| 6560339 |
Electronic watermarking method, digital information distribution system using such method, and storage medium storing program of such method |
| May-6-2003 |
An electronic watermarking method includes the steps of generating a plurality piece of information with different electronic watermark information, generating a plurality piece of encrypted information... |
| 6922780 |
Dual chip smart card and method for using same |
| Jul-26-2005 |
A smart card is provided comprising a first processor and a second processor. The first and second processors are capable of decoding a scrambled broadcast signal. The first processor is activated by a... |
| 6055315 |
Distributed scrambling method and system |
| Apr-25-2000 |
A scrambling system for a cable television system in which a group of channel frequencies are reused over a plurality of service areas includes an access controller, an encoder and a plurality of simplified... |
| 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... |
| 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... |
| 6408076 |
Digital video broadcasting |
| Jun-18-2002 |
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... |
| 6178242 |
Digital recording protection system |
| Jan-23-2001 |
A system for producing an output scrambled digital data stream from an input scrambled digital data stream. The input scrambled digital data stream includes a plurality of control messages (ECMs), each... |
| 4613900 |
Digital code reading apparatus and method |
| Sep-23-1986 |
A digital code reader reads the digital key code in a scrambled video signal. The key code represents the scheme used to scramble the signal before broadcasting and is used by the video receiver to unscramble... |
| 6690797 |
Descrambling device for the use of several conditional access sub-systems |
| Feb-10-2004 |
The descrambling device comprises hardware resources (1) and first memory zones (CA1, CA2, . . . , CAn) to store at least two different access control codes for controlling the hardware resources. The... |
| 5790666 |
Decryptor |
| Aug-4-1998 |
A decryptor includes a descrambler for descrambling the scrambled signals using a PN signal, a PN generator which shifts the state successively from its initial state setup by a scramble-key, generates... |
| 5878135 |
Decoding system for processing encrypted broadcast, cable or satellite video data |
| Mar-2-1999 |
A decoder excludes an encryption code or key from decrypted or non-decrypted program output data. Decrypted program representative data is generated from an input datastream containing encrypted program... |
| 6016348 |
Decoding system and data format for processing and storing encrypted broadcast, cable or satellite video data |
| Jan-18-2000 |
A decoder conditional access system incorporates different encryption systems for providing access to programs derived from different sources. A conditional access processor for processing encrypted program... |
| 6215745 |
Decoding key recorded at a recording site in order to decode information transmitted to that site is encoded with information specific to the recording site |
| Apr-10-2001 |
A data recording apparatus capable of preventing easily copying of information is disclosed with which, even if information is copied, the copied information cannot be reproduced, the data recording apparatus... |
| 5787171 |
Data transmitter and receiver |
| Jul-28-1998 |
A data transmitter capable of preventing illegal free reception of transmitted data by scrambling the same, and a data receiver adapted to descramble the received data properly despite any alteration of... |
| 5627892 |
Data security scheme for point-to-point communication sessions |
| May-6-1997 |
Secure point-to-point communication of information to specific terminals is provided via a shared network. Far in advance of the establishment of an information session with a particular one of a plurality... |
| 7023992 |
Data multiplexing device, program distribution system, program transmission system, pay broadcast system, program transmission method, conditional access system, and data reception device |
| Apr-4-2006 |
In a data multiplexing device which multiplexes and transmits the transport stream packets of program data consisting of a plurality of data elements constructed in the form of transport stream packets,... |
| 6741991 |
Data management system |
| May-25-2004 |
To prevent piracy or leakage of data content, a cryptography technique and electronic watermark technique are combined together and used. In a data content supplied to a user, a user data is entered as... |
| 4514761 |
Data encryption technique for subscription television system |
| Apr-30-1985 |
A subscription television system includes a head-end for transmitting selected fields of a television signal in a scrambled form, the scrambled fields being identified by an encrypted mode control code... |
| 4989244 |
Data encripting transfer |
| Jan-29-1991 |
A data encripting transfer system includes a scanner for scanning an object to output an image signal, a data encripting device for encripting the image signal, and a data decoder for decoding the encripted... |
| 6996722 |
Data communications |
| Feb-7-2006 |
In a data communications system a remote data source outputs data as a series of application data units (ADUs). Each ADU is individually encrypted with a different key. The keys are transmitted (for example... |
| 4694491 |
Cryptographic system using interchangeable key blocks and selectable key fragments |
| Sep-15-1987 |
A cryptographic system is used for the secure transmission of digitized signals to a plurality of receivers. At the transmission end, a key consisting of two blocks, each including a plurality of key fragments,... |
| 4887296 |
Cryptographic system for direct broadcast satellite system |
| Dec-12-1989 |
A three key cryptographic system is used in the transmission of digitized signals to a plurality of receivers, each having a unique address number and a factory stored signature key which is a function... |
| 6735312 |
Cryptographic method for restricting access to transmitted programming content using .function.-redundant establishment key combinations |
| May-11-2004 |
A method for encrypting programming in which a controlled number of unintended recipients of a broadcast are allowed to view a program so that a set of encryption keys can be found which enables a broadcaster... |
| 6373948 |
Cryptographic method and apparatus for restricting access to transmitted programming content using program identifiers |
| Apr-16-2002 |
A system for restricting access to transmitted programming content is disclosed, which transmits a program identifier with the encrypted programming content. A set-top terminal or similar mechanism restricts... |
| 6097816 |
Crypt key system |
| Aug-1-2000 |
A crypt key system for decrypting encrypted data for use, by a permit key including a decryption key, comprising a database/charging center, a broadcasting station, a receiving device and a communication... |
| 5138659 |
Conversion of television signal formats with retention of common control data stream |
| Aug-11-1992 |
Television signals are converted from a first format to a plurality of different formats while retaining a common control data stream. A first television signal in a first format is separated into a first... |
| 6216228 |
Controlling video or image presentation according to encoded content classification information within the video or image data |
| Apr-10-2001 |
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... |
| 6832319 |
Content guard system for copy protection of recordable media |
| Dec-14-2004 |
A system and method for enabling broadcast programs to be copied once only by consumer recorders includes writing a unique media identification on each blank disk to which content is to copied in a read-only... |
| 6633644 |
Conditional access system for controlling the access to a data content |
| Oct-14-2003 |
A conditional access system for controlling the access of receivers of end-users to data content transmitted from a data content source in an uplink system. The uplink system scrambles the content supplied... |
| 6920222 |
Conditional access system enabling partial viewing |
| Jul-19-2005 |
A conditional access system includes an EMM (Entitlement Management Message) analyzer for retrieving partial viewing authorization information. When the partial viewing authorization information permits... |
| 6035038 |
Conditional access system and smartcard allowing such access |
| Mar-7-2000 |
The conditional access system of the present invention allows a service provider to supply services, which may be scrambled by a control word, only to those users who have acquired entitlements to these... |
| 6510519 |
Conditional access system |
| Jan-21-2003 |
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 step top... |
| 6069647 |
Conditional access and content security method |
| May-30-2000 |
A system featuring an interface unit connected to a programmable unit is described. The interface unit is capable of containing a time-sensitive key. The programmable unit is allowed to receive digital... |
| 4829569 |
Communication of individual messages to subscribers in a subscription television system |
| May-9-1989 |
A subscription television system in which individual decoders are enabled to receive individually addressed messages is disclosed. The composite signal, including video and teletext, also comprises addressed... |
| 6883097 |
Coincidence-free media key block for content protection for recordable media |
| Apr-19-2005 |
A system for protecting content on recordable media for, e.g., DVD audio disks, flash memory media, or other media includes providing a media key block (MKB) on each media, with each MKB including 25,000... |
| 5204900 |
Coding system for descrambling video |
| Apr-20-1993 |
A system for scrambling and descrambling complex signals, such as video signals, employs a system for encoding the decoding information, in the form of two security keys, directly onto the scrambled signal... |
| 5345505 |
Coding system for a data signal |
| Sep-6-1994 |
A system for scrambling and descrambling complex data signals, such as video signals, employs a system for encoding the decoding information, in the form of two security keys, directly onto the scrambled... |
| 4533948 |
CATV Communication system |
| Aug-6-1985 |
A two way digital communication arrangement utilizes a CATV system to provide bidirectional data transport service between any two points within the CATV system. The headend receives an upstream message... |
| 5675647 |
Cable TV system using passwords |
| Oct-7-1997 |
This invention relates to a method of distributing signals to valid subscribers comprised of storing subscriber terminal valid identification codes at a central station, broadcasting promotions of services... |
| 4700387 |
Broadcast system for scrambled programming signals |
| Oct-13-1987 |
A pay program signal is scrambled in an exclusive OR circuiit by a scrambling signal (Ks) derived from a random number generator. The pay program signal is converted into a broadcasting signal by a converter.... |
| 6510515 |
Broadcast service access control |
| Jan-21-2003 |
Techniques and systems for controlling access to information broadcast over point-to-multipoint resources in radiocommunication systems are described. These techniques can be used to provide controllable... |
| 6490356 |
Broadcast receiving system comprising a computer and a decoder |
| Dec-3-2002 |
A combined computer and decoder system for receiving broadcast digital data transmissions, characterized in that the decoder (2020) comprises a routing means (2032), broadcast digital data received at... |
| 5999623 |
Broadcast data access controller communication system |
| Dec-7-1999 |
Disclosed is a method and apparatus for enabling an authorized receiver station to decrypt encrypted information broadcast by a transmitter station, and for decrypting the information within the authorized... |
| 6070245 |
Application interface method and system for encryption control |
| May-30-2000 |
A system and method is provided whereby a system or application programmer may control encryption on or off during a connection oriented session between a client and a server over the Internet/intranet.... |
| 6748080 |
Apparatus for entitling remote client devices |
| Jun-8-2004 |
A master-receiver in a subscriber television network receives service instances and entitlement information from a headend of the subscriber television network and re-transmits service instances to a client-receiver... |
| 5144664 |
Apparatus and method for upgrading terminals to maintain a secure communication network |
| Sep-1-1992 |
A secure communication network serves a plurality of terminals grouped into different security categories. Each terminal includes a replaceable security element containing a security algorithm specific... |
| 6907125 |
Apparatus and method for processing information and correcting an error in a decrypted error correction code |
| Jun-14-2005 |
An apparatus and method for processing information, including an error-correcting coding device for encoding information data into at least one error-correcting code, the error-correcting code containing... |
| 4654704 |
Analog television with regenerable and encryptable signals |
| Mar-31-1987 |
Novel means are disclosed for conditioning a standard color-television composite signal, such as the NISC composite, so that pictorial information is represented according to Nyquist samples which are... |
| 5933500 |
Adaptive decoding system for processing encrypted and non-encrypted broadcast, cable or satellite video data |
| Aug-3-1999 |
An adaptive decoder generates a program representative datastream, in selectable, encrypted or decrypted form. A method for adaptively processing input encrypted program data with an associated encryption... |
