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8774406 Masking addition operation device for prevention of side channel attack  
A masking addition operation apparatus for prevention of a side channel attack, includes a random value generation unit generating a first random value for a first input, second random value for a...
8571213 Security method for preventing the unauthorized use of multimedia contents  
A method embeds tracing secret data into multimedia contents delivered to particular users. The method descrambles a first scrambled video stream having alternate values to obtain a personalized...
8565426 System and method for copy protection for digital signals  
Embodiments of the present invention provide for the copy protection of distributed material after conditional access is applied, regardless of where the material is distributed. The solutions...
8553881 Composite masking system and method for improving invisibility of high-definition video watermarking  
A composite masking system and method for improving the invisibility of high-definition video watermarking. The composite masking system includes a watermark generation module, a mask generation...
8477937 Methods and systems for providing interference based physical-layer encryption  
A method for encrypting an information carrier comprising generating a sequence of data using a sequence generator, modulating, using a first modulator an output from the sequence generator such...
8472623 Content data, transmitting apparatus, receiving apparatus and decoding method  
A transmitting apparatus 100 includes an initialization vector generating unit 110 for generating initialization vector IV1-IV5 for encrypting stream data with a stream encryption method, wherein...
8204929 Hiding sensitive information  
An improved methodology and implementing computer system are provided in which sensitive information is selectively masked in order to enable such information to be relatively securely and...
8135963 Program conversion device and program execution device  
A program conversion device generates a program by obfuscating an original program, and generates and encrypts conversion parameters for inverse conversion of the obfuscated program. The program...
8094818 Method to synthesize video copy protection signals  
A method and apparatus for defeating copy protection signals in a video signal, and also for providing copy protection signals for a video signal, is disclosed. The defeat technique generally...
7853121 Recording medium, reproduction device, program, and reproduction method  
A BD-ROM stores a video stream and a plurality of pieces of copy control information. The plurality of pieces of copy control information include “CCIforHD with CM”, “CCIforSD with CM”, “CCIforHD...
7843974 Audio and video synchronization  
The present invention relates to media synchronization. The invention is mainly addressed to synchronization of continuous media streams that are provided in data transfer systems. In a sending...
7817902 Apparatus and method of generating video-reproducing clock signal from 480p signal  
An apparatus and a method of generating a video-reproducing clock signal from a 480p signal. The apparatus generates a video-reproducing clock signal from a 480p signal that includes a vertical...
7664263 Method for combining transfer functions with predetermined key creation  
A method for combining transfer functions with predetermined key creation. In one embodiment, digital information, including a digital sample and format information, is protected by identifying...
7471714 Random number sequence sharing system, random number sequence sharing apparatus, codec system, coding apparatus, decoding apparatus, random number sequence sharing method, coding method, decoding method, and program product  
In a random number sequence sharing apparatus, a reception unit receives a radio signal including a radio wave from a pre-designated radio star at a pre-designated observation time, a sending unit...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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,...
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...
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...
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...
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...
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....
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...
RE34720 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,...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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,...
4336553 Method of coding audio and video signals  
An audio and video signal coding system in which the normal sync pulses in the horizontal and vertical blanking intervals are suppressed, and clock and control data as well as digital audio data...
4330794 Multichannel subscription television system  
Sinusoidal timing reference signals, each of which is associated with a different suppresed-sync scrambled-priority television channel signal, frequency modulate associated carrier frequency...
4313133 Scrambling and descrambling system in CATV broadcasting system  
Scrambling of the television signal in a CATV broadcasting system is effected by modulating the audio signal with a pilot signal, and modulating both the audio and video with a scrambling signal...
4148064 Jamming circuit for television signals  
A circuit for transmitting a jamming signal for disruption of a television signal transmitted along a cable or other guided path toward a television receiver, the circuit having a first oscillator...
4145716 Descrambling device in CATV system  
A descrambler system for a CATV television signal having IF audio, video and synchronizing components that is scrambled by a first amplitude modulation of the IF audio component and a second...
4145717 Subscription TV audio carrier recovery system  
A subscription TV decoder for processing encoded audio and video signals in which the TV program audio information is received as an audio subcarrier includes means for decoding the video signal,...
4095258 Apparatus for decoding scrambled television and similar transmissions  
This disclosure deals with a novel scrambled television decoding system for modulation-suppressed trains of synchronizing signals at a predetermined line rate, in which the demodulating circuits...
4064536 Video scrambler and descrambler apparatus  
Video signals for television are effectively scrambled and may later be descrambled without the presence of annoying visual disturbances by the introduction of a superposed distorted sine wave in...

Matches 1 - 50 out of 54 1 2 >