What does HRESULT 0xC00D273C (NS_E_DRM_GET_LICENSESTRING_ERROR) mean?

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_REPORT_ERROR	NS_E_DRM_GET_CONTENTSTRING_ERROR

NS_E_DRM_GET_LICENSESTRING_ERROR

How to classify this result

When the client returns NS_E_DRM_GET_LICENSESTRING_ERROR (0xC00D273C), the decisive condition is the client cannot obtain the serialized license string from the selected record. This result belongs to local license store, secure store and machine binding, specifically the protected repositories that hold licenses and DRM state, together with the hardware and checkpoint data used to bind that state to one installation.

The built-in message summarizes the user-visible outcome, while the symbolic phrase “get licensestring error” preserves the exact WMDRM boundary for diagnosis. For this code, the proof step is to record license identity, requested representation and returned length/status.

Minimum incident record

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

Code-specific proof: record license identity, requested representation and returned length/status.
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.

Why the producing layer matters

Two platform rules frame NS_E_DRM_GET_LICENSESTRING_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. Machine-bound state cannot be diagnosed safely by copying store files between computers or by deleting the original before evidence is preserved.

Triage without destroying evidence

Locate the earliest API return, callback or event containing NS_E_DRM_GET_LICENSESTRING_ERROR and 0xC00D273C.
Identify the exact content, license, store, device or migration object generation involved in “get licensestring error”.
Determine whether “get licensestring error” occurred before network exchange, during response validation, while enforcing policy, or while committing protected state.
Perform the code-specific check: record license identity, requested representation and returned length/status.
Make one narrow correction — replace or reacquire the malformed/inaccessible license record — and repeat the same producing operation.

Why the symbolic name matters

Result	Different boundary
`NS_E_DRM_GET_LICENSE_ERROR`	Retrieval of a license from the local store failed after lookup began.
`NS_E_DRM_LICENSE_CLOSE_ERROR`	Closing or committing an opened license record failed.
`NS_E_DRM_LICENSE_OPEN_ERROR`	Opening the local license repository or selected license record failed.

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

Shortcuts that make diagnosis worse

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

Recovery at the right layer

The corrective direction is to replace or reacquire the malformed/inaccessible license record. Preserve the original content/header, store or migration material for NS_E_DRM_GET_LICENSESTRING_ERROR until the operation succeeds and survives a fresh application object or required restart.

Representative case: License metadata is found, but serialization of the license string fails.

Completion criteria

After the repair, recreate the WMDRM object and run the smallest reproducer for NS_E_DRM_GET_LICENSESTRING_ERROR. Confirm that 0xC00D273C no longer occurs, that the intended license action completes, and that no store, certificate, clock or migration warning replaces it.

Code-specific operational note

The symbolic phrase “get licensestring error” is the important search and telemetry key for NS_E_DRM_GET_LICENSESTRING_ERROR. Keep it beside the exact value 0xC00D273C; 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 — API and state rules relevant to this boundary.
Enumerating licenses in the local store — platform documentation used to distinguish this result from adjacent results.
DRM client interfaces — official Windows Media DRM context for NS_E_DRM_GET_LICENSESTRING_ERROR.
Windows Media DRM error codes

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