CP TECHNOLOGIES 4 CH Digital Video System Manual de usuario descargar pdf (Pagina 8)

receiver sends information to the transmitter, and the transmitter uses this information to

verify that the devices are synchronized and that the receiver is receiving and accurately

decrypting the content.

Encryption

After authentication, the transmitter uses its HDCP cipher engine and the shared session key to

create a stream of encrypted data that can only be decrypted by the receiver. The receiver uses

its HDCP cipher engine and its copy of the session key to decrypt the content.

HDCP licensing and use

Manufacturers who choose to use HDCP need to license it from DCP. By doing so, they agree

to comply with the HDCP License Agreement and accordingly, make their products compliant

with the HDCP specication and compliance rules and relevant interfaces such as HDMI, and to

meet interoperability requirements.

Licensed technology Adopters are required to meet content protection requirements. For

example, the HDCP License Agreement prohibits high-denition digital video sources from

transmitting protected content to non-HDCP enabled receivers, and such devices from making

copies of decrypted content. Adopters agree to store highly condential information securely

and robustly, and to design products that meet industry standards to eectively frustrate

attempts to defeat the content protection, including attempts to obtain highly condential

information such as device keys.

Key provisioning

Typically, consumer electronics manufacturers incorporate HDCP into their products by

buying HDCP chips from a DCP-licensed vendor. These chips already contain the keys.

3. Information is sent to transmitter

every two seconds during entire HDCP

session to ensure encryption is in sync

between all transmitter/receiver pairs

in the tree

Receiver

Transmitter

Authentication

1. Keys exchanged

2. If receiver is a repeater, data about

downstream devices is sent to

transmitter

Figure 4.

HDCP Authentication Process

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CP TECHNOLOGIES 4 CH Digital Video System Manual de usuario Pagina 8