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NS_E_DRM_CHECKPOINT_CORRUPT
The exact DRM condition
NS_E_DRM_CHECKPOINT_CORRUPT is Windows Media DRM HRESULT 0xC00D2797. It identifies the DRM checkpoint itself fails integrity or structure validation. The useful scope 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; it is not a generic statement that the media player, network or file system failed.
The surrounding protocol and store state
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.
Evidence worth preserving
- Code-specific proof: preserve checkpoint bytes, hash and first parser/verification failure.
- 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 corrupt” 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.
Related codes and the diagnostic split
| Result | Different condition |
|---|---|
NS_E_DRM_CHECKPOINT_MISMATCH | The DRM checkpoint does not match the protected data-store generation. |
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 corrupt” condition in one incident. Order the event chain by timestamp and prefer the first code produced at the lowest specific boundary over a later player-level summary.
Diagnostic sequence
- Prove the boundary by ensuring you can preserve checkpoint bytes, hash and first parser/verification failure.
- After you restore a valid matching checkpoint or supported store generation, verify both the requested right and the final store/device state.
Correcting the producing condition
Resolve the underlying condition directly: restore a valid matching checkpoint or supported store generation. A player reinstall, reboot or new license request is useful only when it changes the condition “checkpoint corrupt” and can be verified against the original evidence.
Representative case: A crash leaves a partially written checkpoint file.
Actions that do not prove a fix
- 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.
Technical references
- Licenses and the local license store.
- Enumerating licenses in the local store.
- DRM client interfaces — API and state rules for the DRM operation described here.
- Windows Media DRM error codes.
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