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| Number | Title | Issue Date |
| 8103000 | Slice mask and moat pattern partial encryption A selective encryption encoder consistent with certain embodiments of the invention has vertical and/or horizontal stripes encrypted. In one embodiment, packets are examined in the digital video signal to identify a specified packet type, the specified packet type b... | 01/24/2012 |
| 7965840 | Data transmission and reception method and data transmission and reception device A method of transmitting and receiving data in which cipher-transmission of digital information data for which forbidden codes including timing identification codes are predetermined can be carried out with enciphered digital information data without containing unde... | 06/21/2011 |
| 7957530 | Method and system for ensuring secure scrambling and de-scrambling and the distribution of vectoral visual sequences A process for secured distribution of vector visual sequences in at least two dimensions, animated and including a succession of frames containing at least one multidimensional geometric object to be displayed on a screen of a user and determined by at least one par... | 06/07/2011 |
| 7751563 | Slice mask and moat pattern partial encryption A selective encryption encoder consistent with certain embodiments of the invention has vertical and/or horizontal stripes encrypted. In one embodiment, packets are examined in the digital video signal to identify a specified packet type, the specified packet type b... | 07/06/2010 |
| 7370266 | Digital signal decoding device and digital signal decoding method A digital signal decoding device according to an aspect of the present invention is a digital signal decoding device for generating a binary code sequence by maximum likelihood estimation from a convolutionally encoded input signal sequence, includes an add-compare-... | 05/06/2008 |
| 7336787 | Critical packet partial encryption An encryption arrangement for multiple encryption of television programs. A system according to embodiments of the present invention multiple encrypts only a portion of the data required for full presentation of a television program to permit coexistence of multiple... | 02/26/2008 |
| 7334248 | Conditional access filter as for a packet video signal inverse transport system A method and an apparatus for processing a packetized transport stream that determines whether a sequence of transport packets are received in a proper sequence and whether an error is present in a particular transport packet. The method includes the steps of determ... | 02/19/2008 |
| 7302059 | Star pattern partial encryption A selective encryption encoder consistent with certain embodiments of the invention has a packet identifier that identifies packets of a specified packet type, the specified packet type being defined by packets occurring in a star pattern approximately situated at a... | 11/27/2007 |
| 7292690 | Video scene change detection A selective encryption encoder consistent with certain embodiments of the invention has vertical and/or horizontal stripes encrypted. In one embodiment, packets are examined in the digital video signal to identify a specified packet type, the specified packet type b... | 11/06/2007 |
| 7242773 | Multiple partial encryption using retuning A partial dual encryption encoder, consistent with certain embodiments of the present invention receives video from a source of an unencrypted digital video signal. A first segment of the unencrypted digital video signal is selected for transmission over a first cha... | 07/10/2007 |
| 7236544 | Enhanced preamble to enable low power detection System and method for enabling the low power detection of a transmitted sequence. A preferred embodiment comprises the replacement of a portion of a preamble (after the application of any needed scrambling) with an expected sequence field (such as the expected seque... | 06/26/2007 |
| 7221761 | Error resilient digital video scrambling A method and an apparatus for error resilient, digital image scrambling are disclosed. Error resilience scrambling is produced by shuffling transform coefficients between arrays of coefficients arranged along an axis substantially orthogonal to the axis along which ... | 05/22/2007 |
| 7215770 | System and method for partially encrypted multimedia stream 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 p... | 05/08/2007 |
| 7200747 | System for ensuring data privacy and user differentiation in a distributed file system A security module is configured to provide an owner the capability to differentiate between users. In particular, the security module is configured to generate an asymmetric read/write key pair for respectively decrypting/encrypting data for storage on a disk. The o... | 04/03/2007 |
| 7155012 | Slice mask and moat pattern partial encryption A selective encryption encoder consistent with certain embodiments of the invention has vertical and/or horizontal stripes encrypted. In one embodiment, packets are examined in the digital video signal to identify a specified packet type, the specified packet type b... | 12/26/2006 |
| 7046806 | Information recording apparatus and method, and information reproduction apparatus and method As an example of this invention, user data which is broken up into sectors and is scrambled for each sector using a randomly generated scramble pattern, and scramble pattern data for specifying the scramble pattern used in scrambling are recorded on a recording medi... | 05/16/2006 |
| 6971050 | Interleaving method and apparatus, de-interleaving method and apparatus, and interleaving/ de-interleaving system and apparatus An interleaving apparatus comprises a first storing unit for storing data to be transmitted and a first control unit for controlling the first storing unit so that the data to be transmitted is outputted from the first storing unit with the data to be transmitted ar... | 11/29/2005 |
| 6950520 | Method and apparatus for carrying data in a video signal so that the data is not recorded A method and apparatus for modifying a video signal to allow it to carry encoded data which is detectable at a suitably compliant receiver but is not recorded by a conventional video recorder. One application is to carry a descrambling key to prevent useful recordin... | 09/27/2005 |
| 6859536 | Video-signal output apparatus and video-signal input apparatus A video-signal output apparatus performs scrambling, and a video-signal input apparatus performs descrambling. The scrambling and the descrambling are performed so that signal lines are shifted for each period corresponding to one horizontal scanning interval of ana... | 02/22/2005 |
| 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 |
| 6226384 | Method and device for providing controlled access video signals without providing a signal in the clear A display device for receiving encrypted or scramble video data and for decrypting or descrambling the video data such that a signal is not provided "in the clear". The video data is stored in a memory array in an encrypted form and read out from the memo... | 05/01/2001 |
| 6222926 | Method and device for providing controlled access video signals without providing a signal in the clear A LCD display device for receiving encrypted video data and for decrypting the video data such that a signal is not provided "in the clear" before receipt by the display device. The video data is encrypted within a row of video and decrypted at the displa... | 04/24/2001 |
| 6169584 | Automatic modulation control of sync suppressed television signals The depth of modulation and the absolute RF carrier level of an amplitude-modulated video signal are automatically adjusted. For adjustment of the depth of modulation, a sync tip of the video signal is sampled, corrected and normalized to a reference leve... | 01/02/2001 |
| 5555305 | Method and apparatus for secure transmission of video signals Video signals are sampled at 4Fsc locked onto sub-carrier phase and frequency. The active picture lines of each field are divided into 6 blocks of 47 lines and the active line periods of those lines scrambled on a block by block basis by line order shuffl... | 09/10/1996 |
| 5375168 | Method for scrambling and unscrambling a video signal A scrambling method wherein each image line (23-309) of a frame having been produced in unscrambled form before being scrambled, is given the pseudorandomly determined address (B) of the memory line in the storage memory (8) in which said image line is to... | 12/20/1994 |
| 5355409 | Scramble codec and a television receiver incorporating the same A scramble codec comprises a latch means for holding an ID number for securing television or other communication data, a pair of memories which can be alternately loaded with input communication data signals in a predetermined cycle, a shift register whic... | 10/11/1994 |
| 5335275 | Television scrambler A video encryption/decryption system in which lines of video information are stored in digitised form in a block of RAM memory, and are typically shuffled in groups of 32 lines by pivot reading information corresponding to 32 lines from the memory in a fi... | 08/02/1994 |
| 5321748 | Method and apparatus for television signal scrambling using block shuffling A method and apparatus for scrambling video signals to obtain the secure transmission of video information. A block of video lines in a television raster is divided into top and bottom sub-block portions. The top and bottom sub-block portions are switched... | 06/14/1994 |
| 5249229 | Device and method for generating control signals A device and to a method for generating control signals is set forth. The device according to the present invention allows the generation, from a single time reference, of the write control (WE) and read control (RE) signals for the information relating t... | 09/28/1993 |
| 5191609 | Scrambling and unscrambling circuit There is disclosed a circuit for scrambling an input signal, which has a pseudo-random address generator to detect a synchronizing signal from the input signal and to generate therefrom pseudo-random address and sequential address. The inventive circuit h... | 03/02/1993 |
| 5182771 | Anti-taping method and apparatus for a multiplexed analog component television system An apparatus for transmitting a multiplexed analog component television signal. The apparatus includes a signal source generator for generating a signal source having information regarding the number of lines per frame. A multiplexed analog component tele... | 01/26/1993 |
| 5161014 | Neural networks as for video signal processing A television signal processing apparatus includes at least one neural network for processing a signal representing an image. The neural network includes a plurality of perceptrons each of which includes circuitry for weighting a plurality of delayed repre... | 11/03/1992 |
| 5058158 | Video scrambling apparatus and method based on space filling curves A method of encrypting a video signal employing a pseudorandom Space Filling Curve having a highly irregular scanning pattern for scanning the pixel addresses of a video picture stored in a frame buffer. The method is used with a video scrambler/descrambl... | 10/15/1991 |
| 5040211 | Reliable television transmission through analog channels The presence of random noise, interference, multipath, and imperfect frequency response in terrestrial broadcasting channels, and of pervasive low-level reflections in cable systems, degrades the quality of television reception. These effects tend to redu... | 08/13/1991 |
| 5034981 | Anti-copying video signal processing Counting circuitry in the vertical synchronizing circuit of a video receiver is prevented from generating vertical control signals at a fixed, standard periodicity when the video signal transmitted to that receiver exhibits a changing field interval which... | 07/23/1991 |
| 5003590 | Encoding an optical video disc to inhibit video tape recording A system and method for encoding an optional video disc to inhibit unauthorized recording of played back signals by conventional videotape recorders is provided. A source program is mounted on a video signal generating means. The video signal is modified ... | 03/26/1991 |
| 4916739 | Adhesive photocopyable transparency for use in a secure facsimile transmission system An adhesive photocopyable transparency for use in a secure facsimile transmission system wherein one of two partial documents each containing portions of an original document which are complementary and mutually exclusive is photocopied onto the transpare... | 04/10/1990 |
| 4914694 | Modifying a television signal to inhibit recording/reproduction A composite television signal is modified to inhibit the reproduction of an unauthorized recording thereof by conventional video recorders but enable the display of a video picture therefrom on a television receiver. The length of a frame (more particular... | 04/03/1990 |
| 4910772 | Video scrambling apparatus and method based on space filling curves A method of encrypting a video signal employing a pseudo-random Space Filling Curve having a highly irregular scanning pattern for scanning the pixel addresses of a video picture stored in a frame buffer. The method is used with a video scrambler/descramb... | 03/20/1990 |
| 4821321 | Automatic secure transmission and reception of pictorial information A real time coding system for the transmission and reception of pictorial o-dimensional information at television (TV) rates. In one coding system, the input signal and a coding signal are modulo added in an operational amplifier and are transmitted there... | 04/11/1989 |
