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NS_E_DRM_LICENSE_NOWDM
The state behind the HRESULT
NS_E_DRM_LICENSE_NOWDM belongs to the point where the protected audio license requires WDM audio drivers, but the active path is not WDM-capable. This result runs inside Windows Media DRM client internals, where the implementation handles the client DRM engine that initializes security components, validates content and license identifiers, performs individualization, manages license chains and coordinates protected playback capabilities.
A useful test is to record the audio driver model and endpoint selected for protected playback.
State table
| Field | Value |
|---|---|
| Temporal state | trusted/system time, validity interval, request sequence and retry number when they influence this result |
| Direct check | record the audio driver model and endpoint selected for protected playback |
Build a useful incident record
It is meaningful only while the following state remains associated with one operation: DRM component version, KID, content header signature, license chain, uplink license, individualization state, portable-device registrations and local configuration. Preserve the KID and header hash, DRM component version, individualization status, license-chain identifiers, registry/configuration lookup and the first client callback reporting the failure.
A later generic error must not replace this evidence: the original condition remains that the protected audio license requires WDM audio drivers, but the active path is not WDM-capable.
Reconstruct the decision
It should be modeled as a failed precondition, not as an arbitrary media exception. Demonstrate the precondition by choosing to record the audio driver model and endpoint selected for protected playback, and remove it by choosing to install/use a supported WDM driver path. Use a known-good counterpart only as a control; do not replace the failing artifact before its identifiers and hashes are recorded.
Interpretation limits
The protected audio license requires WDM audio drivers, but the active path is not WDM-capable.
Focused verification
- Preserve it and
0xC00D280Cbefore cleanup, fallback or another media item changes the context. - Compare the failure with a known-good case that changes only the property named by this condition: the protected audio license requires WDM audio drivers, but the active path is not WDM-capable.
- Apply the targeted fix: install/use a supported WDM driver path.
- Associate it with its current Windows Media DRM client internals object and the requested action.
- Run the direct check: record the audio driver model and endpoint selected for protected playback.
Neighboring security decisions
| Result | Why it points elsewhere |
|---|---|
NS_E_DRM_LICENSE_NOSAP | the license requires Secure Audio Path capability that the active client cannot supply |
NS_E_DRM_LICENSE_NOSVP | the license requires a Secure Video Path capability unavailable in the selected environment |
NS_E_DRM_LICENSE_NOTRUSTEDCODEC | the codec selected for protected content does not meet the license trust requirement |
Repair criterion
The appropriate response is to install/use a supported WDM driver path.
Technical references
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