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NS_E_DRM_MUST_REVALIDATE
Meaning in the active workflow
The first actionable fact in NS_E_DRM_MUST_REVALIDATE is that the receiver registration exists but its proximity validation is stale or no longer acceptable. Diagnosis of this result therefore starts in WMDRM for Network Devices, the layer responsible for 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.
The strongest confirmation is to record last-validation time and validation-status flags.
Preserve the original generation
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.
This evidence matters because the rejected condition is specifically that the receiver registration exists but its proximity validation is stale or no longer acceptable.
Failure model
The before/after comparison for it has one controlled variable. Before correction, the receiver registration exists but its proximity validation is stale or no longer acceptable; after correction, the same workflow can perform a new proximity-detection exchange before opening content. The result comparison should preserve content and device identity so success cannot be attributed to testing a different asset.
Diagnostic checklist
| 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 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 | record last-validation time and validation-status flags |
Confirm the boundary
- Preserve it and
0xC00D28A7before cleanup, fallback or another media item changes the context. - Apply the narrow correction for it: perform a new proximity-detection exchange before opening content.
- Associate it with its current WMDRM for Network Devices object and the requested action.
- Run the direct check for it: record last-validation time and validation-status flags.
- Compare the failure with a known-good case that changes only the property named by this condition: the receiver registration exists but its proximity validation is stale or no longer acceptable.
- Repeat the same action with the same content/device identity and verify that it is not replaced by another policy or trust failure.
What remains unknown
The established fact is that the receiver registration exists but its proximity validation is stale or no longer acceptable. 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.
Compare neighboring states
| Result | Why it points elsewhere |
|---|---|
NS_E_DRM_MUST_REGISTER | the receiver has no valid entry in the transmitter registration database |
NS_E_DRM_MUST_APPROVE | the receiver is registered but lacks the user approval required before content transfer |
NS_E_DRM_INVALID_PROXIMITY_RESPONSE | the receiver returned a proximity response that fails parsing or cryptographic verification |
Operational response
Repair the owner of the check: perform a new proximity-detection exchange before opening content. 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.
Confirm the same workflow
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 — defines the platform objects used when diagnosing it.
- Device registration — documents the protocol or API boundary behind it.
- Using the WMDRM-ND protocol — provides the normative workflow relevant to it.
- MS-DRMND protocol specification — lists the security and state transitions used to interpret it.
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