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| Number | Title | Issue Date |
| 7391866 | Broadcast apparatus and reception apparatus for providing a storage service by which scrambled content is stored and descrambled using scrambling key list A reception apparatus includes: a reception unit for receiving the scrambled content, the scrambled content being scrambled so that a predetermined unit of scrambled content is descrambled using a descrambling key corresponding to the predetermined unit of scrambled... | 06/24/2008 |
| 7359507 | Server-assisted regeneration of a strong secret from a weak secret Methods for regenerating a strong secret for a user, based on input of a weak secret, such as a password, are assisted by communications exchanges with a set of independent servers. Each server holds a distinct secret value (i.e., server secret data). The strong sec... | 04/15/2008 |
| 7352864 | Display device A display device comprises a nonvolatile memory for storing an amount of adjustment obtained in a blanking adjustment most recently performed for a particular video signal, means for judging whether or not the particular video signal is inputted, means for masking a... | 04/01/2008 |
| 7325145 | Verifying the presence of an original data storage medium A verification system randomly retrieves data from a removable data storage medium. The retrieved data is compared to corresponding verification data, which is known to be valid. The system determines that a legitimate removable data storage medium is present if the... | 01/29/2008 |
| 7317797 | Seamless switching between multiple pre-encrypted video files In a video on demand (VOD) system, methods and apparatus are provided for seamlessly switching back and forth between two pre-encrypted files having changing encryption keys. Such switching back and forth may be required when a VOD server stores both a “normal” ... | 01/08/2008 |
| 7302581 | Storing apparatus and password control method A drive preserves a default input password. When there is no password input from the user, the default input password is regarded as a user input password and is compared and collated with a password for access protection, thereby controlling the access protection. ... | 11/27/2007 |
| 7286667 | Decryption system An apparatus for manipulating a selectively encrypted data stream in a manner consistent with certain embodiments has a filter that selects a set of packets from the selectively encrypted data stream based upon packet identifier values to produce a stream of packets... | 10/23/2007 |
| 7275258 | Apparatus and method for multi-threaded password management An apparatus and method for multi-threaded password management are provided. With the apparatus and method, resources may be grouped into families of resources. A family of resources is defined as a group of resources that may make use of the same password. When a u... | 09/25/2007 |
| 7191338 | Secure method for providing privately viewable data in a publicly viewable display A method for securely providing privately viewable data in a publicly viewable display can include interspersing private data frames among public data frames according to a sequencing pattern. A syncstream can be encoded based upon a syncstream mask. More particular... | 03/13/2007 |
| 7174186 | Method for selecting broadcasting tower, program for selecting broadcasting tower, storage medium storing same program and broadcast receiving device The broadcasting tower selecting method for selecting one broadcasting tower out of a plurality of broadcasting towers each being able to transmit together broadcast waves on a plurality of channels that can be received in an area, including: a first step of judging... | 02/06/2007 |
| 7165267 | Storing apparatus and password control method A drive preserves a default input password. When there is no password input from the user, the default input password is regarded as a user input password and is compared and collated with a password for access protection, thereby controlling the access protection. ... | 01/16/2007 |
| 7111172 | System and methods for maintaining and distributing personal security devices This invention relates to methods and apparatus for securely accessing and providing information including the use of a personal security device on a client where the client is subject to compromise. ... | 09/19/2006 |
| 7103184 | System and method for sign mask encryption and decryption In general, one embodiment of the invention involves a method to protect the integrity of the sign mask. The method involves computing a key shared by a plurality of software modules employed within an image display device and encrypting a sign mask with the shared ... | 09/05/2006 |
| 7049887 | Envelope elimination and restoration linear amplifier The gain of an envelope elimination and restoration linear amplifier is controlled by controlling the gain of its envelope control feedback path. ... | 05/23/2006 |
| 7043022 | Packet order determining method and apparatus A transmitter adds packet transmission order information to transmitted packets using a forward error device (416) and a masking device (420). The masking device (420) receives ordering masks (610) from a mask store (424). The orde... | 05/09/2006 |
| 6925342 | System and method for protecting digital media A system and method for verifying digital recordings that have a plurality of tracks. The system includes an encoder that: divides the digital recording into a plurality of sections and associates a random number with each section; calculates an identifier as a func... | 08/02/2005 |
| 6839433 | Method and apparatus for generating a signal that defeats illegal cable decoders Illegal cable decoders, i.e., black boxes, are defeated by adding, inserting and/or superimposing an added signal onto an already scrambled video signal, which added signal is capable of disrupting the operation of the illegal cable decoder. As a result of the added... | 01/04/2005 |
| 6792111 | Cryptation system for packet switching networks based on digital chaotic models A cryptation system for information transmitted through packet switching networks masks the digital information data by combining it at the transmitting station with digital data of a certain cryptation code before transmitting the so-encrypted data through the netw... | 09/14/2004 |
| 6477431 | Watermark detection A method and arrangement for detecting a watermark in an information signal. The method may include the steps of computing the correlation (dk) of the watermark (Wi) and the information signal (e.g. an image Q) for a plurality of pos... | 11/05/2002 |
| 6408076 | Digital video broadcasting In order to descramble sections of scrambled data interleaved with sections of unscrambled data in a transport stream of broadcast video data, while leaving the sections with the original timing relationship in the transport stream, a common data flow pat... | 06/18/2002 |
| 6330333 | Cryptographic system for wireless communications A wireless communications system (110) with increased privacy. The system (110) transmits an encrypted signal between a base station (112) and a wireless terminal (122). In the forward channel, the base station (112) includes an encryptor (130) with a lon... | 12/11/2001 |
| 6240184 | Password synchronization A system, method, and data structure provide for securely synchronizing passwords and/or other information between systems. The password-related information is stored in the systems in a secure manner, and a user or some other, external agent participates... | 05/29/2001 |
| 6216228 | Controlling video or image presentation according to encoded content classification information within the video or image data Provided is a method and a system for automatically controlling display of video or image data in dependence on content classification information which is integrated within the data by means of invisible digital watermarking techniques. A controller deco... | 04/10/2001 |
| 6148320 | Multichannel digital signal generation method and apparatus 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 ... | 11/14/2000 |
| 6061793 | Method and apparatus for embedding data, including watermarks, in human perceptible sounds A technique for hiding of data, including watermarks, in human-perceptible sounds, that is, audio host data, is disclosed. In one embodiment a method comprises three steps. In the first step, data to be embedded is inputted. In the case of a watermark, th... | 05/09/2000 |
| 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 |
| 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 |
| 5091935 | Method and system for scrambling information signals A method and system for scrambled transmission of an information signal having a regular, repeating information rate from which a receiver of the information signal derives synchronizing information as in a television video signal. The information signal ... | 02/25/1992 |
| 5022078 | Television signal enhancement and scrambling system A television signal is distorted by passing it through a distortion amplifier which applies a Gaussian distortion curve to the signal. The curve has a maximum increase in amplitude of about 38 dB, which is about 30 dB with respect to the amplitude increas... | 06/04/1991 |
| 4920566 | Dual loop sinewave descrambler and method of descrambling A method and apparatus are provided for descrambling a sinewave scrambled television signal. The television signal is applied to a dual loop circuit that detects AM sinewave modulation on the television signal sound carrier. The detected modulation is app... | 04/24/1990 |
| 4790010 | Enhanced scrambling method and system for TV signals A television signal transmission system includes a cable head-end having a scrambler for scrambling a television signal and a subscriber decoder having an unscrambler for unscrambling the television signal in response to data signals from the transmitter.... | 12/06/1988 |
| 4731838 | AGC circuit used in a CATV receiver An AGC circuit used in a subscriber's receiver of a CATV system in which the television signal is scramble-modulated so that only subscribers are allowed to view toll programs, wherein the detected video signal is conducted through a low-pass filter to ex... | 03/15/1988 |
| 4589016 | FM television signal receiving circuit A receiving circuit for receiving an FM-modulated television signal with an energy dispersal signal superposed thereon is used for a television receiver for receiving the FM-modulated television signal. The receiving circuit is provided with a triangle wa... | 05/13/1986 |
| 4581637 | PIN diode modulator A sine wave modulator for decoding a sine wave encoded television signal includes a passive attenuation network comprising a pi-arrangement of PIN diodes. The encoded signal is supplied to the input port and the decoded signal is taken from the output por... | 04/08/1986 |
| 4568974 | Video scrambling by the application of a variable periodic scrambling waveform A means for scrambling video signals by the application of a periodic scrambling waveform which has the effect of altering the normal amplitude relationship between horizontal sync and the video picture portion of a horizontal line uses the comparison bet... | 02/04/1986 |
| 4489347 | Sine-wave decoding technique A decoder includes an oscillator supplying a decoding signal to the control input of an RF modulator for decoding a sine wave encoded television signal. The decoding signal developed by the oscillator is randomly phase locked in either of two states with ... | 12/18/1984 |
| 4454543 | Dynamic video scrambling A means for coding and decoding video signals by the application of one of a plurality of available scrambling signals includes means for comparing the brightness level during a predetermined time period of the video signal with the brightness level of th... | 06/12/1984 |
| 4447828 | Phase change dynamic scrambling A means for coding and decoding video signals by the application of one of a plurality of available scrambling signals, which scrambling signals have a common frequency but differ in phase, includes means for comparing the brightness level during a predet... | 05/08/1984 |
| 4353088 | Coding and decoding system for video and audio signals A coding and decoding system for video signals includes means at the transmitter for applying sine wave amplitude modulation of approximate line frequency to the aural carrier to prevent the chrominance subcarrier from providing receiver synchronization.... | 10/05/1982 |
