HRESULT 0xC00D271B (NS_E_DRM_ENUM_LICENSE

Status / error code:

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Constant name:

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Description:

License storage is not working. Contact Microsoft product support.%0

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NS_E_DRM_INVALID_MACHINE	NS_E_DRM_INVALID_LICENSE_REQUEST

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 for NS_E_DRM_ENUM_LICENSE_FAILED prevents a later playback message from hiding the original DRM failure.

The built-in message summarizes the user-visible outcome, while the symbolic phrase “enum license failed” preserves the exact WMDRM boundary for diagnosis. For this code, the proof step is to record enumeration handle creation, last license returned and the first corrupt or inaccessible record.

State to capture before retry

Capture the first NS_E_DRM_ENUM_LICENSE_FAILED occurrence before retry or teardown changes state. The smallest useful record contains:

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.

Prefer IDs, hashes, sizes, and timestamps. Never log keys, passwords, licenses, or decrypted media.

Place in the DRM workflow

The workflow around NS_E_DRM_ENUM_LICENSE_FAILED 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

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

Narrow remediation

The supported response to NS_E_DRM_ENUM_LICENSE_FAILED is narrow: repair the repository boundary and restart enumeration from a fresh object. After correcting NS_E_DRM_ENUM_LICENSE_FAILED, reopen or recreate the object that owned “enum license failed” so cached state from the failed generation is not mistaken for the repair result.

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. That changes evidence without demonstrating why NS_E_DRM_ENUM_LICENSE_FAILED was produced.
Avoid copying a protected license store from another computer as a repair. That shortcut can create a second store, identity or policy problem.
Do not reduce NS_E_DRM_ENUM_LICENSE_FAILED to “DRM failed” in telemetry; retain the HRESULT, symbolic name, operation and object identity.

Nearby results with different meanings

Result	Different boundary
`NS_E_DRM_INVALID_MACHINE`	The protected license state is bound to a different machine identity.
`NS_E_DRM_SECURE_STORE_UNLOCK_ERROR`	The client cannot unlock secure-store state required for DRM processing.
`NS_E_DRM_LICENSE_STORE_SAVE_ERROR`	An acquired or updated license could not be committed to the local license store.

Order the NS_E_DRM_ENUM_LICENSE_FAILED event chain by timestamp; prefer the earliest specific result.

Verification after correction

A valid regression for NS_E_DRM_ENUM_LICENSE_FAILED 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 symbolic phrase “enum license failed” is the important search and telemetry key for NS_E_DRM_ENUM_LICENSE_FAILED. Keep it beside the exact value 0xC00D271B; the official message “License storage is not working. Contact Microsoft product support.” is useful to users, but it does not identify the producing API, object generation or protected identity on its own.

Technical references

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

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