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VFW_E_COPYPROT_FAILED
Meaning
Windows documents VFW_E_COPYPROT_FAILED as “Copy protection cannot be enabled. Please make sure any other copy protected content is not being shown now”. Here, the DVD playback path cannot enable the required copy-protection mechanism between decoder, renderer and display.
Conditions that can produce it
- Cause 1: another protected playback session occupies a scarce legacy resource.
- Cause 2: decoder and renderer cannot establish the protection handshake.
- Cause 3: display driver or output path does not support the required mechanism.
Relevant contract
Code-specific boundary: VFW_E_COPYPROT_FAILED narrows the investigation to the copy-protection handshake between source, decoder and renderer rather than ordinary media decoding. Preserve the DVD domain, title/menu location and graph topology from the same attempt so a later navigation error is not mistaken for the original condition.
Start with the DVD Navigator, graph builder, decoder inventory and renderer topology.
Evidence worth preserving
- Evidence 1: decoder and renderer identities.
- Evidence 2: protection handshake stage and lower-level status.
- Evidence 3: active protected sessions, connector and driver state.
Correction strategy
- Action 1: close competing protected sessions.
- Action 2: use a compatible certified decoder-renderer-output path.
- Action 3: preserve security diagnostics without bypassing the protection requirement.
Example incident
A second DVD player starts while another application holds the legacy copy-protection channel; closing the first session allows the handshake and clears it.
Retry and recovery
Retry rule: Retry after the competing session ends or the protected output path changes; do not disable protection as a workaround.
How it differs from nearby results
VFW_E_NO_COPP_HW says COPP support is unavailable, while it can describe a failed protection setup even when protection-capable components are present.
Official Microsoft references
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