Not all DVI jacks are HDCP compliant. All HDMI jacks, however, are HDCP compliant.
What Is High-Bandwidth Digital Content Protection System (HDCP)?
HDCP (High-Bandwidth Digital Content Protection) is a specification developed by Intel Corporation to protect digital content passed between DVI (Digital Video Interface) compliant video transmitters (computers, for example) and DVI compliant video receivers (monitors, televisions, etc.). In the past three years, the HDCP specification has been extended to HDMI compliant equipment such as TVs. Before transmitting digital content, the transmitter transmits special HDCP device keys to the video receiver which only accepts content if it receives the correct keys. After the receiver has received the device keys, the transmitter and receiver generate another value that is transmitted and constantly checked as the digital content is transmitted to verify the transmission. To further protect the transmission, the transmitter encrypts the data before it sends it.
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