What is HDCP?

HDCP (High-Bandwidth Digital Content Protection) is a digital rights management technique that is employed to shield HD (high definition) content from unauthorized copying. Several newer displays are HDCP-compliant, which means they can show DVDs that include HDCP content material.

Higher-bandwidth Digital Content material Protection (HDCP), is a kind of digital copy protection developed by Intel Corporation to prevent copying of digital audio and video content as it travels across connections. Varieties of connections incorporate DisplayPort (DP), Digital Visual Interface (DVI), and High-Definition Multimedia Interface (HDMI), as effectively as much less common, or now defunct, protocols like Gigabit Video Interface (GVIF) and Unified Show Interface (UDI).


The method is meant to stop HDCP-encrypted content material from getting played on unauthorized devices or devices which have been modified to copy HDCP content material. Just before sending information, a transmitting device checks that the receiver is authorized to get it. If so, the transmitter encrypts the information to avoid eavesdropping as it flows to the receiver.

HDCP stands for Higher-Bandwidth Digital Content material Protection, a copy protection scheme to remove the possibility of intercepting digital data midstream amongst the source to the display.  The format made by Intel and licensed by Digital Content material Protection, LLC making use of an authentication and essential exchange procedure just before video and audio is presented.  Items compatible with the HDCP scheme such as DVD players, satellite and cable HDTV set-leading-boxes, as effectively as few entertainment PCs calls for a secure connection to a compliant display, the method frequently described as the handshake.  Due to the enhance in companies employing HDCP in their gear, it is hugely suggested that any HDTV you purchase is compatible.  Despite the fact that most video devices help high-definition video more than component output, analog connections are scheduled to phase out in the future or possibly forced to limited resolutions output.


All authorized devices are offered a set of special secret device keys from the Digital Content material Protection LLC, which is the organization that licenses technologies for digital content protection. Throughout the authentication method, the receiver have to demonstrate its expertise of the secret device keys just before content is sent. Right after the receiver acknowledges the keys, each devices create a shared secret value that is created to stop eavesdroppers from stealing the content. Following authentication, the content is encrypted and sent to the receiver that decrypts it. If the Digital Content material Protection LLC determines that a set of secret device keys has been compromised, it places the keys on a revocation list and gives the authorized devices with a new set of keys, which is referred to as renewability. In the course of authentication, the transmitter checks the revocation list just before sending any content.

An HDCP session will result in the exchange of keys amongst the source and display device.  The supply device will query the display to make certain that the gear is HDCP compliant ahead of video is shown.  Non-HDCP devices such as PC’s and older model DVI goods will operate with any DVI compliant show, but the HDCP compliant boxes will show an image only on HDCP compliant show.

Other items affected by HDCP are scalers, switchers, and splitters (distribution amps).  Although these devices do no authentication for essential exchange, they have to be in a position to transmit the presence of HDCP if the video is handled (processed) in any way.  Due to the two various formats of digital connections, occasional inability for correct communications may result in loss of interoperability.  The newer format, HDMI was made to be backwards compatible with DVI and in most instances, the two signal sorts are effortlessly adaptable, but older devices may possibly not always function properly with in-line devices like scalers or switchers.  These difficulties can occasionally be fixed in “firmware’ even though that is not often the case.  Incompatibility is frequently displays on-screen as a snowy image or an error message.

Numerous video and audio playing devices have the HDCP specification in them. Although not all computer systems are HDCP compatible, some computer producers have turned to HDCP to ensure further protective measures are in place. Computers fitted with Windows® Vista®, for instance, normally have the HDCP specification. The HDCP spec can be located in some digital video interfaces (DVIs) — a video interface standard found in display devices such as flat panel LCDs. HDCP can also be identified in many monitors, game consoles, blue-ray players that have high-definition multimedia interfaces (HDMIs) as nicely as monitors and home theater systems that have DisplayPort interfaces.