Video input has been a feature of graphics cards for decades, allowing users to capture and digitize analog video signals from external devices such as VCRs, camcorders, or gaming consoles. However, in recent years, video input has been phased out from most graphics cards due to digital rights management (DRM) concerns.

DRM refers to a set of technologies and protocols used to protect copyrighted content from unauthorized use or distribution. It is commonly used in digital media, such as movies, TV shows, and games, to prevent piracy and copyright infringement. One of the key features of DRM is the ability to enforce copy protection on the playback and distribution of digital content.

Video input on graphics cards poses a potential security risk for content creators and distributors, as it allows users to circumvent copy protection measures by capturing and digitizing protected content. For instance, users can connect a VCR to a graphics card with video input, record a protected movie, and then distribute or share the digital copy online, effectively bypassing the copy protection mechanism.

To prevent this type of piracy and copyright infringement, graphics card manufacturers and content creators have removed video input from their products. By doing so, they ensure that their content remains secure and protected from unauthorized use.

However, this move has not been without controversy. Some users argue that video input is a useful feature for legitimate purposes, such as video editing or live streaming. Moreover, the removal of video input has limited the functionality of graphics cards, reducing their appeal to some users.

In response, some manufacturers have developed external devices that offer video input without compromising DRM. These devices, such as capture cards or HDMI splitters, are designed to comply with DRM standards and prevent piracy while still allowing users to capture and digitize video signals.

In conclusion, video input was removed from graphics cards due to DRM concerns, as it posed a security risk for copyrighted content. While this move has been criticized by some users, it has helped to protect digital content from piracy and copyright infringement, ensuring that content creators and distributors are compensated for their work.