The makers of HDCP chips burn the KSVs and Private Device Keys into each piece of silicon.
These keys are highly condential, and protecting them from being compromised is an
essential aspect of the manufacturing process.
Manufacturers are responsible for prohibiting access to the keys, and this involves
maintaining tight control over keys, down to the factory oor. One method to simplify
the task of protecting keys is to use a third-party solution, such as Certicom KeyInject*, to
securely transport and inject keys into silicon during the manufacturing process.
Revocation
Any security system needs to anticipate the possibility that keys could be compromised
and then used to make unauthorized copies of content. To protect against this, the HDCP
specication and license agreement include a mechanism for revoking products’ unique KSVs.
Once a KSV has been revoked, a receiver with that KSV can no longer receive HDCP content.
Sources check the receiver’s KSV during authentication to determine whether it has been
revoked. Lists of revoked KSVs are typically delivered with audiovisual content on media such
as DVDs. A source checks the receiver’s KSV against this list.
The HDCP License Agreement sets forth the conditions under which keys may be revoked. An
Adopter has the ability to dispute revocation and the mechanisms for such a dispute are set
forth in the HDCP License Agreement.
To accommodate emerging high-speed home networking technologies, DCP has begun
evaluating and approving Approved Retransmission Technology (ART) that it deems suciently
meet security requirements for the transmission of protected content.
Examples of ARTs include proprietary wireless technologies that enable consumers to connect
parts of a home theater system together without using cables. These ARTs typically consist of
two parts which are considered to comprise a single product and must be used together: a
wireless transmitter that plugs into the HDMI port on a transmitting HDCP-compliant device
such as a source, and a paired wireless receiver that plugs into the HDMI port on a receiving
device such as a display (sink). The ART receives HDCP-encrypted data output via the HDMI
port, decrypts it, transmits it wirelessly using a proprietary encryption mechanism, and re-
encrypts it using HDCP at the receiving end.
It is important to distinguish ARTs from HDCP approved outputs. Upstream content protection
systems, such as other content protection technologies and DRMs, allow content to be
transmitted in digital form only on specic HDCP-approved outputs, such as HDMI interfaces.
An ART, though considered secure, is not an approved output. However, it is important to note
Approved Retransmission
Technology (ART)
8
(16 strony)
Manymanuals.com
Manymanuals.de
Manymanuals.fr
Manymanuals.it
Manymanuals.pl
Manymanuals.cz
Manymanuals.es
Manymanuals-pt.com
Komentarze do niniejszej Instrukcji