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Class Information
Number: 380/221
Name: Cryptography > Video cryptography > Video electric signal modification (e.g., scrambling) > By modifying synchronizing signal
Description: Subject matter which modifies a synchronizing component of the video signal.










Sub-classes under this class:

Class Number Class Name Patents
380/222 Including phase inversion of scan line information 33
380/224 Including pseudo-synchronizing pulse 39
380/226 Key signal in blanking interval 74
380/223 Key signal on separate carrier 83
380/225 Self-synchronizing circuit at receiver 58


Patents under this class:
1 2

Patent Number Title Of Patent Date Issued
8489403 Apparatuses, methods and systems for sparse sinusoidal audio processing and transmission Jul. 16, 2013
8477937 Methods and systems for providing interference based physical-layer encryption Jul. 2, 2013
8396215 Signal transmission apparatus and signal transmission method Mar. 12, 2013
8374489 Method and apparatus for inducing and or reducing geometric distortions in a display via positive going pulses Feb. 12, 2013
8365307 Method and apparatus for storing copy protection information separately from protected content Jan. 29, 2013
8320565 Method for generating downlink frame, and method for searching cell Nov. 27, 2012
8184812 Secure computing device with monotonic counter and method therefor May. 22, 2012
8094818 Method to synthesize video copy protection signals Jan. 10, 2012
7882357 System and method of retrieving a watermark within a signal Feb. 1, 2011
7844072 Watermark embedding and detection of a motion image signal Nov. 30, 2010
7840005 Synchronization of media signals Nov. 23, 2010
7802101 System and method of retrieving a watermark within a signal Sep. 21, 2010
7784103 Method and apparatus for storing copy protection information separately from protected content Aug. 24, 2010
7706533 Copy protection for video signal using narrowed horizontal synchronization signals Apr. 27, 2010
7664960 Password enhancing device Feb. 16, 2010
7620181 Communications system with minimum error cryptographic resynchronization Nov. 17, 2009
7620178 Copy protection for video signal added pulses Nov. 17, 2009
7583802 Method for using a synchronous sampling design in a fixed-rate sampling mode Sep. 1, 2009
7529941 System and method of retrieving a watermark within a signal May. 5, 2009
7492896 Copy protection for video signal using added negative amplitude pulse Feb. 17, 2009
7430585 Secure processing unit systems and methods Sep. 30, 2008
7403619 Interface module and decoder for host Jul. 22, 2008
7239702 Information recording/reproducing device Jul. 3, 2007
7155016 Communication device and method for using non-self-synchronizing scrambling in a communication system Dec. 26, 2006
7085380 Method for modifying a copy protected video signal with a negative amplitude pulse Aug. 1, 2006
7076538 Method and system for disguising a computer system's identity on a network Jul. 11, 2006
7065211 Signal reproducing/recording/transmitting method and apparatus and signal recording medium Jun. 20, 2006
7043019 Copy protection for digital motion picture image data May. 9, 2006
6980653 Signal reproducing/recording/transmitting method and apparatus and signal record medium Dec. 27, 2005
6944771 Method and apparatus for overcoming a watermark security system Sep. 13, 2005
6836549 Method and apparatus for synthesizing and reducing the effects of video copy protection signals Dec. 28, 2004
6731757 Multichannel digital signal generation method and apparatus May. 4, 2004
6711261 Enhancing concealment in the presence of fine mistuning for various TV scrambling techniques Mar. 23, 2004
6633982 Method and process for managing ultra secure electronic distribution of digital movies to commercial exhibitors Oct. 14, 2003
6618484 Steganographic techniques for securely delivering electronic digital rights management control information over insecure communication channels Sep. 9, 2003
6594361 High speed signal processing smart card Jul. 15, 2003
6529600 Method and device for preventing piracy of video material from theater screens Mar. 4, 2003
6501842 Method and apparatus for modifying a video signal by back porch lowering Dec. 31, 2002
6477253 Method and apparatus for television signal scrambling using vertical sync replacement Nov. 5, 2002
6459795 Method and apparatus for enhancing the scrambling of a TV signal via erroneous clamp signals Oct. 1, 2002
6449367 Steganographic techniques for securely delivering electronic digital rights management control information over insecure communication channels Sep. 10, 2002
6424716 Method and apparatus for improved horizontal and vertical overlay signals for greater concealment in modern TV sets Jul. 23, 2002
6404889 Protection of a component video signal Jun. 11, 2002
6295360 Method and apparatus to defeat composite video signal protection Sep. 25, 2001
6292567 Sync suppression television security system with addressable sync restoration Sep. 18, 2001
6240185 Steganographic techniques for securely delivering electronic digital rights management control information over insecure communication channels May. 29, 2001
6208737 Method and apparatus for television signal scrambling using the replacement of synchronizing and color subcarrier signals with an alternative time base inherent in a QPSK audio subcarrier Mar. 27, 2001
6192074 Fixed frequency source timing processor method and apparatus Feb. 20, 2001
6175630 Method and apparatus for level and phase control of a plurality of RF signals Jan. 16, 2001
6148320 Multichannel digital signal generation method and apparatus Nov. 14, 2000

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