Abstract: A unified system of programming communication. The system encompasses the prior art (television, radio, broadcast hardcopy, computer communications, etc.) and new user specific mass media. Within the unified system, parallel processing computer systems, each having an input (e.g., 77) controlling a plurality of computers (e.g., 205), generate and output user information at receiver stations. Under broadcast control, local computers (73, 205), combine user information selectively into prior art communications to exhibit personalized mass media programming at video monitors (202), speakers (263), printers (221), etc. At intermediate transmission stations (e.g., cable television stations), signals in network broadcasts and from local inputs (74, 77, 97, 98) cause control processors (71) and computers (73) to selectively automate connection and operation of receivers (53), recorder/players (76), computers (73), generators (82), strippers (81), etc.

Abstract: An apparatus and method for processing content signals received from a plurality of different, and possibly dissimilar, signal sources, such as different satellite networks, and providing a display based on the content of those signals. The apparatus includes a tuner/demodulator for receiving content signals and demodulating the received content signals as programming bitstreams, and one or more access control devices for descrambling any conditional access present in the demodulated programming bitstreams. The apparatus further includes a processor, such as a system chip, which is responsible for all command and control functions. The system chip evaluates conditional access to determine whether the bitstream needs decryption, descrambling, or both, and processes a bitstream from one of the multiple signal sources for display on a suitable output device.

Abstract: A digital television (DTV) signal converter consistent with certain embodiments has a satellite band receiver that receives satellite television broadcast data from a satellite service and demodulates the satellite television broadcast data into a digital data stream. The digital data stream contains television content, satellite television logical channel identification information and electronic program guide data, and wherein television content, the logical channel identification information and the electronic program guide data are associated with a set of logical channels provided on the satellite service. A data mapper maps the satellite television logical channel identification information in the data stream to DTV channel identification information. A quadrature amplitude modulation (QAM) modulator modulates the DTV channel identification information, the television content and the program guide data for transmission as an output comprising one or more QAM transport streams to a digital television.

Abstract: A method and system is provided of protecting at least one part of a video stream or of a compressed video sequence against a violation of the information contained in said stream, said stream being able to be broken down into at least one first type of objects and one second type of objects, the method being applied to a selection of images contained in said video sequence, characterized in that it comprises at least the following steps: analyzing the video sequence in the compressed domain so as to define for a given image N at least one first type of objects to be protected by encryption and one second type of objects, the analysis module which identifies the portions of the image belonging to the first type of objects to be protected sends the motion estimation vectors and the transformed coefficients to the encryption step; determining, according to the breakdown into portions or into groups of portions of the existing image N, those corresponding respectively to the first type of objects to be protected

Abstract: In a subscriber television system with a host terminal, the present invention allows the identification of the individual packets from two separate MPEG transport streams that have been multiplexed together for decoding by a single external conditional access or point-of-deployment (POD) module. The decoding of individual packets from two separate MPEG transport streams supports the use of multiple tuner host terminals for such functions as picture-in-picture (PIP) program viewing and the viewing of one program while recording a second program.

Abstract: Disclosed is a digital broadcast reception apparatus which performs a scramble judgment by obtaining a judgment PID corresponding to PCR_PID and a judgment packet corresponding to the judgment PID and judging whether the judgment packet is obtained within a first time, subsequently by a value of tsc bit, subsequently by detecting a PES packet where payload starts and judging whether it is detected within a second time, subsequently by detecting packet_start_code_prefix and judging based on the detected value, and subsequently by a value of PES_scrambling_control.

Abstract: A unified system of programming communication. The system encompasses the prior art (television, radio, broadcast hardcopy, computer communications, etc.) and new user specific mass media. Within the unified system, parallel processing computer systems, each having an input (e.g., 77) controlling a plurality of computers (e.g., 205), generate and output user information at receiver stations. Under broadcast control, local computers (73, 205), combine user information selectively into prior art communications to exhibit personalized mass media programming at video monitors (202), speakers (263), printers (221), etc. At intermediate transmission stations (e.g., cable television stations), signals in network broadcasts and from local inputs (74, 77, 97, 98) cause control processors (71) and computers (73) to selectively automate connection and operation of receivers (53), recorder/players (76), computers (73), generators (82), strippers (81), etc.

Abstract: A unified system of programming communication. The system encompasses the prior art (television, radio, broadcast hardcopy, computer communications, etc.) and new user specific mass media. Within the unified system, parallel processing computer systems, each having an input (e.g., 77) controlling a plurality of computers (e.g., 205), generate and output user information at receiver stations. Under broadcast control, local computers (73, 205), combine user information selectively into prior art communications to exhibit personalized mass media programming at video monitors (202), speakers (263), printers (221), etc. At intermediate transmission stations (e.g., cable television stations), signals in network broadcasts and from local inputs (74, 77, 97, 98) cause control processors (71) and computers (73) to selectively automate connection and operation of receivers (53), recorder/players (76), computers (73), generators (82), strippers (81), etc.

Abstract: A CableCARD device for manipulation of a stream of data has an inband data input for receiving a stream of video data from a host, the stream of video data being encrypted and encoded according to a first coding. A decrypter decrypts the encrypted data. A transcoder transcodes the stream of video data to convert the stream of video data to a second coding, producing a transcoded data stream. An encrypter encrypts the transcoded data stream. An inband data output sends the encrypted transcoded data stream back to the host. This abstract should not be considered limiting, since other embodiments may incorporate more, fewer or different elements that those described in this abstract.

Abstract: Various embodiments provide a way to adjust transmission rates of a medium access controller (MAC) to a physical layer (PHY) to accommodate for packet expansions due to encryption that takes place in the PHY. In at least some embodiments, a communication interface between different MACs in a system is re-purposed to allow the PHY to communicate to a system MAC to notify the system MAC to pause and then resume, at an appropriate time, its packet transmissions.

Abstract: A unified system of programming communication. The system encompasses the prior art (television, radio, broadcast hardcopy, computer communications, etc.) and new user specific mass media. Within the unified system, parallel processing computer systems, each having an input (e.g., 77) controlling a plurality of computers (e.g., 205), generate and output user information at receiver stations. Under broadcast control, local computers (73, 205), combine user information selectively into prior art communications to exhibit personalized mass media programming at video monitors (202), speakers (263), printers (221), etc. At intermediate transmission stations (e.g., cable television stations), signals in network broadcasts and from local inputs (74, 77, 97, 98) cause control processors (71) and computers (73) to selectively automate connection and operation of receivers (53), recorder/players (76), computers (73), generators (82), strippers (81), etc.

Abstract: A process for distributing audiovisual sequences in accordance with a nominal stream format respecting a MPEG-2 TS norm including a succession of TS packets, including analyzing the stream made prior to transmitting to client equipment to generate a first stream in conformity with the MPEG-2 TS format, modifying all or part of the TS packets by substituting packets of the same structure, but whose content was modified, and generating a second stream of a format including digital information suitable for permitting reconstruction of the nominal stream, separately transmitting the two streams from a servers to the equipment, and a calculation is made on the equipment of a synthesis of a stream in nominal format as a function of the first stream and the second stream.

Abstract: A unified system of programming communication. The system encompasses the prior art (television, radio, broadcast hardcopy, computer communications, etc.) and new user specific mass media. Within the unified system, parallel processing computer systems, each having an input (e.g., 77) controlling a plurality of computers (e.g., 205), generate and output user information at receiver stations. Under broadcast control, local computers (73, 205), combine user information selectively into prior art communications to exhibit personalized mass media programming at video monitors (202), speakers (263), printers (221), etc. At intermediate transmission stations (e.g., cable television stations), signals in network broadcasts and from local inputs (74, 77, 97, 98) cause control processors (71) and computers (73) to selectively automate connection and operation of receivers (53), recorder/players (76), computers (73), generators (82), strippers (81), etc.

Abstract: A multimedia stream head end includes a legacy conditional access (CA) device that fully encrypts the stream using legacy keys. A copy of the stream is sent to a secondary CA device that encrypts only critical packets in the stream using secondary keys to render a partially encrypted stream. The critical packets in the fully encrypted stream from the legacy CA device are obtained and inserted next to the corresponding critical packets in the partially encrypted stream. Thus, only critical packets are encrypted, with encrypted versions being generated by both the legacy CA and secondary CA without the legacy CA knowing which of the packets that it encrypts are “critical”.

Abstract: A unified system of programming communication. The system encompasses the prior art (television, radio, broadcast hardcopy, computer communications, etc.) and new user specific mass media. Within the unified system, parallel processing computer systems, each having an input (e.g., 77) controlling a plurality of computers (e.g., 205), generate and output user information at receiver stations. Under broadcast control, local computers (73, 205), combine user information selectively into prior art communications to exhibit personalized mass media programming at video monitors (202), speakers (263), printers (221), etc. At intermediate transmission stations (e.g., cable television stations), signals in network broadcasts and from local inputs (74, 77, 97, 98) cause control processors (71) and computers (73) to selectively automate connection and operation of receivers (53), recorder/players (76), computers (73), generators (82), strippers (81), etc.

Abstract: According to one embodiment, a digital stream, inclusive of an Internet Protocol (IP) datagram, is transmitted to a digital device. IP datagram comprises an IP header and a body segmented including a plurality of packets in an MPEG format such as MPEG-2 or MPEG-4 for example. The plurality of packets comprises (i) a first packet including a payload having content and a header that comprises a first packet identifier to indicate a type of the content contained in the payload of the first packet, and (ii) a second packet including a payload and a secondary packet identifier to indicate that its payload includes content duplicative of the content contained in the first packet. The second packet precedes the first packet in the digital stream. Upon detecting the presence of duplicative content, the duplicative content is recovered, but the content contained in the payload of the first packet is disregarded.

Abstract: Techniques are disclosed for multiplexing a dynamic bit-rate video stream with an audio stream received by a client device in a manner that allows the resulting multiplexed stream to be played back without disruption, despite dynamic changes in the bit rate of the video stream that may occur. A content server may stream both a video stream and an audio stream to a client device for playback. The client device may multiplex the video and audio streams prior to them being presented to a playback engine for decoding and playback to a user.

Abstract: A signal transmission apparatus includes: a serial-to-parallel conversion unit serial-to-parallel converting HD-SDI format serial digital video signals of Link A containing CH1, CH3, CH5, and CH7, and Link B containing CH2, CH4, CH6, and CH8; a scrambler rewriting a specified timing reference signal among data of horizontal lines in converted Link A into a predetermined value, applying scrambling to only specified data, performing encoding, and outputting at least up to several bits of data following an error detection code; an extracting unit extracting RGB bits only from specified data among data of horizontal lines in converted Link B; an 8-bit/10-bit encoder subjecting the extracted RGB bits of the Link B to 8-bit/10-bit encoding; a multiplexing unit multiplexing scrambled parallel digital data of the Link A and encoded parallel digital data of the Link B; and a serial digital data generating unit generating serial digital data from the parallel digital data.

Abstract: A stream of content has multiple sub-streams, where each sub-stream comprises a part of the content and is divisible into logical blocks bounded by intrinsic partitions. For each sub-stream, a specification of the logical blocks bounded by the intrinsic partitions is defined and the sub-stream is divided into the logical blocks bounded by the intrinsic partitions. Each divided logical block is encrypted and then divided into one or more portions to produce corresponding pieces of data, and each piece of data is placed into a data packet as a payload thereof. Each data packet is transmitted to a recipient thereof, and the recipient can retrieve the pieces of data from the payloads of the packets, reconstruct the encrypted logical blocks, and manipulate the sub-stream on a per-logical block basis without necessarily decrypting each encrypted logical block.

Abstract: A source device permits a user of a remote device to access a protected file on the source device when the user of the remote device has a right to access the protected file. The user locates the protected file on the source device using the remote device and accesses the protected file using a media player on the remote device. The media player constructs a path by which the source device streams the protected file. The remote device responds to an authentication request from the source device that the user of the remote device has a right to access the protected file. The user is authenticated to confirm that the user of the remote device has a right to access the protected file. The protected file is streamed to the remote device via a path constructed by the remote device.

Abstract: Provided is a broadcast receiving device including a determining unit configured to make a determination on a channel selected by a selecting unit as to whether the corresponding encryption key is available or unavailable, and a control unit configured to, when the determining unit determines that the encryption key is unavailable, allow the selecting unit to sequentially select channels displayed in a channel window, allow the determining unit to make the determination, and allow an output unit to generate and output the channel window so that the channel with the encryption key determined as unavailable is identified.

Abstract: The present invention concerns a device and a process for signing digital streams, each of them comprising contents, related to audiovisual information, and a signaling. The device applies encrypting to selectively determined descriptors of the signaling, called authenticated descriptors, to obtain signature. The invention also concerns corresponding authentication device and process. Application to authentication of DVB/MPEG digital streams, notably for MHP.

Abstract: Subject matter includes methods of using conventional set-top boxes that receive streaming video modulated on coaxial cable rather than over an IP-based LAN as nodes in a media network. In one implementation, an exemplary adapter is used to integrate a conventional set-top box into a media network. In one implementation, an exemplary filter is used to reserve frequencies for communications between a conventional set-top box and a hub and to prevent communications from leaving a media network. In one implementation, an exemplary content protection method provides a way of encrypting program content on the media network in a manner that a conventional set-top box can decode.

Abstract: An AV data transmission apparatus having two or more output channels, the apparatus comprising: an encryption unit which encrypts AV data using an encryption key; an AV data transmission unit which transmits the encryption key and the encrypted AV data to AV data reception apparatuses from each output channel; an encryption key switching unit which switches an encryption key generation scheme to another one for the encryption key transmitted through a selected output channel; an output suspension unit which suspends output of the encrypted AV data transmitted through a selected output channel; and a control unit which causes (i) the output suspension unit to select an output channel and suspend the output of the encrypted AV data through the selected output channel, and then causes (ii) the encryption key switching unit to select the same output channel and switch the encryption key generation scheme to another one for the output channel.

Abstract: A system and method are described for greatly increasing the number of services that can be encrypted with existing conditional access equipment. The method is most useful when many digitally compressed programs are encrypted at the same time. Only the most critical components of each compressed video, audio, or data stream are selected and then sequenced into a single stream. Additional formatting causes this sequence of segments from multiple sources to appear as a single continuous stream to the conditional access system. Once this stream has been encrypted, it is demultiplexed and the components are restored and re-sequenced into their respective programs. Messages such as the Entitlement Control Messages that are inserted into the stream by the encryption system, are also adjusted and included with each of the reconstructed programs.

Abstract: A method, system, and apparatus for processing a data stream having both unencrypted and encrypted portions for storing, in the unencrypted portion of the data stream, location data signifying the location of predetermined data present in the encrypted portion of the data stream allowing efficient location of said predetermined data.

Abstract: A host receiver and a client receiver are operatively in a direct broadcast satellite system. Program materials received by the host receiver from the direct broadcast satellite system are decrypted by the host receiver. The decrypted program materials are then encrypted at the host receiver using a copy protection key. The copy protection key is encrypted at the host receiver using a host-client pairing key shared between the host receiver and client receiver. The encrypted program materials and the encrypted copy protection key are transferred from the host receiver to the client receiver. The transferred copy protection key is decrypted at the client receiver using the host-client pairing key. The transferred program materials are then decrypted at the client receiver using the decrypted copy protection key.

Abstract: A digital video broadcasting receiver comprising a first input for receiving a first transport stream of data (TS#1) and a second input for receiving a second transport stream of data (TS#2), each transport stream comprising a plurality of packets and each packets having a header including a packet identifier PID. A de-scrambling device (12) receives packets of a transport stream for de-scrambling. A router (20) is arranged to pass packets alternately from the first TS#1 and the second TS#2 transport streams to the de-scrambling device 12 and to pass packets alternately to a first a second output, so restoring the first and second transport streams of data in a descrambled form.

Abstract: Methods and apparatus for protecting copyrighted information, e.g., video signals, from unauthorized use are described. Encrypted video signals are transmitted from a source device, e.g., display adapter, to a display device, e.g., monitor, over analog signal lines after the identity of the destination device is confirmed by receipt of a certificate assigned to the destination device. A session key, used for encrypting the analog signals, is generated and exchanged between the source and destination devices. The source and destination devices each include a pseudo-random number generator driven by the session key. As part of the encryption process a false video signal is generated. The false video signal and R, G, B video signals are transmitted to the display device over four lines. The lines used to transmit the R, G, B and false video signals are periodically swapped as a function of the output of the pseudo random number generator to encrypt, e.g., scramble, the video signals.

Abstract: Information communication terminals for transmitting/receiving information that includes a plurality of elements are connected to each other via a network. A information communication terminal at a transmitting side sets security-coupling levels to a plurality of elements, sets a dividing rule for dividing the information into a plurality of pieces of loosely coupled information based on the set security-coupling levels, divides the information into a plurality of pieces of loosely coupled XML data based on the set dividing rule, and transmits the divided plurality of pieces of loosely coupled XML data and the set dividing rule.

Abstract: Methods and apparatuses for minimizing co-channel interference in communications systems are disclosed. A method in accordance with the present invention comprises scrambling a first header of the first signal using a first scrambling code, scrambling a second header of the second signal using a second scrambling code, and transmitting the first signal and the second signal with the scrambled first header and the scrambled second header over different channels of the communication system.

Abstract: A copyright protection method and apparatus employ a first protection scheme within a single authorized domain, in which all interfaces are protected with digital rights management system, and employ a second protection scheme for use in inter-domain file transfers. The method and apparatus employ a third protection scheme for external outputs not protected by a digital rights management system.

Abstract: Program materials received from a direct broadcast satellite system are distributed between a host receiver and a client receiver for remote decryption. Using either a same pairing key or different host and client pairing keys, an encrypted media encryption key is received at both the host and client receivers, and the encrypted media encryption key is decrypted at both the host and client receivers using the pairing key. Encrypted program materials are received from the broadcast system at the host receiver, and the encrypted program materials are decrypted at the host receiver using the media encryption key. The encrypted program materials are also transferred from the host receiver to the client receiver, where the encrypted program materials are decrypted at the client receiver using the media encryption key.

Abstract: A method and apparatus for remote control and/or monitoring of a multimedia system includes processing that begins when a hand held device transmits a remote control/monitoring request to a server. The processing continues once a communication path is established between the hand held device and the server by having the server determine remote control and monitoring privileges of the hand held device. If the hand held device has at least a minimum level of remote control and monitoring privileges, the processing continues as the server processes the remote control/monitoring request with respect to at least one client to produce operational monitoring data. The processing continues as the server provides the operational monitoring data to the hand held device via the communication path.

Abstract: The certificate with specified conditions under which copyright did material can be played. Copyrighted material, such as videos are stored in a storage unit. They are stored along with a policy that indicates when the information can be played. The information can, for example be encrypted one stored, and the decryption key is available only when characteristics of the policy are met. When those characteristics are not met, the information can not be retrieved at all or only can be retrieved in some very limited format.

Abstract: A digital television receiving system having a security mechanism which simultaneously handles two or more separate television program signals is described. The system includes a plurality of digital television receiver mechanisms for receiving a plurality of separate digital television program signal transport streams. The system also includes a multiplexer mechanism coupled to the digital television receiver mechanisms for tagging and multiplexing the received program signal transport streams into a single combined signal transport stream. The combined transport stream is supplied to a security mechanism which limits usable access to the combined stream to authorized users. The system further includes a demultiplexer mechanism for receiving an access-allowed combined transport stream from the security mechanism and demultiplexing the combined transport stream into separate transport streams corresponding to the separate transport streams received by the receiver mechanisms.

Abstract: The present invention provides a personal video recorder and control method thereof, by which two scrambled transport streams can be descrambled to fit the open cable standard. The present invention includes storing a video stream of a recording channel in a storage means, determining whether a video stream of a displaying channel is transferred the POD module, descrambling the stored video stream of the recording channel using the POD module if the video stream of the displaying channel is not transferred to the POD module, and storing the descrambled video stream in the storage means.

Abstract: A method and systems are provided for creating an authentication of secure communications between a software video driver and a video display. A video driver transmitting digital video data deemed high-bandwidth digital content, to a display, performs authentication to determine if a secure connection has been established with a display. The video driver and the display both generate encryption keys that are compared to ensure that the display used is authorized for secure communications. A single stream of video data is encrypted using the secret keys. A first encryption key encrypts even-numbered pixels in the single stream of video data. A second encryption key encrypts odd-numbered pixels in the single stream of video data. The stream is split into two streams of data, which are transmitted to a display. The display decrypts each of the streams of encrypted video data and merges them to re-create the original stream of video data.

Abstract: An IC card (processing terminal) divides a process into process blocks, and holds a time period required for processing each process block. A receiver (receiving terminal) notifies the IC card of a time period which can be spent for processing non-real-time process data when causing the IC card to perform the processing. The IC card processes the process blocks which can be processed within the notified time period. After the processing, the IC card once sends a response back to the receiver, and then transitions into a state in which it can receive a new request. Accordingly, it becomes possible for the IC card to process real-time process data such as an ECM. In the case where the receiver continues the suspended processing, it notifies the IC card of the continuation of the processing so that it causes the IC card to continue the processing of non-real-time process data.

Abstract: Systems and methods of secure content key distribution using multiple distinct methods are disclosed herein. Example embodiments include receiving multiple distinct control words from multiple conditional access systems and encrypting packets or a group of packets using the multiple distinct control words.

Abstract: A system and method are provided for decrypting a selected program. The system and method can receive at least one authorization message and at least one control message associated with a selected program. The system and method stores the at least one authorization message. The system and method transmits a first control signal if the at least one control message specifies a type of program that can be decrypted given the at least one authorization message and transmits a second control signal if the at least one control message specifies a type of program that can not be decrypted by the decryption device given the at least one authorization message.

Abstract: Disclosed is apparatus for processing an encrypted data stream within a computer system adapted to receive the encrypted data stream from a data storage device. A data output device is coupled to a computer system and has a plurality of data output areas. An encrypted data stream is transferred from a data storage device to the data output device, the encrypted data stream being for output to one of the plurality of data output areas. The encrypted data stream is received and decrypted to produce a clear data stream for output to one of the plurality of data output areas. A decryption means receives a decryption key from the computer system, the decryption key relating only to the encrypted stream associated with the one of the plurality of data output areas.

Abstract: A digital broadcast reception apparatus includes a first reception unit for receiving a certain digital broadcast, a second reception unit for receiving another digital broadcast, a control signal reception unit for receiving an update instruction signal that is instruction information indicating an update of software information, and a display control section for displaying, on a display, video images that correspond to contents of the certain digital broadcast received by the first reception unit. An IC card attached to the digital broadcast reception apparatus includes an update execution section which acquires the software information through the second reception unit and installs the acquired software information when the update instruction signal is received by the control signal reception unit.

Abstract: A multistream distributor and a multi-descrambler are provided at low cost, which are capable of displaying a plurality of transport streams corresponding respectively to a plurality of channels on a plurality of receivers or the like. Three first scrambled transport streams received via tuners are time-multiplexed by a multiplexer into one second scrambled transport stream. A multi-descrambler descrambles and encrypts each of the three first scrambled transport streams forming one second scrambled transport stream in correspondence with each of receivers.

Abstract: A common interface controller and a method of descrambling channels of first and second transport streams using a conditional access module for descrambling channels of a transport stream as identified by respective PIDs wherein an intermediate data stream is provided by time multiplexing at least a part of the first transport stream with at least a part of the second transport stream, the part of the first transport stream including a first channel and the part of the second transport stream including a second channel, and wherein the original value of a PID identifying the second channel is changed to an intermediate value not used by any PID of any respective channel in said at least a part of the first transport stream such that the intermediate data stream forms an intermediate transport stream for processing by the conditional access module.

Abstract: Disclosed are a conditional access transmission system and method, and a receiving terminal and method. The transmission system transmits scrambled broadcasting signals including a network identification code (NIC) in the digital broadcasting service. A repeating system repeats the broadcasting signals transmitted by the transmission system to a subscriber station. In this instance, the NIC of the repeating system is different from that of a main broadcasting network. A receiving terminal descrambles the scrambled broadcasting signals by using the NIC and a descrambling key. According to the present invention, the charged subscriber can receive broadcasting signals or TPEG messages in the repeating network.

Abstract: A computer-implemented method is described for processing multimedia channels comprising: encrypting a first group of multimedia channels using a first type of encryption to produce a first group of encrypted multimedia channels; encrypting the first group of multimedia channels using a second type of encryption to produce a second group of encrypted multimedia channels; concurrently transmitting the first group of encrypted multimedia channels with the second group of multimedia channels to a plurality of multimedia subscribers having multimedia receivers capable of decrypting the first group of encrypted multimedia channels and/or the second group of multimedia channels.

Abstract: Methods and apparatus for protecting copyrighted information, e.g., video signals, from unauthorized copying. Analog red (R), green (G) and blue (B) video signals are transmitted from a source device, e.g., a display adapter, to a display device, e.g., a monitor, over corresponding analog signal lines after the identify of the destination device is confirmed by receipt of a certificate assigned to the destination device. A session key, used for encrypting the analog signals, is generated and exchanged between the source and destination devices after the identification of the destination device is confirmed. The source and destination devices each includes a pseudo-random number generator driven by the session key. The lines that carry the R, G and B video signals are changed, e.g., swapped, on a periodic basis as a function of the output of the pseudo-random number generator in the source device.

Abstract: A video signal and an audio signal are time division multiplexed, encrypted, and transmitted. A transmission side time-compresses the audio signal, multiplexes, encrypts, and transmits the time-compressed audio signal in a blanking period of the video signal. Control is performed using an audio signal data enable signal ADE, and an audio signal/video signal switch signal.

Abstract: According to certain embodiments consistent with the present invention, a method of processing digital video content, wherein the digital video content comprises intra-coded frames and inter-coded frames, involves selecting a plurality of the intra-coded frames for encryption to produce selected frames; encrypting the selected frames under a first encryption algorithm to produce first encrypted frames; storing the inter-coded frames in a first file; and storing the intra-coded frames, whether encrypted under the first encryption algorithm or unencrypted, in a second file. For a multiple encryption embodiment consistent with the present invention, the method further involves duplicating the intra-coded frames; encrypting duplicates of the selected frames under a second encryption algorithm to produce second encrypted frames; storing the intra-coded frames, whether encrypted under the second encryption algorithm or unencrypted, in a third file.