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• HDCP
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HDMI 1.4 - Content protection (HDCP)
1 High-bandwidth Digital Content Protection (HDCP) is a newer form of
Digital Rights Management. Intel created the original technology to
make sure that digital content followed the guidelines set by the Digital Content Protection group.
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HDMI 1.4 - Content protection (HDCP)
1 HDCP allows for up to 127 devices to be connected, with up to 7 levels,
using a combination of sources, sinks and repeaters
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HDMI 1.4 - Content protection (HDCP)
1 Devices called HDCP strippers can remove the HDCP information from the video signal so the video can
play on non-HDCP-compliant displays, though a fair use and non-
disclosure form must usually be signed with a registering agency
before use.
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High-bandwidth Digital Content Protection - HDCP v2.x
1 This means that HDCPv2 is only applicable to new
technologies
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High-bandwidth Digital Content Protection - HDCP v2.x
1 HDCP 2.x features a new authentication protocol, and a
locality check to ensure the receiver is relatively close (it must respond to the locality check within 20 ms on a normal (DVI/HDMI link ). Version 2.1
of the specification was recently cryptanalyzed and found to have
several flaws, including the ability to recover the session key.
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HDCP
1 'High-bandwidth Digital Content Protection' ('HDCP'), is a form of digital copy protection
developed by Intel|Intel Corporation to prevent copying of digital audio and video content as it travels across connections. Types of connections include DisplayPort
(DP), Digital Visual Interface (DVI), and High-Definition Multimedia Interface (HDMI), as
well as less popular, or now defunct, protocols like Gigabit Video Interface (GVIF)
and Unified Display Interface (UDI).
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HDCP
1 The system is meant to stop HDCP-encrypted content from being played on
unauthorized devices or devices which have been modified to copy HDCP content.HDCP
specification 1.3. Page 31 0x15, Page 35 080509 hddvd-faq.com Before sending
data, a transmitting device checks that the receiver is authorized to receive it. If so, the
transmitter encrypts the data to prevent eavesdropping as it flows to the receiver.
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HDCP
1 For example, the device cannot be designed to copy; it must frustrate
attempts to defeat the content protection requirements; it must not
transmit high definition protected video to non-HDCP receivers; and DVD-Audio material can be played only at Compact
Disc|CD-audio quality by non-HDCP digital audio outputs (analog audio
outputs have no quality limits).
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HDCP
1 [http://www.wired.com/threatlevel/2010/09/intel-threatens-consumers/ Intel Threatens to Sue Anyone Who
Uses HDCP Crack].
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HDCP - Specification
1 Each HDCP-capable device has a unique set of 40 56-bit keys. Failure
to keep them secret violates the license agreement. For each set of values, a special public key called a
Key selection vector|KSV (Key Selection Vector) is created. Each KSV consists of 40 bits (one bit for
each HDCP key), with 20 bits set to 0 and 20 bits set to 1.
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HDCP - Specification
1 Encryption is done by a stream cipher. Each decoded pixel is
encrypted by applying an Exclusive or|XOR operation with a 24-bit
number produced by a generator. The HDCP specifications ensure
constant updating of keys after each encoded frame.
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HDCP - Uses
1 ;Source: The source sends the content to be displayed. Examples
include set-top boxes, DVD, HD DVD and Blu-ray Disc players, and
computer video cards. A source has only an HDCP/HDMI transmitter.
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HDCP - Uses
1 ;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.
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HDCP - Uses
1 Each device may contain one or more HDCP transmitters and/or receivers. (A single transmitter or receiver chip may combine HDCP and HDMI functionality.)(2008, July). HDCP deciphered: white
paper. Retrieved July 22, 2008, from DCP, LLC. Web site: http://www.digital-
cp.com/files/documents/04A897FD-FEF1-0EEE-CDBB649127F79525/
HDCP_deciphered_070808.pdf
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HDCP - Uses
1 HDCP bans compliant products from converting HDCP-restricted content
to full-resolution analog form, presumably in an attempt to reduce
the size of the analog hole.
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HDCP - Uses
1 On January 19, 2005, the European Information, Communications, and Consumer Electronics Technology
Industry Associations (EICTA) announced that HDCP is a required
component of the European HD ready label.
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HDCP - Uses
1 Microsoft Windows Vista and Windows 7 both use HDCP in computer graphics cards and
monitors.[http://www.microsoft.com/whdc/device/media/output_protect.m
spx Output Content Protection and Windows
Vista][http://www.engadget.com/entry/1234000143050582/ The Clicker:
Microsoft's OPM for the masses - Engadget]
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HDCP - Circumvention
1 HDCP strippers remove HDCP information from the video signal in order to allow the data to flow freely to a non-HDCP display. It is currently unclear whether such devices would remain working if the HDCP licensing
body issued key-revocation lists, which may be installed via new
media (e.g. newer Blu-ray Discs) played-back by another device (e.g. a Blu-ray Disc player) connected to
it.
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HDCP - Cryptanalysis
1 The authors concluded that HDCP's linear key exchange is a fundamental
weakness, and discussed ways to:
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HDCP - Cryptanalysis
1 Around the same time, Niels Ferguson independently claimed to have broken the HDCP scheme, but
he did not publish his research, citing legal concerns arising from the controversial Digital Millennium Copyright Act.Niels Ferguson,
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HDCP - Cryptanalysis
1 In November 2011 Professor Tim Güneysu of Ruhr-Universität Bochum revealed he had broken the HDCP 1.3
encryption standard.[http://news.techeye.net/security/intels-hdcp-gets-cracked Intel's HDCP gets cracked - German boffin says encryption flawed | TechEye]
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HDCP - Master key release
1 On September 16, Intel confirmed that the code had been cracked.
[http://www.tomshardware.com/news/hdcp-master-key-copy-
protection,11311.html Intel Confirms That HDCP Master Key is Cracked] Intel has threatened legal action
against anyone producing hardware to circumvent the HDCP, possibly
under the Digital Millennium Copyright Act.
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HDCP - Problems
1 HDCP devices can create multiple keys, allowing each screen to operate, but the number varies from device to device; e.g., a Dish
or Sky satellite receiver can generate 16 keys.http://www.crestron.com/downloads/pdf/misc/third_party_hdc
p_limits.pdf The technology sometimes causes handshaking problems where devices cannot establish a connection, especially
with older high-definition displays.[http://www.popularmechanics.com/blogs/technology_news/4212233.html PS3 Blinking Mystery Deepens—Westinghouse:
Our TVs Not the Problem - Popular Mechanics][http://www.avrev.com/news/1105/10.hdcp.html HDCP
Handshake A Big Problem For Many Legacy DVI-Based HDTVs][http://www.eetimes.com/design/communications-design/4013366
/HDMI-DVI-HDCP-handshake-problems--how-to-avoid-them EETimes | HDMI/DVI HDCP handshake problems how to avoid
them]
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HDCP - Problems
1 Edward Felten wrote the main practical effect of HDCP has been to create one more way in which your electronics could fail to work properly with your TV, and concluded in the aftermath of the master key fiasco
that HDCP has been less a security system than a tool for shaping the consumer
electronics market.[http://www.freedom-to-tinker.com/blog/felten/understanding-hdcp-master-key-leak Understanding the HDCP
Master Key Leak]https://store.theartofservice.com/itil-2011-foundation-complete-certification-kit-fourth-edition-study-guide-ebook-and-online-course.html
HDCP - Problems
1 There is also the problem that all Apple laptop products, presumably to reduce switch
time, when confronted with an HDCP compliant device switches all output from the
DVI / Mini DisplayPort / Thunderbolt connector port to HDCP compliant. This is a problem if you wish to record or use video
conferencing facilities further down the chain, which are inherently forbidden by HDCP. This
applies even if the output is not HDCP material, like a PowerPoint presentation.
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HDCP - HDCP v2.x
1 This means that HDCPv2 is only
applicable to new technologies
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HDCP Repeater bit
1 The 'HDCP repeater bit' is a part of the High-bandwidth Digital
Content Protection specification and applies to intermediate devices (HDCP Repeaters) between the
Source device and the Presentation device. For example a Blu-ray connected by HDMI to an AV
Receiver which in turn connected to a TV using HDMI makes the AV
Receiver an HDCP Repeater.https://store.theartofservice.com/itil-2011-foundation-complete-certification-kit-fourth-edition-study-guide-ebook-and-online-course.html
HDCP Repeater bit - Details
1 In order to avoid this redundant reset cycles on the connections, which has annoying user-experience, HDCP v1.x
allows devices that are potentially Repeater to set the REPEATER all the
time, even when no downstream devices are connected (e.g
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HDCP Repeater bit - Details
1 In HDCP v2.x that smart has been lost and the Repeater must not keep the REPEATER flag set once it has no
downstream devices.
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HDCP Repeater bit - Details
1 HDCP Repeater. An HDCP device that can receive and decrypt HDCP content through one or more of its HDCP-protected interface ports, and can also re-encrypt and emit said
HDCP content through one or more of its HDCP-protected interface ports, is referred to as an HDCP repeater. An HDCP repeater may also be referred to as either an HDCP receiver
or an HDCP transmitter when referring to either the upstream side or the downstream
side, respectively.
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HDCP Repeater bit - Issues with REPEATER
1 Some HDCPv1.x devices (usually old) may not agree to work with Repeater
that has REPEATER=TRUE but not downstream devices (DEVICE_COUNT=0).
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DVB-CPCM - HDCP and DTCP-IP
1 High-bandwidth Digital Content Protection|HDCP protects a single wire connection, typically Digital
Visual Interface|DVI or High-Definition Multimedia Interface|HDMI.
CPCM is network independent and can be used on LAN, WiFi, and in
theory even on IEEE 1394 Firewire links.
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DVB-CPCM - HDCP and DTCP-IP
1 DTCP-IP is a link protection system similar to HDCP, but operates over a LAN or WLAN
connection.
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DVB-CPCM - HDCP and DTCP-IP
1 Both HDCP and DTCP-IP are link protection render and toss
technologies that generally prohibit the receiving device from recording or redistributing the content. Also,
both are designed to prevent connection of devices that are not in close proximity to one another. CPCM
by contrast can allow for recording and/or remote access depending on the specific rights granted with the
content.
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