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NS_E_DRM_MUST_REGISTER
Interpret the security decision
At 0xC00D28A5, NS_E_DRM_MUST_REGISTER records that the receiver has no valid entry in the transmitter registration database. This result runs inside WMDRM for Network Devices, where the implementation handles 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.
To prove this boundary rather than infer it from a dialog, look up the certificate and serial-number pair in the registration database.
Do not lose object identity
The security decision represented by this result depends on device certificate and serial number, registration-database entry, approval flag, validation timestamp, network session, protocol message and transcrypt policy. Record the exact WMDRM-ND message type, device identifier, certificate chain, registration state, round-trip timing and the first protocol HRESULT from the same it attempt.
The comparison is useful only if it preserves the fact that the receiver has no valid entry in the transmitter registration database.
From HRESULT to cause
- Preserve this result and
0xC00D28A5before cleanup, fallback or another media item changes the context. - Associate it with its current WMDRM for Network Devices object and the requested action.
- Run the direct check for it: look up the certificate and serial-number pair in the registration database.
- Compare the failure with a known-good case that changes only the property named by this condition: the receiver has no valid entry in the transmitter registration database.
- Apply the narrow correction for it: process the registration request and create the device record.
- Repeat the same action with the same content/device identity and verify that it is not replaced by another policy or trust failure.
How the operation should advance
When documenting it, state the rejected input and the expected successor state. The rejected input is demonstrated when you look up the certificate and serial-number pair in the registration database; the successor becomes reachable after you process the registration request and create the device record. This distinction prevents a license-policy result from being hidden by a later Player dialog and keeps the test attached to the original object generation.
Keep the scope narrow
The established fact is that the receiver has no valid entry in the transmitter registration database. That fact does not independently establish damaged media bytes, a missing decoder, a generally broken network, or invalid rights for every other action.
If the Player, encoder, setup program or device layer later emits a broader error, retain it as the first specific result. The object and operation attached to it are usually more diagnostic than a later cleanup or user-interface summary.
Values to compare
| Field | Value |
|---|---|
| Temporal state | trusted/system time, validity interval, request sequence and retry number when they influence it |
| Lower result | the earliest store, network, cryptographic, driver or provider status preceding the final it wrapper |
| Owner | operation, API/callback, object or session identifier, and component/device version associated with it |
| Direct check | look up the certificate and serial-number pair in the registration database |
| Policy input | requested action plus the exact license, certificate, profile, output or registration property evaluated by it |
Distinguish from nearby results
| Result | Why it points elsewhere |
|---|---|
NS_E_DRM_DEVICE_LIMIT_REACHED | the transmitter has reached the number of network devices allowed by policy or implementation |
NS_E_DRM_UNABLE_TO_VERIFY_PROXIMITY | the timed proximity exchange did not prove that the receiver is sufficiently near the transmitter |
NS_E_DRM_MUST_APPROVE | the receiver is registered but lacks the user approval required before content transfer |
Fix and verify
Recovery should change the failed precondition by choosing to process the registration request and create the device record. Success means that the same requested action is accepted after that precise state change, not merely that another file or device happens to work.
- Evidence for it is easy to destroy; Do not delete the complete device-registration database before preserving the failing device record and certificate chain; that removes the distinction between registration, approval, validation and session failures.
- Do not alter trusted time, revocation enforcement, certificate validation or output policy merely to suppress it; that bypasses the decision instead of correcting its input.
- Retain one failing artifact and one corrected artifact so the resolution of it can be regression-tested.
Completion criterion
For the final it test, keep the content KID or file hash, requested action, user/account, device identity and output route unchanged wherever they apply.
Technical references
- Windows Media DRM 10 for Network Devices — documents the protocol or API boundary behind it.
- Device registration — provides the normative workflow relevant to it.
- Using the WMDRM-ND protocol — lists the security and state transitions used to interpret it.
- MS-DRMND protocol specification — defines the platform objects used when diagnosing it.
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