| 7043021 |
Digital video content transmission ciphering and deciphering method and apparatus |
| May-9-2006 |
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... |
| 6912513 |
Copy-protecting management using a user scrambling key |
| Jun-28-2005 |
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... |
| 6772434 |
Device and method for the integrated presentation of a secondary service as a part of a primary service |
| Aug-3-2004 |
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... |
| 6731758 |
Digital video content transmission ciphering and deciphering method and apparatus |
| May-4-2004 |
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... |
| 6690795 |
Multiple keys for decrypting data in restricted-access television system |
| Feb-10-2004 |
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. |
| 6570990 |
Method of protecting high definition video signal |
| May-27-2003 |
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... |
| 6370209 |
Process for sensing manipulations of digital information |
| Apr-9-2002 |
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... |
| 6317831 |
Method and apparatus for establishing a secure connection over a one-way data path |
| Nov-13-2001 |
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.... |
| 6292567 |
Sync suppression television security system with addressable sync restoration |
| Sep-18-2001 |
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... |
| 6278780 |
Method of and an apparatus for generating internal crypto-keys |
| Aug-21-2001 |
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... |
| 6252964 |
Authorization of services in a conditional access system |
| Jun-26-2001 |
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... |
| 5812665 |
Switched channel system |
| Sep-22-1998 |
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... |
| 5754650 |
Simultaneous multichannel television access control system and method |
| May-19-1998 |
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... |
| 5682426 |
Subscriber site method and apparatus for decoding and selective interdiction of television channels |
| Oct-28-1997 |
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... |
| 5488659 |
Encryption/decryption process and apparatus for a multichannel television system |
| Jan-30-1996 |
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... |
| 5430799 |
Multichannel television signal scrambling and descrambling system and method |
| Jul-4-1995 |
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... |
| 5412720 |
Interactive home information system |
| May-2-1995 |
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... |
| 5402489 |
Scrambled video signal transmission system with pulse-code modulated subcarrier |
| Mar-28-1995 |
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... |
| 5319709 |
System for broadband descrambling of sync suppressed television signals |
| Jun-7-1994 |
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... |
| 5319708 |
System for the simultaneous coding of a number of television signals and for decoding thereof in radiofrequency |
| Jun-7-1994 |
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... |
| 5230019 |
Key signal conversion device for CATV system |
| Jul-20-1993 |
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... |
| 5206908 |
Method and apparatus for detecting timing pulses for scrambled television system |
| Apr-27-1993 |
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... |
| 5136641 |
Scrambled video digital transmission link |
| Aug-4-1992 |
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... |
| 5125028 |
Television signal scrambling method and apparatus |
| Jun-23-1992 |
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... |
| 5113441 |
Method for scrambling a television signal and method and apparatus for descrambling a scrambled television signal |
| May-12-1992 |
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... |
| 5103477 |
Method and apparatus for descrambling a television signal |
| Apr-7-1992 |
An extension control signal for a vertical blanking interval (VBI) rises at a timing delayed from the last key signal before the VBI by 64 .mu.sec plus the time difference between the key signal and horizontal... |
| 5091935 |
Method and system for scrambling information signals |
| Feb-25-1992 |
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... |
| 5063594 |
Video signal scrambling system |
| Nov-5-1991 |
A system for level-compressing a sync signal component of a video intermediate frequency signal to scramble the signal. A compression pulse generation circuit generates a compression pulse in synchronism... |
| 5058160 |
In-band controller |
| Oct-15-1991 |
The present invention discloses a method and apparatus for providing a cable TV system with the ability to issue information from a system manager, determine whether the information is intended for a set... |
| 5008934 |
CATV transmission system using scrambled signals |
| Apr-16-1991 |
A CATV system includes a main head end as a system center and a plurality of subhead ends. A baseband TV signal is transmitted from the main head end to the subhead ends through optical fiber cables. A... |
| 4953208 |
CATV system transmitting a scrambled television signal |
| Aug-28-1990 |
A method of scrambling a television signal is provided in which, during a horizontal blanking interval and during a vertical blanking interval, a video signal is compressed and a key signal containing... |
| 4951313 |
Scrambled frequency modulated video signal transmission system |
| Aug-21-1990 |
A scrambled frequency modulated video signal transmission system is provided with a headend station having a DC coupled amplitude demodulator for removing the amplitude modulation of a scrambled amplitude... |
| 4939780 |
CATV converter |
| Jul-3-1990 |
A CATV converter having a filter for extracting a voice intermediate frequency signal superposed with a data signal necessary to descramble a scrambled television signal by AM modulation, a synchronous... |
| 4928309 |
Method and apparatus for descrambling a television signal |
| May-22-1990 |
A baseband television signal having a video portion with a suppressed horizontal sync pulse is descrambled by using a variable attenuator. The attenuator shifts the level of predetermined portions of the... |
| 4926477 |
Cable television descrambler |
| May-15-1990 |
A descrambler for a scrambled channel having a suppressed horizontal synchronization pulse which scrambled channel is provided in a broadband cable television signal along with nonscrambled channels. A... |
| 4922532 |
Sync suppression scrambling and descrambling of television signals for subscription TV |
| May-1-1990 |
The quality of sound delivered to a subscriber viewing a channel which has been scrambled using sync suppression scrambling, particularly when the program is being transmitted with stereo sound, is improved... |
| 4910771 |
Television signal converter |
| Mar-20-1990 |
A television signal converter includes a CATV tuner having a channel converting function, a gain changing circuit for descrambling the output from the CATV tuner and the like, in order to convert a television... |
| 4901351 |
Video signal scramble system |
| Feb-13-1990 |
A transmitter encoder has a gain selector for compressing the level of a horizontal sync signal component of a video intermediate frequency (IF) signal to scramble it, and an AM modulation degree controller... |
| 4839922 |
CATV scrambling and descrambling method |
| Jun-13-1989 |
A CATV scrambling and descrambling method in which the horizontal and vertical synchronizing signals of a composite television video signal are compressed in level, and a timing signal indicating the time... |
| 4771457 |
Subscription television system |
| Sep-13-1988 |
A subscription television system sends out a reference level signal together with a timing pulse on the transmitting side and, on the receiving side, extracts the reference level signal and suppresses... |
| 4672440 |
Scrambled signal detector |
| Jun-9-1987 |
A television converter includes a circuit for detecting scrambled signals and enabling the descrambler in response thereto. Scrambled signals are detected by sensing amplitude modulated digital tag information... |
| 4659875 |
Electronic system for the secret transmission of audio signals |
| Apr-21-1987 |
System for the secret transmission of audio signals having at one end a coding arrangement comprising an input low-pass filter which selects the secret audio signals to be transmitted, two parallel signal... |
| 4639777 |
Apparatus for scrambling and descrambling communication signals |
| Jan-27-1987 |
Of the scrambling systems used in CATV and direct satellite broadcasting systems, the invention pertains to the transmission of a keying signal for demodulation. The keying signal, as a carrier wave displaced... |
| 4630112 |
Descrambling apparatus for a television signal |
| Dec-16-1986 |
In an apparatus for descrambling a scrambled television signal, an elastic surface wave filter is used. This elastic surface wave filter has an interdigital electrode having an electrode pattern similar... |
| 4621285 |
Protected television signal distribution system |
| Nov-4-1986 |
A television signal distribution system protects outgoing programs from unauthorized reception; and marks or tags the conveyed signals with a digital word identifying the class of viewers authorized to... |
| 4590519 |
Television signal scrambling/descrambling system |
| May-20-1986 |
An in-band television signal sync suppression scrambling system has two sync suppression modes which are aperiodically alternated. Horizontal and vertical synchronizing pulses are equally suppressed in... |
| 4589017 |
Pay television receiving system |
| May-13-1986 |
In a system for receiving a scrambled pay television signal wherein a radio frequency video signal with a horizontal synchronizing signal erased therefrom by elevating portions of the video signal containing... |
| 4567517 |
Descrambler for sync-suppressed TV signals |
| Jan-28-1986 |
Suppressed sync TV signals are descrambled by restoring their sync intervals with restoring pulses generated in predetermined time relationship with timing pulses which are transmitted with the TV signals,... |
| 4542407 |
Method and apparatus for scrambling and descrambling television programs |
| Sep-17-1985 |
A method for scrambling and descrambling television programs in which the horizontal synchronizing information is suppressed at a CATV supplier's head-end and then regenerated at the subscriber's converter.... |
| 4523228 |
Sync suppression scrambling of television signals for subscription TV |
| Jun-11-1985 |
Sync suppressed television signals transmitted with timing pulses in dynamically variable time delayed relationship with respect to the suppressed sync pulses are descrambled with a high degree of noise... |
