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| Number | Title | Issue Date |
| 7856104 | System and method for ensuring secure communication between TV and set back box A random number or HDCP key is sent from a TV to a set back box (SBB) over a HDMI channel, and unless the SBB returns the same random number/key to the TV over a USB link, the TV will not communicate further with the SBB. ... | 12/21/2010 |
| 7502471 | System and method for protecting data streams in hardware components A scrambling architecture protects data streams in the operating system and hardware components of a computer by scrambling the otherwise raw data prior to the data being handled by the operating system. Scrambled content is passed to a filter graph (or other proces... | 03/10/2009 |
| 7463737 | System and method for conditional access key encryption A system for processing multimedia channels is described comprising: transmitting decryption keys for decrypting the multimedia channels, the keys encrypted in both a first encryption format and a second encryption format; the keys encrypted in the first encryption ... | 12/09/2008 |
| 7366302 | Apparatus and method for an iterative cryptographic block A method and apparatus for an iterative cryptographic block under the control of a CPU and without a fixed number of stages. In one embodiment, a first cryptographic block descrambles received information using an internal key or a preprogrammed key to form a descra... | 04/29/2008 |
| 7289566 | Cable modem tuner An IF signal output from an IF amplifying circuit included in a tuner is converted to have a band width for transmission by an SAW filter and has unnecessary signals removed therefrom. Thereafter, the resulting signal has its gain made constant by an IFAGC circuit, ... | 10/30/2007 |
| 7242772 | Encryption apparatus and method for synchronizing multiple encryption keys with a data stream A data stream, such as a digital motion picture, is encrypted in units of one or more blocks, each block having an assigned encryption key. A plurality of encryption keys is assigned to the complete data stream, with a synchronization index provided to map each indi... | 07/10/2007 |
| 7215774 | Video data transfer control system and method A video data transfer control system allowing secure protection of video data from unauthorized copying is disclosed. A scrambling key used to scramble video data is stored in a key register and a new scrambling key is stored in a register. At the timing of a vertic... | 05/08/2007 |
| 7185362 | Method and apparatus for security in a data processing system Method and apparatus for secure transmissions. Each user is provided a registration key. A long-time updated broadcast key is encrypted using the registration key and provided periodically to a user. A short-time updated key is encrypted using the broadcast key and ... | 02/27/2007 |
| 7096200 | System and method for evaluating and enhancing source anonymity for encrypted web traffic A system and method is provided for evaluating the effectiveness of data encryption for hiding the identity of the source of Web traffic. A signature is constructed from encrypted Web traffic for a Web page sent by a target Web site, and the signature is compared wi... | 08/22/2006 |
| 7069590 | System and method for protecting data streams in hardware components A scrambling architecture protects data streams in the operating system and hardware components of a computer by scrambling the otherwise raw data prior to the data being handled by the operating system. The architecture has a scrambler implemented at either the cli... | 06/27/2006 |
| 7043021 | Digital video content transmission ciphering and deciphering method and apparatus A video source device generates a session key for each transmission session wherein a multi-frame video content is to be transmitted to a video sink device. The video source device uses the session key to generate a successive number of frame keys. The frame keys in... | 05/09/2006 |
| 7043019 | Copy protection for digital motion picture image data An apparatus and method for displaying a copy-deterrent pattern (104) within a digital motion picture in order to discourage recording of the motion picture using a video camera or other sampling recording device. A copy-deterrent pattern (104) could b... | 05/09/2006 |
| 7039294 | Method and apparatus for modifying the effects of color burst modifications to a video signal In the known color stripe process for preventing recording of video signals, the color burst present on each line of active video is modified so that any subsequent video tape recording of the video signal shows variations in the color fidelity that appear as undesi... | 05/02/2006 |
| 7010125 | Method for tracing traitor receivers in a broadcast encryption system A method for tracing traitor receivers in a broadcast encryption system. The method includes using a false key to encode plural subsets representing receivers in the system. The subsets are derived from a tree using a Subset-Cover system, and the traitor receiver is... | 03/07/2006 |
| 7006115 | Supporting variable line length in digital display timing controllers using data enable signal A digital display unit which receives horizontal lines of unequal length in a V-active region and computes an average length of the lines. The average is used to generate horizontal line demarkers in the V-blank (vertical blank) region. The demarkers specify the tra... | 02/28/2006 |
| 6950602 | Digital data reproducing and recording apparatus creating latent deterioration In a digital data processing apparatus, a storage section stores data representative of digital contents of audio or video. A reproduction section processes the data to reproduce the digital contents. A reading section reads out the data from the storage section and... | 09/27/2005 |
| 6912513 | Copy-protecting management using a user scrambling key The present invention is a method and apparatus for providing copy protection for a content. A descrambler descrambles the content delivered by a content provider using a local key. A key generator is coupled to the descrambler to generate the local key from a progr... | 06/28/2005 |
| 6772434 | Device and method for the integrated presentation of a secondary service as a part of a primary service A method and apparatus for providing an integrated presentation of existing media program services and secondary media program services is described. The method comprises the steps of receiving and displaying an electronic program guide comprising channels and progr... | 08/03/2004 |
| 6731758 | Digital video content transmission ciphering and deciphering method and apparatus A video source device generates a session key for each transmission session wherein a multi-frame video content is to be transmitted to a video sink device. The video source device uses the session key to generate a successive number of frame keys. The frame keys in... | 05/04/2004 |
| 6690795 | Multiple keys for decrypting data in restricted-access television system An encryption system for restricted-access television systems. Multiple decryption keys are used to decrypt encrypted material which is transmitted to customers of a restricted-access television system.... | 02/10/2004 |
| 6570990 | Method of protecting high definition video signal A system controls reproduction of a video transmission between a transmitter and a receiver. The system includes an encryptor with an offset generator adapted to receive the encrypted frame key and to generate a sequence, of pseudo-random values for the c... | 05/27/2003 |
| 6370209 | Process for sensing manipulations of digital information In a method for detecting a manipulation performed on digital information the erroneous determination of a manipulation during processing disturbances is prevented by subdividing the information into information subunits from each of which an identificati... | 04/09/2002 |
| 6317831 | Method and apparatus for establishing a secure connection over a one-way data path Improved techniques for facilitating secure data transfer over one-way data channels or narrowband channels are disclosed. Often, these channels are wireless channels provided by wireless data networks. The techniques enable cryptographic handshake operat... | 11/13/2001 |
| 6292567 | Sync suppression television security system with addressable sync restoration A television transmission security system, including scrambling a television signal by suppressing at least one of the horizontal sync pulse and vertical blanking interval of the television signal; transmitting the scrambled television signal; generating,... | 09/18/2001 |
| 6278780 | Method of and an apparatus for generating internal crypto-keys To provide a method of generating internal crypto-keys to be set initially in a feedback-shift-registers of a pseudo-random-sequence generator of a stream cipher system with sufficient security and sufficiently high speed as well, the method comprises: a ... | 08/21/2001 |
| 6252964 | Authorization of services in a conditional access system A cable television system provides conditional access to services. The cable television system includes a headend from which service "instances", or programs, are broadcast and a plurality of set top units for receiving the instances and selectively decry... | 06/26/2001 |
| 5812665 | Switched channel system A switching apparatus and method for routing RF scrambled signals. One of a plurality of scrambled RF television information signals is selected. A processor assigns an output carrier frequency. The selected scrambled television information signal is outp... | 09/22/1998 |
| 5754650 | Simultaneous multichannel television access control system and method A multichannel television access control system is disclosed wherein processing of the broadband signal is performed by gated coherent RF injection on a plurality of channels, thereby effecting selective descrambling of an arbitrary subset of channels in ... | 05/19/1998 |
| 5682426 | Subscriber site method and apparatus for decoding and selective interdiction of television channels An decryption system which facilitates simultaneous decryption of multiple encrypted television channel signals thus making them simultaneously available for direct tuning in television receivers. The system is characterized by the utilization of a plural... | 10/28/1997 |
| 5488659 | Encryption/decryption process and apparatus for a multichannel television system An encryption/decryption system which facilitates simultaneous decryption of multiple encrypted television signals thus making them simultaneously available for direct tuning in television receivers. The system is characterized by the utilization of a plu... | 01/30/1996 |
| 5430799 | Multichannel television signal scrambling and descrambling system and method A multichannel television access control system is disclosed wherein processing of the broadband signal is performed by gated coherent RF injection on a plurality of channels, thereby effecting selective descrambling of an arbitrary subset of channels in ... | 07/04/1995 |
| 5412720 | Interactive home information system An interactive cable television system having a plurality of feeder servers, a plurality of home interface controllers and a feeder port. Home interface controllers are each equipped with a radio frequency input and a data communications link with a recei... | 05/02/1995 |
| 5402489 | Scrambled video signal transmission system with pulse-code modulated subcarrier A scrambled frequency modulated video signal transmission system is provided with a headend station having a d.c. coupled amplitude demodulator for removing the amplitude modulation of a scrambled amplitude modulated baseband video signal. The low frequen... | 03/28/1995 |
| 5319709 | System for broadband descrambling of sync suppressed television signals A television system having sync suppression scrambling and descrambling which includes in band and out of band signaling methods. The in band signaling method modulates the IF sound carrier of a premium video channel with timing and data pulses while the ... | 06/07/1994 |
| 5319708 | System for the simultaneous coding of a number of television signals and for decoding thereof in radiofrequency A system for the simultaneous coding of a number of television signals and for decoding thereof in radiofrequency. The radiofrequency TV signal or signals to be distributed undergo remodulation on at least one channel by a signal which does not alter the ... | 06/07/1994 |
| 5230019 | Key signal conversion device for CATV system A key signal conversion device for use in a CATV television system in which more than one different scrambling process is performed, the conversion device receiving one of a scrambled high-frequency signal in a television system and a sound intermediate f... | 07/20/1993 |
| 5206908 | Method and apparatus for detecting timing pulses for scrambled television system A method and apparatus for detecting timing pulses for descrambling a scrambled television signal, wherein a video IF signal and a sound IF signal are separated from a scrambled television IF signal by utilizing different filters, a local video carrier wa... | 04/27/1993 |
| 5136641 | Scrambled video digital transmission link A scrambled video digital transmission link comprising an amplitude modulator, a scrambler, an amplitude demodulator and frequency conversion apparatus for providing a scrambled video signal in a baseband format and a modified sound signal which includes ... | 08/04/1992 |
| 5125028 | Television signal scrambling method and apparatus A television scrambling system of the GSS type includes a false key signal to defeat pirate decoders. The false key is placed approximately one half a horizontal line period following the last horizontal sync pulse preceding the vertical blanking interval... | 06/23/1992 |
| 5113441 | Method for scrambling a television signal and method and apparatus for descrambling a scrambled television signal A method of scrambling a television signal and a method of and apparatus for descrambling a television signal is provided. An audio signal is used on which a key signal containing compression information and information concerning the position of a vertic... | 05/12/1992 |
