| 6178506 |
Wireless subscription portability |
| Jan-23-2001 |
A short Personal Identification Number (PIN) is used to transfer a subscription for wireless service to a new wireless terminal 104, thereby providing enhanced personal mobility to the subscriber. The... |
| 6477431 |
Watermark detection |
| Nov-5-2002 |
A method and arrangement for detecting a watermark in an information signal. The method may include the steps of computing the correlation (d.sub.k) of the watermark (W.sub.i) and the information signal... |
| 6819765 |
Video-signal output apparatus, video-signal input apparatus, and scramble method, and descramble method |
| Nov-16-2004 |
A system, which includes a video-signal output apparatus and a video-signal input apparatus, has a construction in which scrambling or descrambling is performed with a scramble key generated using copy-control... |
| 5014310 |
Video scrambling and descrambling by varying sequence of segments in adjacent video information lines |
| May-7-1991 |
A video scrambling system scrambles adjacent sequentially odd and even video information lines of a video frame by simultaneously storing in a memory a pair of such adjacent lines; and forming a pair of... |
| 6853728 |
Video on demand pay per view services with unmodified conditional access functionality |
| Feb-8-2005 |
A system and method for storing and retrieving program material for subsequent replay is disclosed. The method comprises the steps of receiving access control information and the program material encrypted... |
| 4991208 |
Video control system having session encryption key |
| Feb-5-1991 |
A video system includes a central facility and a terminal. Video program means for provides the terminal with a video program including a series of television fields including a first field containing... |
| 5046092 |
Video control system for transmitted programs |
| Sep-3-1991 |
A video system includes a central facility and a terminal. Means are provided for transmitting to the terminal a video program including a series of television fields including a first field containing... |
| 5054064 |
Video control system for recorded programs |
| Oct-1-1991 |
A video system includes a central facility and a terminal. Means are provided for playing a video recording medium storing a video program including a series of television fields including a first field... |
| 6105134 |
Verification of the source of program information in a conditional access system |
| Aug-15-2000 |
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... |
| 6937728 |
Verifiable anonymous channel |
| Aug-30-2005 |
Two El Gamal ciphertexts, which are input to a two-input two-output unit switching gates SW forming a permutation network, are randomized with a random number and randomly permuted, and a zero-knowledge... |
| 6850909 |
Using smartcards to enable probabilistic transactions on an untrusted device |
| Feb-1-2005 |
The present invention permits a user to conduct remote transactions without a network while using an untrusted computing device, such as a hand-held personal digital assistant or a laptop computer. The... |
| 4531021 |
Two level encripting of RF signals |
| Jul-23-1985 |
A system for enciphering information bearing RF signals in digital form utilizes a first key common to all receivers. There are means to change the first key which means include, at the transmitter, means... |
| 4636854 |
Transmission system |
| Jan-13-1987 |
In a television receiver for a transmission system in which the video signal is scrambled to allow only for its authorized reception, a video signal processor (8) is provided in which the scrambled video... |
| 5991400 |
Time-shifted conditional access |
| Nov-23-1999 |
In a conditional access system, transmitted information is recorded in a scrambled form SV. Accordingly, any access to the recorded information SV is subject to the condition that proper control word(s)... |
| 4464678 |
Time window key system for video scrambling |
| Aug-7-1984 |
A video scrambling device requires that a key signal be periodically inserted into a subscribers box, e.g. once a month. The key signal is a function of both the box number and the time, and thus once... |
| 4337483 |
Text video-transmission system provided with means for controlling access to the information |
| Jun-29-1982 |
A text video-transmission system comprising an information emitting center and receiving stations, the emitting center comprising encryption means using an operating key, each receiving station comprising... |
| 4651205 |
Television transmission system |
| Mar-17-1987 |
In a television receiver for a transmission system in which the video signal is scrambled to allow only for its authorized reception, a video signal processor (8) is provided in which the scrambled video... |
| 4354201 |
Television system with access control |
| Oct-12-1982 |
A television system with access control comprises a transmitter and receis. The transmitter comprises a video signal and sound signal formation circuit, means for transmitting these signals and a jamming... |
| 4995080 |
Television signal scrambling system and method |
| Feb-19-1991 |
A method of operating a pay per view (PPV) television system includes transmitting global data packets alternately encrypted with two different session keys. Subscriber terminals store three session keys,... |
| 6886098 |
Systems and methods for compression of key sets having multiple keys |
| Apr-26-2005 |
Systems, methods and a modulated data signal are described herein that provide an efficient way to derive a single key from which a user can extract virtually any number of data encryption keys. A database... |
| 5680457 |
System for updating an authorization memory |
| Oct-21-1997 |
A subscriber terminal includes a digital conditional access module receiving a transport bitstream comprising a plurality of multiplexed conditional access and product packets. Selected ones of the conditional... |
| 4323921 |
System for transmitting information provided with means for controlling access to the information transmitted |
| Apr-6-1982 |
A system for transmitting information between an emitting center and receiving stations, comprising: a subscription administration center generating a plurality of subscriber's keys C.sub.i changing randomly... |
| 5974144 |
System for encryption of partitioned data blocks utilizing public key methods and random numbers |
| Oct-26-1999 |
A method for encryption wide-bandwidth video, using a first processor for encrypting the video and a second processor for decrypting the video. Data is taken in blocks. A block of data is scrambled to... |
| 6650753 |
System for encrypting broadcast programs in the presence of compromised receiver devices |
| Nov-18-2003 |
A digital broadcast system provides secure transmission of digital programs to in-home digital devices even when some of the devices are unauthorized. A matrix of device keys S.sub.j,i is provided, wherein... |
| 6118873 |
System for encrypting broadcast programs in the presence of compromised receiver devices |
| Sep-12-2000 |
A digital broadcast system provides secure transmission of digital programs to in-home digital devices even when some of the devices are unauthorized. A matrix of device keys S.sub.j,i is provided, wherein... |
| 4736421 |
System for displaying the subscription state of a pay broadcasting program |
| Apr-5-1988 |
A program data (ATji) corresponding to a scrambled pay program signal, subscribed program data (BTji) representing a program signal subscribed by a subscriber and the scrambled program signal are demodulated... |
| 6393128 |
System for broadcasting data signals in a secure manner |
| May-21-2002 |
A system for broadcasting data signals in a secure manner comprises means for encrypting the data signals using a first key, means for broadcasting the encrypted data signals to subscribers, means for... |
| 6393126 |
System and methods for generating trusted and authenticatable time stamps for electronic documents |
| May-21-2002 |
A trusted time infrastructure system provides time stamps for electronic documents from a local source. The system comprises a trusted master clock, a trusted local clock, and a network operations center.... |
| 5091938 |
System and method for transmitting entertainment information to authorized ones of plural receivers |
| Feb-25-1992 |
An audiovisual subscription system includes means for aperiodically inverting the lines of a transmitted video signal on a frame-by-frame basis and for decrypting encrypted PCM audio information which... |
| 7016496 |
System and method for storing and accessing digital media content using smart card technology |
| Mar-21-2006 |
A system and method for delivering digital media content to a user over a network is disclosed. The illustrative embodiment of the present invention enables multiple types of electronic devices to access... |
| 6055314 |
System and method for secure purchase and delivery of video content programs |
| Apr-25-2000 |
A system and method for secure purchase and delivery of video content programs over various distribution media, including distribution networks and digital video disks, includes an integrated circuit card... |
| 5185794 |
System and method for scrambling and/or descrambling a video signal |
| Feb-9-1993 |
An audiovisual subscription system includes means for aperiodically inverting the lines of a transmitted video signal on a frame-by-frame basis and for decrypting encrypted PCM audio information which... |
| 5872846 |
System and method for providing security in data communication systems |
| Feb-16-1999 |
A system and method for providing security in data communication systems where multiple users are coupled to a common receiving system. The data is encrypted or otherwise encoded by a sender using a key.... |
| 5734720 |
System and method for providing digital communications between a head end and a set top terminal |
| Mar-31-1998 |
A system and method for scheduling the receipt of desired movies and other forms of data from a network. Feedback paths are provided so that customer's profiles and/or the profiles of the video programs... |
| 6901516 |
System and method for ciphering data |
| May-31-2005 |
A system for ciphering data for transmission by a communication device is provided. The system includes a memory device having a memory buffer a first access port connected to the memory buffer and a second... |
| 5557678 |
System and method for centralized session key distribution, privacy enhanced messaging and information distribution using a split private key public cryptosystem |
| Sep-17-1996 |
A encryption method and system using split key public encryption. A first and second user private encryption key and a corresponding first and second user public encryption key are generated. The first... |
| 5539823 |
Subscription television picture scrambling and descrambling system providing compatibility with different such systems |
| Jul-23-1996 |
Video signal scrambling and descrambling methods and apparatus for a subscription TV system are provided which are compatible with other equipment operating in accordance with pre-existing modes of signal... |
| 7039189 |
Stream continuity enforcement |
| May-2-2006 |
A system for enforcing data stream continuity, in accordance with the present invention, includes a server coupled to a transmission link for providing a data stream to at least one client over the transmission... |
| 7043020 |
Smartcard for use with a receiver of encrypted broadcast signals, and receiver |
| May-9-2006 |
A smartcard for use with a receiver of encrypted broadcast signals comprises a microprocessor for enabling or controlling decryption of said signals. A memory is coupled to the microprocessor. The microprocessor... |
| 6691228 |
Signal reproducing/recording/transmitting method and apparatus and signal recording medium |
| Feb-10-2004 |
A signal reproducing apparatus for prohibiting copying or unauthorized use. The apparatus includes a copying management information decision circuit 19 for discriminating the state of the copying management... |
| 6108423 |
Signal reproducing/recording/transmitting method and apparatus and signal record medium |
| Aug-22-2000 |
A signal reproducing apparatus for prohibiting copying or unauthorized use. The apparatus includes a copying management information decision circuit 19 for discriminating the state of the copying management... |
| 4613901 |
Signal encryption and distribution system for controlling scrambling and selective remote descrambling of television signals |
| Sep-23-1986 |
A system and method for scrambling and selectively descrambling television signals that are transmitted to subscribers' descramblers in a subscription television system. A working key signal is generated... |
| 4712238 |
Selective-subscription descrambling |
| Dec-8-1987 |
A system in a subscriber television network for enabling descrambling of a received scrambled signal on a prepaid basis and/or an impulse-purchase basis. A received mask signal uniquely related to the... |
| 4792973 |
Selective enablement of descramblers |
| Dec-20-1988 |
A system in a subscriber television network for enabling descrambling of a received scrambled signal on a prepaid basis and/or an impulse-purchase basis. A received mask signal uniquely related to the... |
| 4802215 |
Security system for television signal encryption |
| Jan-31-1989 |
A conditional access system for over-air transmission and reception of scrambled television signals improves the reliability of the reception by transmitting a key signal for use in descrambling the television... |
| 4484027 |
Security system for SSTV encryption |
| Nov-20-1984 |
In a secure communications system, a key number which is changed periodically, e.g. monthly, and a random number from a random number generator are combined and used as a seed to reset a PN sequence generator,... |
| 5151938 |
Security enhancement in a data processor through use of dynamic parameter authentication |
| Sep-29-1992 |
A descrambler for descrambling scrambled information signals through use of a predetermined decryption key. The processing means are adapted for processing data in accordance with a number of different... |
| 5018197 |
Secure video decoder system |
| May-21-1991 |
A video decoder includes an application specific integrated circuit (ASIC) that has the decoder address and a secure decryption key stored in a one-time-programmable memory. Encrypted messages are received... |
| 4944006 |
Secure data packet transmission system and method |
| Jul-24-1990 |
A bit packet communication system includes a head-end having a software implemented 16 bit shift register with a plurality of feed-forward taps and a different plurality of feedback taps for simultaneously... |
| 4771458 |
Secure data packet transmission system and method |
| Sep-13-1988 |
A bit packet communication system includes a head end having a software implemented 16 bit shift register with a plurality of feed-forward taps and a different plurality of feedback taps for simultaneously... |
