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NS_E_DRM_DEVICE_ALREADY_REGISTERED
The state behind the HRESULT
NS_E_DRM_DEVICE_ALREADY_REGISTERED belongs to the point where registration attempts to create a duplicate record for the same device identity. The subsystem producing this result is WMDRM for Network Devices, not the media decoder; it performs the transmitter/receiver protocol that registers a network playback device, approves it, validates proximity, opens a protected session and transcrypts licensed content for that receiver.
Start by looking up certificate and serial number before processing the request.
State table
| Field | Value |
|---|---|
| Policy input | requested action plus the exact license, certificate, profile, output or registration property evaluated by this result |
| Temporal state | trusted/system time, validity interval, request sequence and retry number when they influence this result |
| Direct check | look up certificate and serial number before processing the request |
Build a useful incident record
Do not separate it from its owning state: device certificate and serial number, registration-database entry, approval flag, validation timestamp, network session, protocol message and transcrypt policy. The diagnostic record is the exact WMDRM-ND message type, device identifier, certificate chain, registration state, round-trip timing and the first protocol HRESULT.
The comparison is useful only if it preserves the fact that registration attempts to create a duplicate record for the same device identity.
Reconstruct the decision
When documenting it, state the rejected input and the expected successor state. The rejected input is demonstrated when you look up certificate and serial number before processing the request; the successor becomes reachable after you reuse/update the existing registration instead of inserting another. This distinction prevents a license-policy result from being hidden by a later Player dialog and keeps the test attached to the original object instance.
Interpretation limits
Registration attempts to create a duplicate record for the same device identity.
Focused verification
- Preserve it and
0xC00D28ABbefore cleanup, fallback or another media item changes the context. - Apply the targeted fix: reuse/update the existing registration instead of inserting another.
- Associate it with its current WMDRM for Network Devices object and the requested action.
- Run the direct check: look up certificate and serial number before processing the request.
- Compare the failure with a known-good case that changes only the property named by this condition: registration attempts to create a duplicate record for the same device identity.
Neighboring security decisions
| Result | Why it points elsewhere |
|---|---|
NS_E_DRM_INVALID_SESSION | the WMDRM-ND message refers to a nonexistent, expired or mismatched protocol session |
NS_E_DRM_DEVICE_NOT_OPEN | the application attempted protected transfer before opening the validated registered device |
NS_E_DRM_UNSUPPORTED_PROTOCOL_VERSION | the transmitter and receiver do not share a supported WMDRM-ND protocol version |
Repair criterion
A matching correction is to reuse/update the existing registration instead of inserting another.
- Preserve the evidence before making changes.
Technical references
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