What is an HDCP error on Apple TV and why does it occur?

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Grade: Education Subject: Support
What is an HDCP error on Apple TV and why does it occur?
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HDCP (High-bandwidth Digital Content Protection) is a form of digital copy protection. An HDCP error on Apple TV means the device is having trouble verifying the HDCP handshake with a connected device (like a TV or receiver). This often happens due to incompatible HDCP versions, faulty cables, or outdated firmware on either the Apple TV or the connected device.