What is HDCP?

HDCP is the abbreviation of High-bandwidth Digital Content Protection. Chinese can be called "High-bandwidth Digital Content Protection". HDCP technology was developed by Hollywood and the semiconductor giant Intel in cooperation, and it is applied between the transmission and reception ends of video and audio signals, such as graphics cards, DVD players, etc., and the reception ends such as monitors, televisions, projectors, etc. Wait. It is an important anti-piracy technology for high-definition movies and TV programs. Monitors that do not support the HDCP protocol cannot normally play copyrighted high-definition programs.

HDCP technology

HDCP technology is developed by Hollywood and semiconductor giants

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Decoding is only one third of the system, and the other third is bound to be stuck in the neck by HDCP. To solve this problem, the graphics cards corresponding to HDCP need to be equipped with control chips from Silicon Image and TI. In general, HDCP-supported graphics cards need to meet 4 conditions: the EEPROM size of the graphics card can be adjusted; the EEPROM content can be rewritten; the GPU supports instant video

1. Fragile line of defense-

Everyone knows the benefits of HDMI (High Definition Multimedia) digital transmission, but what is HDCP (High-Bandwidth Digital Content Protection) certification for graphics cards? Not many people believe in deep understanding. Therefore, I want to make a brief introduction to these two parts, so that everyone can charge more for high-quality technical knowledge.

The HDMI interface can provide data transmission bandwidth up to 5Gbps, which can transmit uncompressed audio signals and high-resolution video signals. At the same time, there is no need to perform digital-to-analog or analog-to-digital conversion before signal transmission, which can ensure the highest quality video and audio signal transmission. The advantage of applying HDMI is that only one HDMI cable is needed to transmit audio and video signals at the same time, unlike today, which requires multiple cables to connect.

In fact, there are currently six different versions of HDMI. The main impact is on equipment rather than cables! So when you buy the wire as long as the precision is high enough and the quality is good enough, no matter how the version changes, the wire can still be used. However, because the bandwidth of the 1.3 version has become higher, the distance that can be transmitted is relatively shortened compared to the past, and the current certified line is only up to 6.5 meters.

HDMI can be fully backward compatible. If your device has a built-in version 1.3 HDMI terminal (such as Sony's PS3 game console), it can communicate with devices with built-in 1.2, 1.1, and 1.0 version terminals! Of course, it is best to have the best 1.3 version on both sides, so that you can have 10BIT or higher format video signal quality performance instead of reducing to 8BIT.

After understanding HDMI, let's look back at your graphics card. Does it support the HDMI terminal? Or the DVI-D terminal to convert into an HDMI terminal to the corresponding display? Most of the latest graphics cards have HDCP certification, but what is HDCP? Its main purpose is a protection mechanism to prevent high-resolution digital signals from being stolen. When both machines must have HDCP authentication, the signals can be transmitted.

The way it works is that when the DVD is connected to the projector via an HDMI terminal cable, the DVD will send a set of HDCP authentication codes to authenticate the projector. After confirmation, the projector can play the video signal normally. However, if there is no certification, the image will show a fixed time, there is no picture, or there is a phenomenon of flickering.

The HDCP authentication is confirmed through the 15Pin and 16Pin pins of HDMI. After the two parties have completed the authentication, these two pins have not stopped! It will confirm again every two seconds! So if you want to steal the machine, don't think that after you have the signal, you can change to a device that can be burned (pirated) to crack the authentication problem!

But is it impossible to burn video as long as it has HDCP certification? Rest assured, as long as it is a 480-level video signal! Because HDCP only protects high-resolution signals (above 480 levels). So if you are transmitting a normal DVD movie, it is not limited.

After a brief and concise explanation, I hope everyone has a better understanding of HDMI and HDCP. Many motherboards will have built-in HDMI terminals. This is a trend and trend. No matter if it is used or not, it is better than nothing. Are you right? Whenever you change the screen of the HDMI terminal, you can connect the sound and the picture at the same time, and as long as there is only one line, is it convenient?