What does HRESULT 0xC00D271B (NS_E_DRM_ENUM_LICENSE_FAILED) mean?

NS_E_DRM_ENUM_LICENSE_FAILED

Where the operation stopped

0xC00D271B maps to NS_E_DRM_ENUM_LICENSE_FAILED. Read it as a result from local license store, secure store and machine binding: enumeration of licenses in the local repository stopped with an error. Keeping the “enum license failed” boundary intact prevents a later playback message from hiding the original DRM failure.

Record enumeration handle creation, last license returned and the first corrupt or inaccessible record.

State to capture before retry

• Code-specific proof: record enumeration handle creation, last license returned and the first corrupt or inaccessible record.
• 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.

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. Start from 0xC00D271B and map it to the first WMDRM object that returned it.
2. Separate content/header evidence, license evidence, machine/device evidence and service/network evidence around “enum license failed”.
3. Before retrying this result, check whether another “enum license failed” operation was active or whether the previous result may have committed partially.
4. Apply the smallest supported fix: repair the repository boundary and restart enumeration from a fresh object; avoid resetting unrelated protected state.

Targeted fix

The supported response to this result is narrow: repair the repository boundary and restart enumeration from a fresh object. After correcting it, reopen or recreate the object that owned “enum license failed” so the verification does not reuse state from the failed operation.

Representative case: Listing licenses succeeds for several entries and then fails on one store record.

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.

Nearby results with different meanings

Verification after correction

A valid regression has two fixtures: one that deliberately produces “enumeration of licenses in the local repository stopped with an error” and one that applies the targeted correction. Compare callback order, selected license/KID, final rights decision and persistence state; disappearance of the “enum license failed” dialog alone is not proof.

Code-specific operational note

The user-facing message “License storage is not working.

Technical references

• Licenses and the local license store.
• Enumerating licenses in the local store.
• DRM client interfaces.
• Windows Media DRM error codes