What is HDCP? What is the relationship with HDMI?｜BJCast
HDCP (High Bandwidth Digital Content Protection) is a high bandwidth digital content protection technology primarily used to ensure that digitized image and audio data are not illegally copied when transmitted through high-speed digital video interfaces such as HDMI, DisplayPort, DVI. It ensures the integrity and security of digital content through data encryption and authorization verification.
HDMI (High Definition Multimedia Interface) is a high-definition multimedia interface standard used for transmitting uncompressed audio and video signals. The HDMI interface has the characteristics of high speed, high quality, and high definition, and is widely used in devices such as televisions, projectors, and computer monitors.
The relationship between HDCP and HDMI is very close. The content transmitted over the HDMI interface can be encrypted through HDCP to ensure that only devices decrypted through HDCP can play the content correctly. This makes HDMI a safe and effective solution for high-definition video transmission. In HDMI connection, the transmitting device encrypts the digital audio and video signals and sends them to the receiving device through an HDMI cable. The receiving device receives signals through the HDMI interface and then decrypts the encrypted high-definition content using HDCP. If the receiving device supports HDCP, the signal will be decrypted correctly and played normally; If the receiving device does not support HDCP or HDCP authentication fails, the signal will be prohibited from decryption and cannot be played.
The main functions of HDCP include:
1. Preventing illegal recording: HDCP ensures that high-definition signals transmitted via HDMI or DVI are not illegally recorded through data encryption and authorization verification.
2. Copyright protection: The HDCP technology specification is led by Intel. When users engage in illegal copying, this technology will interfere and reduce the quality of the copied images, thereby protecting the content.
3. Updating capability: When it is necessary to revoke the legitimacy of the receiver, the updating capability of HDCP can identify and cancel unauthorized or KSV devices that have been placed in the “revocation list”, avoiding the illegal theft of copyright information due to the leakage of private device keys and KSVs of legitimate HDCP receivers.
In general, HDCP is a content protection system based on data encryption and authorization verification, mainly used to protect the digital image and sound data transmitted through high-speed digital video interfaces from illegal copying and recording, thereby protecting the copyright of content. HDCP is an encryption technology used on the HDMI interface to protect digital content from illegal copying, and together they form a secure and effective solution for high-definition video transmission.