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NS_E_WMP_DRM_INVALID_SIG
Read the code before the dialog
The producer of 0xC00D11D7 has determined that a required DRM component or protected object fails signature validation in the Player path. NS_E_WMP_DRM_INVALID_SIG comes from Windows Media Player rights processing, whose state machine implements the Player layer that opens protected media, queries the local license state, performs silent or interactive rights acquisition, validates DRM components and applies play, burn or sync restrictions.
Use the failing operation itself to record the signed file/object hash, signer chain and first trust error.
Correlate the owner and the policy
The security decision represented by this result depends on content KID and header, license-store entry, requested action, acquisition URL, user/store context, secure clock and DRM component generation. Record the content KID, requested action, license-state query, acquisition callback sequence, server response category and the first lower-level DRM HRESULT from the same it attempt.
The scope stays narrow: a required DRM component or protected object fails signature validation in the Player path. Other content or actions may still be valid.
Why the first HRESULT matters
When documenting this result, state the rejected input and the expected successor state. The rejected input is demonstrated when you record the signed file/object hash, signer chain and first trust error; the successor becomes reachable after you restore the authentic signed component or reacquire the signed rights object from its source. Use a known-good counterpart only as a control; do not replace the failing artifact before its identifiers and hashes are recorded.
Minimum evidence set
| Field | Value |
|---|---|
| Temporal state | trusted/system time, validity interval, request sequence and retry number when they influence this result |
| 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 the signed file/object hash, signer chain and first trust error |
| Policy input | requested action plus the exact license, certificate, profile, output or registration property evaluated by it |
Contrast with related results
| Result | Why it points elsewhere |
|---|---|
NS_E_WMP_LICENSE_RESTRICTS | the content license explicitly prohibits the selected Player action |
NS_E_WMP_DRM_NEW_HARDWARE | machine binding changed enough that previously stored rights no longer validate against the current hardware identity |
NS_E_WMP_DRM_CANNOT_RESTORE | the Player restore service rejected another restore within its rate or policy limit |
The final dialog can be broader
The established fact is that a required DRM component or protected object fails signature validation in the Player path. 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.
A controlled reproduction
- Preserve it and
0xC00D11D7before cleanup, fallback or another media item changes the context. - Apply the narrow correction for this HRESULT: restore the authentic signed component or reacquire the signed rights object from its source.
- Associate it with its current Windows Media Player rights processing object and the requested action.
- Run the direct check for this HRESULT: record the signed file/object hash, signer chain and first trust error.
- Compare the failure with a known-good case that changes only the property named by this condition: a required DRM component or protected object fails signature validation in the Player path.
- Repeat the same action with the same content/device identity and verify that it is not replaced by another policy or trust failure.
Recovery at the right layer
Repair the owner of the check: restore the authentic signed component or reacquire the signed rights object from its source. Success means that the same requested action is accepted after that precise state change, not merely that another file or device happens to work.
- A broad reset is not the first step for this HRESULT; Do not reset the local DRM store before recording the content KID and license-state result; a reset can turn a precise rights or signature failure into a generic missing-license condition.
- 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.
Re-test the original case
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 overview — provides the normative workflow relevant to it.
- Acquiring licenses — lists the security and state transitions used to interpret it.
- Licenses and the local license store — defines the platform objects used when diagnosing it.
- Windows Media Format SDK error codes — documents the protocol or API boundary behind it.
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