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HDCP
What is HDCP and how should you troubleshoot it?
High-bandwidth Digital Content Protection (HDCP) is a specification developed by the Intel®
Corporation to protect digital entertainment content that uses a digital visual interface (DVI).
HDCP encrypts the transmission of digital content (signal) between the video source (computer,
DVD player, or set-top box) and the digital display (monitor, digital television/DTV, or projector).
HDCP is not designed to prevent copying or recording of digital content, but only to protect the
integrity of the content as transmitted.
You see “noise” or “trash” on the screen.
• When your display’s digital capabilities exceed a digital broadcast signal, the signal is
increased (up-converted) to match the display capabilities. Up-converting can cause “noise”
or “trash.” The signal on DVI-D is HDCP encoded. Stop and restart the source to allow
renegotiation.
How HDCP works.
• Implementation of HDCP requires a license obtainable from the Digital Content Protection,
LLC, which then issues a set of unique secret device keys to all authorized devices. During
authentication, the receiving device only accepts content after it acknowledges the keys. To
further prevent stealing of the data or line tapping, the transmitter and receiver generate
a shared secret value that is constantly checked throughout the transmission. After
authentication is established, the transmitter encrypts the data and sends it to the receiver
for decryption.
You lose the signal to the display while watching a movie on a HDCP-equipped component.
• The component must be restarted to establish renegotiation.
For example, while watching a movie on a HDCP-enabled DVD player, you change the
receiving device (DTV, monitor, or projector) input to watch broadcast TV, then change the
input back to watch the DVD movie. However, you are unable to watch the movie. This is
because when the input was changed, the receiver lost the HDCP signal. Restart the
HDCP-enabled DVD player to allow renegotiation.
A movie starts, but then slowly fades to static.
• The receiving device is not HDCP compatible or it is not negotiating correctly. Restart the
video source and re-plug all video cables from the source to the TV.
How to determine whether a component is HDCP compliant.
• If the video source device does not have a DVI or HDMI connection, it is not HDCP compliant.
DCDi by Faroudja
What is DCDi by Faroudja?
DCDi
®
by Faroudja is a video mode algorithm that stands for Directional Correlation De-Interlacing.
It was initially designed for fast-action video-based material. Its general purpose is to reduce
jagged edges along diagonal lines caused by interpolation. Utilizing this algorithm, DCDi does not
simply weave together two fields of video that match. DCDi creates new information through
interpolation which “smooths” the diagonal edges. DCDi constantly monitors edge transitions and
fills in any of the gaps that need smoothing.