HDCP is an abbreviation for High-bandwidth Digital Content Protection. Chinese may be referred to as "HDCP digital content protection." HDCP technology is developed by Hollywood and semiconductor giant Intel. It can be practically used in the transmission end of graphics cards, DVD players, and the receiving end of monitors, televisions, and projectors. It is an important anti-piracy technology for high-definition movies and television programs. Displays that do not support the HDCP protocol cannot properly play copyrighted HD programs.
High-definition movie programs after DVD use HDCP and AACS anti-piracy technology. Both Blu-ray and HD DVD use this anti-piracy technology. High-definition television (HDTV) will also be used. After HDCP and AACS anti-piracy technologies are used, movie programs can only play normally on devices that support HDCP. Otherwise, they can only see a black screen or a low-quality display (the resolution is only about a quarter of normal). Lost the value of HD. Among them, AACS is an encryption technology. It is also used in HD DVD and Blu-ray Discs. The video content in the protected disc cannot be duplicated and played in other places.
The HDCP protocol is used to prevent video content from being completely copied during transmission. This technology does not allow digital signals to be recorded illegally. Instead, it encrypts digital signals so that illegal recording methods cannot achieve the original high-resolution image quality. For example, a Blu-ray disc player cannot record a clear program while playing a high-definition disc. When a disc is played on a computer, the program on the display cannot be clearly recorded. HDCP protects the video signal from beginning to end, that is, every link in the entire playback system must support the HDCP protocol. If the monitor does not support the HDCP protocol, it cannot play high-definition programs normally. Only black screens or low-quality images can be seen. Show. To support the HDCP protocol, digital video interfaces such as DVI and HDMI must be used. The traditional analog interfaces such as VGA cannot support the HDCP protocol. When using an analog signal interface such as VGA, the picture will drop to a low picture quality, or the prompt will not be played, thereby losing the meaning of high definition and preventing piracy. It should be noted that the HDMI interface is embedded with the HDCP protocol, and the display with the HDMI interface supports the HDCP protocol. However, LCD monitors with DVI interfaces do not support the HDCP protocol. They must pass through a certified monitor with appropriate hardware chips.
The data content protected by the HDCP technology on the computer platform will be driven by the COPP in the operating system (certified output protection protocol) at the time of output to first verify the video card, only the legal video card can realize the content output, and then the key of the display device is authenticated. Only HDCP-compliant devices can ultimately display the content of the video card. During the transmission of HDCP, both the sender and the receiver store a set of available keys. These keys are secretly stored. Both the sender and the receiver perform encryption and decryption operations based on the key. Such operations must also include a special key. Value KSV (video encryption key). At the same time, each device of the HDCP will have a unique KSV sequence number, and the cryptographic processing unit of the sending end and the receiving end will check the other party's KSV value to ensure that the connection is legitimate. The encryption process of HDCP will process each pixel, making the picture become irregular and unrecognizable. Only the sender and receiver that confirm the synchronization can perform reverse processing and complete data restoration. During the decryption process, the HDCP system will perform a connection confirmation every 2 seconds, and simultaneously perform a synchronization identifier of the sender and the receiver every 128 frames to ensure synchronization of the connection. In order to deal with the situation of key leakage, HDCP established a "revocation key" mechanism. The key set KSV value of each device is unique, and the HDCP system will compare and find the KSV value in the revocation list after receiving the KSV value. The KSV appearing in the list will be regarded as illegal, resulting in the failure of the authentication process. The list of revocation keys here will be included in the multimedia data corresponding to the HDCP and will be automatically updated.
It can be seen that if you want to play copyrighted high-definition programs on your computer, whether it is HDTV, Blu-ray, or HD DVD discs, the display and graphics card are required to support the HDCP protocol. However, manufacturers must provide HDCP Logo for the product, you need to pay a certain certification fee, but also increase the hardware chip, obviously increase the cost, only some products are currently certified. As high-definition programs will become more common, HDCP is a foregone conclusion, and more devices will support the HDCP protocol.
High-definition movie programs after DVD use HDCP and AACS anti-piracy technology. Both Blu-ray and HD DVD use this anti-piracy technology. High-definition television (HDTV) will also be used. After HDCP and AACS anti-piracy technologies are used, movie programs can only play normally on devices that support HDCP. Otherwise, they can only see a black screen or a low-quality display (the resolution is only about a quarter of normal). Lost the value of HD. Among them, AACS is an encryption technology. It is also used in HD DVD and Blu-ray Discs. The video content in the protected disc cannot be duplicated and played in other places.
The HDCP protocol is used to prevent video content from being completely copied during transmission. This technology does not allow digital signals to be recorded illegally. Instead, it encrypts digital signals so that illegal recording methods cannot achieve the original high-resolution image quality. For example, a Blu-ray disc player cannot record a clear program while playing a high-definition disc. When a disc is played on a computer, the program on the display cannot be clearly recorded. HDCP protects the video signal from beginning to end, that is, every link in the entire playback system must support the HDCP protocol. If the monitor does not support the HDCP protocol, it cannot play high-definition programs normally. Only black screens or low-quality images can be seen. Show. To support the HDCP protocol, digital video interfaces such as DVI and HDMI must be used. The traditional analog interfaces such as VGA cannot support the HDCP protocol. When using an analog signal interface such as VGA, the picture will drop to a low picture quality, or the prompt will not be played, thereby losing the meaning of high definition and preventing piracy. It should be noted that the HDMI interface is embedded with the HDCP protocol, and the display with the HDMI interface supports the HDCP protocol. However, LCD monitors with DVI interfaces do not support the HDCP protocol. They must pass through a certified monitor with appropriate hardware chips.
The data content protected by the HDCP technology on the computer platform will be driven by the COPP in the operating system (certified output protection protocol) at the time of output to first verify the video card, only the legal video card can realize the content output, and then the key of the display device is authenticated. Only HDCP-compliant devices can ultimately display the content of the video card. During the transmission of HDCP, both the sender and the receiver store a set of available keys. These keys are secretly stored. Both the sender and the receiver perform encryption and decryption operations based on the key. Such operations must also include a special key. Value KSV (video encryption key). At the same time, each device of the HDCP will have a unique KSV sequence number, and the cryptographic processing unit of the sending end and the receiving end will check the other party's KSV value to ensure that the connection is legitimate. The encryption process of HDCP will process each pixel, making the picture become irregular and unrecognizable. Only the sender and receiver that confirm the synchronization can perform reverse processing and complete data restoration. During the decryption process, the HDCP system will perform a connection confirmation every 2 seconds, and simultaneously perform a synchronization identifier of the sender and the receiver every 128 frames to ensure synchronization of the connection. In order to deal with the situation of key leakage, HDCP established a "revocation key" mechanism. The key set KSV value of each device is unique, and the HDCP system will compare and find the KSV value in the revocation list after receiving the KSV value. The KSV appearing in the list will be regarded as illegal, resulting in the failure of the authentication process. The list of revocation keys here will be included in the multimedia data corresponding to the HDCP and will be automatically updated.
It can be seen that if you want to play copyrighted high-definition programs on your computer, whether it is HDTV, Blu-ray, or HD DVD discs, the display and graphics card are required to support the HDCP protocol. However, manufacturers must provide HDCP Logo for the product, you need to pay a certain certification fee, but also increase the hardware chip, obviously increase the cost, only some products are currently certified. As high-definition programs will become more common, HDCP is a foregone conclusion, and more devices will support the HDCP protocol.
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