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| MF_E_WMDRMOTA_DRM_HEADER_NOT_AVAILABLE | MF_E_WMDRMOTA_ACTION_MISMATCH |
MF_E_WMDRMOTA_DRM_ENCRYPTION_SCHEME_NOT_SUPPORTED
MF_E_WMDRMOTA_DRM_ENCRYPTION_SCHEME_NOT_SUPPORTED is a protection-system compatibility error. The protected stream's WMDRM configuration identifies an encryption scheme that the current output trust authority cannot handle.
Compare protection capabilities, not codec capabilities
- Record the protection-system and stream context before the policy call.
- Identify the trusted output and OTA action selected for the stream.
- Compare with a protected asset using a supported scheme on the same machine and output path.
Media Foundation's PMP can host different content-protection mechanisms, and the ITA/OTA contract separates input protection from output enforcement. A decoder can accept the compressed media type while the protected path still rejects the encryption scheme. Do not translate this HRESULT into “unsupported video format.” The actionable question is whether the source protection system, decryption path, and WMDRM OTA support a compatible protection scheme for the requested action.
Microsoft: extensible content protection in PMP · Microsoft: ITA and decrypter role · Microsoft: OTA protection systems
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