state.
- Make one targeted change — restore a consistent pair rather than mixing backup generations — and repeat the same producing operation.
Which component owns the failure
Do not flatten this result into a generic DRM error. 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. 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
- Code-specific proof: compare checkpoint and store generations, hashes and write chronology.
- Protected identity: checkpoint, secure-store and registry persistence sequence.
- Operation state: first store API call that failed: open, enumerate, save, close or query.
- Persistence or transport: license identifier and content key identifier (KID).
- Security context: store path, file generation, access result and underlying system error.
- Correlation point: hardware identity and the last hardware or operating-system change.
For the “checkpoint mismatch” investigation, use KIDs, license IDs, hashes, certificate thumbprints, sizes and timestamps where possible. 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.
- Avoid deleting or resetting DRM state before recording hashes, timestamps and the first store error.
What a supported fix should change
To correct this, restore a consistent pair rather than mixing backup generations. Preserve the original content/header, store or migration material 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.
Do not merge these HRESULTs
| Result | Different condition |
|---|---|
NS_E_DRM_CHECKPOINT_CORRUPT | The DRM checkpoint itself fails integrity or structure validation. |
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. |
How to know the fix is real
After the repair, recreate the WMDRM object and run the smallest reproducer. Confirm that 0xC00D2796 no longer occurs, that the intended license action completes, and that no store, certificate, clock or migration warning replaces it.
Technical references
- Licenses and the local license store — API and state rules for the DRM operation described here.
- Enumerating licenses in the local store.
- DRM client interfaces.
- Windows Media DRM error codes — API and state rules for the DRM operation described here.
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