consumer electronics devices. HDMI delivers high-denition video and multi-channel audio
over a single cable using standard connectors.
HDCP may also be employed over several other digital interfaces, which currently are Digital
Visual Interface (DVI), DisplayPort, GVIF (Gigabit Video Interface), DLI (Digital Light Interface),
and UDI (Unied Display Interface).
Content protection vs DRM
It’s important to note a key dierence between HDCP and other content protection or rights
management technologies. Content providers typically use a Digital Rights Management
system (DRM) to protect their content. DRMs are designed to prevent unauthorized uses of the
content and to permit other uses or impose other restrictions on such content. For example,
a consumer may download a le containing music or video to a digital player. This content is
protected by a DRM that controls what a user can do with that content. The DRM may control
whether the user can make copies of the le or play the content on other types of devices, for
example. HDCP is not a DRM. It performs a very specic role: to encrypt and protect content as
it is transmitted as a stream of digital data for display.
HDCP in detail
Types of HDCP devices
HDCP-protected systems may include three types of devices: sources, sinks and repeaters.
HDCP protects data as it is transmitted between each of these devices when they are
connected via HDMI or other HDCP-protected digital interfaces.
Each device contains one or more HDCP transmitters or receivers, or it may contain both
receivers and transmitters. Sometimes HDCP and HDMI functionality are combined into a single
transmitter or receiver chip.
Source: The source sends the content to be displayed. Examples include set-top boxes, DVD
and Blu-Ray players, and computer video cards. A source has only an HDCP/HDMI transmitter.
Sink: The sink renders the content for display so it can be viewed. Examples include TVs and
digital projectors. A sink has one or more HDCP/HDMI receivers.
Repeater: A repeater accepts content, decrypts it, then re-encrypts and retransmits the data.
It may perform some signal processing, such as upconverting video into a higher-resolution
format, or splitting out the audio portion of the signal. Repeaters have both HDMI inputs and
outputs. Examples include home theater audio-visual receivers that separate and amplify the
audio signal, while re-transmitting the video for display on a TV. A repeater could also simply
send the input data stream to multiple outputs for simultaneous display on several screens.
What HDCP is not:
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