Microsoft recently rolled out its September 2025 Patch update with a KB5065426 code for Windows 11 24H2. However, the patch reportedly produces a very specific bug that prevents some Digital TV and BluRay/DVD applications from playing video. As these applications utilize Enhanced Video Renderer (EVR) with HDCP enforcement or Digital Rights Management (DRM) for digital audio, they may experience various errors, including copyright protection issues, frequent playback interruptions, freezing or black screens, or no video playback at all. Microsoft confirmed the issue on September 19 and is actively working on the fix, which it will roll out in future Windows updates. Microsoft claims that this issue doesn't impact streaming services.

The Enhanced Video Renderer, although still used by some players, has largely been superseded by newer renderers, such as the Simple Video Renderer. Its job in protected playback is to work with Media Foundation and older DirectShow components so decoded frames remain within a trusted rendering path. EVR ensures video is composited only onto Direct3D surfaces that the system treats as secure, preventing decrypted frames from being written to ordinary memory or captured by other software. That coordinated handoff between the media framework, drivers, and the GPU is what lets Windows meet the licensing and output restrictions required for BluRay, broadcast TV, and other DRM-protected formats.HDCP and DRM live between the app and the display or audio hardware to prevent unauthorized copying and playback. HDCP is a link-level protocol that runs a cryptographic handshake over HDMI or DisplayPort, allowing the source and sink to verify that they are both authorized to view the content. DRM systems, such as PlayReady, Widevine, or AACS, encrypt the media and control licenses, expiration dates, and output rules. On Windows the media framework and drivers create a protected rendering path so decrypted frames are never exposed to ordinary memory or to capture tools. If any part of that chain fails, the player will often refuse to render the content rather than risk exposing protected material. That is by design: the systems fail closed to protect copyright. Until Microsoft publishes a fix, users can check Windows Update for hotfixes. If problems began right after KB5065426 was installed, make a restore point and consider uninstalling the update or rolling back a driver temporarily.