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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. NS_E_DRM_MUST_REGISTER 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. The standard AllStat text is already shown above; this custom section concentrates on the object state and the evidence needed to separate NS_E_DRM_MUST_REGISTER from neighboring Windows Media errors.
Do not lose object identity
The security decision represented by NS_E_DRM_MUST_REGISTER 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 NS_E_DRM_MUST_REGISTER 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
NS_E_DRM_MUST_REGISTERand0xC00D28A5before cleanup, fallback or another media item changes the context. - Associate
NS_E_DRM_MUST_REGISTERwith its current WMDRM for Network Devices object and the requested action. - Run the direct check for
NS_E_DRM_MUST_REGISTER: 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
NS_E_DRM_MUST_REGISTER: process the registration request and create the device record. - Repeat the same action with the same content/device identity and verify that
NS_E_DRM_MUST_REGISTERis not replaced by another policy or trust failure.
How the operation should advance
When documenting NS_E_DRM_MUST_REGISTER, 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. For NS_E_DRM_MUST_REGISTER, 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
For NS_E_DRM_MUST_REGISTER, the established fact is that the receiver has no valid entry in the transmitter registration database. For NS_E_DRM_MUST_REGISTER, 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 NS_E_DRM_MUST_REGISTER as the first specific result. The object and operation attached to NS_E_DRM_MUST_REGISTER are usually more diagnostic than a later cleanup or user-interface summary.
Values to compare
| Field | Value for NS_E_DRM_MUST_REGISTER |
|---|---|
| Temporal state | trusted/system time, validity interval, request sequence and retry number when they influence NS_E_DRM_MUST_REGISTER |
| Lower result | the earliest store, network, cryptographic, driver or provider status preceding the final NS_E_DRM_MUST_REGISTER wrapper |
| Owner | operation, API/callback, object or session identifier, and component/device version associated with NS_E_DRM_MUST_REGISTER |
| 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 NS_E_DRM_MUST_REGISTER |
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. For NS_E_DRM_MUST_REGISTER, 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
NS_E_DRM_MUST_REGISTERis 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
NS_E_DRM_MUST_REGISTER; that bypasses the decision instead of correcting its input. - Retain one failing artifact and one corrected artifact so the resolution of
NS_E_DRM_MUST_REGISTERcan be regression-tested.
Completion criterion
For the final NS_E_DRM_MUST_REGISTER test, keep the content KID or file hash, requested action, user/account, device identity and output route unchanged wherever they apply. The NS_E_DRM_MUST_REGISTER case is resolved only when the operation completes without this HRESULT and without a substitute failure from a neighboring license, trust, session or policy check.
Technical references for NS_E_DRM_MUST_REGISTER
- Windows Media DRM 10 for Network Devices — documents the protocol or API boundary behind NS_E_DRM_MUST_REGISTER.
- Device registration — provides the normative workflow relevant to NS_E_DRM_MUST_REGISTER.
- Using the WMDRM-ND protocol — lists the security and state transitions used to interpret NS_E_DRM_MUST_REGISTER.
- MS-DRMND protocol specification — defines the platform objects used when diagnosing NS_E_DRM_MUST_REGISTER.
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