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Instruction Manual – HDMI-UTPRO-0808
Five Steps in Content Protection Process
1.
The HDMI UTPro uses an authentication protocol to verify that the display device is licensed to receive the content.
2. The transmitter on the source device uses authentication protocol to verify that the HDMI UTPro matrix switching
input (RX) and any routed downstream sinks are licensed to receive the content.
3. The content is encrypted and transmitted.
4. The source device’s transmitter periodically verifies that the HDMI UTPro input is still synchronized and capable
of decrypting the protected content.
5. The HDMI UTPro periodically verifies that the display device(s) is still synced and capable of decrypting the
protected content.
Note: If the source does not support HDCP, the display device does not need to support HDCP. The
unencrypted content from the source is simply routed through the output(s) to the display device(s).
Unsuccessful Transmission in System
Note: Be sure the destination devices support the resolution of the source device.
If an HDMI-UTPRO-0808 system does not successfully transmit the protected content to any of the routed sinks, it may
indicate one of the following conditions:
Invalid key – The HDMI-UTPRO-0808 enclosure’s output connector detected an invalid authentication key
on the destination device.
Non-compliant device – The sink device is not HDCP compliant or has had its authentication key revoked.*
Source sink support limit exceeded – The source device has been routed to more sinks (display devices and/or
repeaters) than it can support.
HDMI-UTPRO-0808 HDMI input sink support limit exceeded – The input is actively routed to more than
16 downstream sinks (display devices and/or repeaters).
* Key revocation is handled strictly by the source device. The HDMI-UTPRO-0808 does not take any action with
respect to revoked keys.
Supported Number of Sinks
HDCP source devices and the HDMI UTPro inputs each support a specific maximum number of sinks.
HDCP Source Device
Each source has a specific number of sinks (repeaters and/or destination devices) that it can support in addition to the
first downstream repeater (which may or may not be an HDMI-UTPRO-0808 enclosure). The number of sinks the
source supports downstream of the first repeater is determined by the source’s manufacturer.
HDMI-UTPRO-0808
Each input on the HDMI-UTPRO-0808 enclosure supports a maximum of 16 downstream sinks (repeaters and/or
destination devices). The HDMI-UTPRO-0808 enclosure, which functions as a repeater, may or may not be the first
repeater in the system. The HDMI-UTPRO-RX Receiver does not
count as a sink.
Once a source is routed through the HDMI-UTPRO-0808 enclosure to a sink, that sink’s key is added to the input’s sink
key cache (list of supported sinks) and remains in the cache even if the sink is disconnected.
One Sink Too Many
Tip: We recommend keeping track of the number of sinks (repeaters and destinations) in a system to avoid
the problem of having one too many.
If you attempt to route the source to an additional sink past its limit or the HDMI UTPro input’s limit of 16 (whichever
occurs first), the protected content will not be transmitted to any of the routed sinks.
Having one sink too many can occur in two different cases (the solution for each is also different).
If a source supports less than 16 sinks downstream from the HDMI UTPro and an additional sink past the
source’s limit is added anywhere in the system, the protected content stops transmitting. Removing a repeater
between the source and the HDMI UTPro enclosure will restore transmission of protected content.
Disconnecting a sink downstream from the HDMI UTPro enclosure, will not restore the transmission of
protected content because the disconnected sink’s key is still in the input’s sink key cache. The cache needs to
be cleared and the cleared state needs to be persisted (if the cache was previously persisted) so authentication
can be completed again (for cache information, see page 68).