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The DVI specification is based on the panelLink technology originally developed by Silicon Image DVI quickly gained wide acceptance in the industry due to its low-cost, highspeed digital connection for video displays DVI supports all HDTV resolutions, in fact, it supports up to 1600 1200 (UXGA) resolution and even higher resolutions are possible with dual links DVI exceeds by far the bitrate limitation of contemporary IEEE 1394 implementations IEEE 1394 supports bitrates up to 40 Mbps, which would be enough for most compressed MPEG videos, whereas DVI supports up to 495 Gbps, which is more than enough for high-definition video of all sorts Alas, in its initial configuration, DVI was missing a security component But Intel quickly proposed a solution High-bandwidth Digital Content Protection (HDCP) HDCP can be used with multiple digital video monitor interfaces, such as DVI, HDMI (High Definition Multimedia Interface), and DisplayPort See 7 for more information on HDMI HDCP contains three components authentication with key exchange, encryption, and revocation HDCP ciphers and circuitry are implemented both in transmitters and in receivers, to ensure a secure end-to-end connection Each transmitter (eg, a player or a computer) and each receiver (eg, a display or a recorder) has programmable read-only memory (PROM) circuitry that is used to store secret device-specific keys provided by the HDCP licensing entity The authentication between devices is a cryptographic process verifying that the receiving device is indeed authorized to receive It is not mandatory that manufacturers include HDCP circuitry in their devices Further, because HDCP was introduced after the first DVI-compliant monitors were released, there is a possibility that a device with HDCP could detect that it is connected to a non-HDCPcapable display When this situation occurs, the transmitting device will lower the image quality of the protected content before transmission Each HDCP-compliant device has an array of 40 keys that are 56 bits each and a corresponding 40-bit binary Key-selection Vector (KSV), provided by the HDCP licensing authority The transmitter sends the KSV with a random 64-bit value that initiates the authentication process The receiver returns its own KSV, which is then checked by the transmitter to ensure that the key has not been revoked Both devices individually calculate a shared value from the exchanged data that will be equal if both devices have valid keys Because both ends of the transmission share the same value, it can be used to encrypt the protected data in the transmitter and to decrypt the data in the receiver To ensure that the connection is still secure, a reauthentication occurs every few seconds This avoids scenarios in which an authorized device is unplugged and an unauthorized device is connected instead An unauthorized device will not be able to decrypt the stream and the content will appear as random noise
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Contrary to DVD, where all content protection systems were optional for the producer of the disc, there are mandatory content protection implementations for Blu-ray AACS and BD-ROM Mark Obviously, since BD-ROM Mark contains hidden keys that are necessary for AACS decryption, if one is mandatory both have to be Once the AACS licensing agree-
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ments become finalized it may become mandatory to embed a Verance audio watermark on the disc, as well The other protection schemes described above are optional for the disc producer It is a choice for the producer whether or not BD+ protection is added to a disc, with or without forensic marks As for the transmission protection systems, DTCP and HDCP, the player or computer handles them, not the disc developer
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The Analog Sunset
There are no reliable protection mechanisms for analog transmissions of high-definition video content the so-called analog hole This presents a serious problem since there are many HD-ready displays in the marketplace that do not have digital connection technology These HD-ready devices can only display HD content delivered via analog inputs, which may allow for easier copying of high-definition content Obviously, this is not a satisfying scenario for the Hollywood industry that is trying to protect their high quality content As much as Hollywood would like to dismiss the fact that there are a number of analog HD displays in the market and to simply not release unprotected content into the analog realm, a compromise had to be found in order to avoid dissatified customers As a result, an agreement was instituted that will result in the so-called analog sunset , or termination of non-digital high-definition connectivity This analog sunset takes place in two stages The first stage begins with all products manufactured and sold after December 31, 2010 They will be allowed to only transmit high-definition content through encrypted digital outputs Content that may be passed through analog connections can only be in standard-definition interlace mode, such as, composite, s-video, or 480i component The second stage of this analog sunset requires that products manufactured and sold after December 31, 2013 are not allowed to pass any content through analog outputs In the meantime, the AACS specifications provide mechanisms to control the behavior of the protected content There are two flags that can be applied to disc behavior the Image Constraint Token (ICT) and the Digital Only Token (DOT) The ICT restricts the resolution of the content to be passed through analog outputs to not exceed 520,000 pixels per frame This translates to a resolution of 960 540 pixels for a 16:9 aspect ratio There are no further restrictions on post-processing algorithms, such as scaling, line doubling, or other video processing techniques that can be applied within the display AACS also defines which devices are allowed to pass content through their analog outputs prior to the first sunset date of December 31, 2010, as outlined in Table 41 The other flag, the Digital Only Token, prevents the transmission of decrypted AACS content through analog outputs When the DOT flag is set, only protected digital outputs are allowed to transmit the content Furthermore, digital interfaces are required to be protected by DTCP, HDCP, or by the Windows Media Digital Rights Management (WMDRM) process from Microsoft DOT was not implemented in the AACS interim agreement
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