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Class Information
Number: 380/226
Name: Cryptography > Video cryptography > Video electric signal modification (e.g., scrambling) > By modifying synchronizing signal > Key signal in blanking interval
Description: Subject matter wherein the signal needed to restore the modified synchronizing component is transmitted during a video retrace portion.

Patents under this class:
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Patent Number Title Of Patent Date Issued
8599457 Image processing device, method, system and the associated program for generating a composite image Dec. 3, 2013
8542829 Method of and apparatus for transmitting data Sep. 24, 2013
8478981 Method of adding a postscript message to an email Jul. 2, 2013
8339678 Apparatus, system, and method of process control based on the determination of embedded information Dec. 25, 2012
8335014 Image forming apparatus, control method, and program for copy-forgery-inhibited dot pattern calibration Dec. 18, 2012
8213050 Image processing device, method, system and the associated program for generating a composite image Jul. 3, 2012
8144368 Automated methods for distinguishing copies from original printed objects Mar. 27, 2012
8125691 Information processing apparatus and method, computer program and computer-readable recording medium for embedding watermark information Feb. 28, 2012
8089661 Embedding authentication information to prevent document spoofing Jan. 3, 2012
7965840 Data transmission and reception method and data transmission and reception device Jun. 21, 2011
7706533 Copy protection for video signal using narrowed horizontal synchronization signals Apr. 27, 2010
7673155 Microprocessor with improved task management and table management mechanism Mar. 2, 2010
7620178 Copy protection for video signal added pulses Nov. 17, 2009
7492896 Copy protection for video signal using added negative amplitude pulse Feb. 17, 2009
7352863 Copy protection for video signal using narrowed horizontal synchronization signals and amplitude modulation Apr. 1, 2008
7298850 Encrypting keypad module Nov. 20, 2007
7240366 End-to-end authentication of session initiation protocol messages using certificates Jul. 3, 2007
7233670 Signal tracing system and method Jun. 19, 2007
7185362 Method and apparatus for security in a data processing system Feb. 27, 2007
7043021 Digital video content transmission ciphering and deciphering method and apparatus May. 9, 2006
7023993 Signal reproducing/recording/transmitting method and apparatus and signal record medium for use with signals featuring a multiple-phase color burst Apr. 4, 2006
6819765 Video-signal output apparatus, video-signal input apparatus, and scramble method, and descramble method Nov. 16, 2004
6731758 Digital video content transmission ciphering and deciphering method and apparatus May. 4, 2004
6526510 Signal reproducing method and apparatus, signal recording method and apparatus and signal recording system Feb. 25, 2003
6072872 Determination of scrambling mode of a television signal Jun. 6, 2000
5870472 Dynamic relocation of the service data channel Feb. 9, 1999
5768377 Video signal descrambling apparatus Jun. 16, 1998
5671278 Video scrambling with variable function generator Sep. 23, 1997
5651065 Insertion of supplemental burst into video signals to thwart piracy and/or carry data Jul. 22, 1997
5539823 Subscription television picture scrambling and descrambling system providing compatibility with different such systems Jul. 23, 1996
5287409 Method and apparatus for frustrating vertical interval detection in scrambled television signals Feb. 15, 1994
5272751 Pay television Dec. 21, 1993
5166976 System and method for detection of a pulse within a video signal Nov. 24, 1992
5161187 Cable television system Nov. 3, 1992
5113440 Universal decoder May. 12, 1992
5113441 Method for scrambling a television signal and method and apparatus for descrambling a scrambled television signal May. 12, 1992
5103477 Method and apparatus for descrambling a television signal Apr. 7, 1992
5063594 Video signal scrambling system Nov. 5, 1991
5060262 Video scrambling, audio masking and data transmission methods for wireless cable systems Oct. 22, 1991
5022079 Lock means and TV sync for air-to-surface missile Jun. 4, 1991
4962529 Scrambling method for TV picture Oct. 9, 1990
4953208 CATV system transmitting a scrambled television signal Aug. 28, 1990
4885776 Television signal encoder with reduced transient switching effects Dec. 5, 1989
4817144 Secure TV scrambling system using framing code switching Mar. 28, 1989
4815129 Video encryption system Mar. 21, 1989
4807285 Method and apparatus for scrambling a television signal Feb. 21, 1989
4802214 Method and apparatus for identifying and rendering operative particular descramblers in a television signal scrambling system Jan. 31, 1989
4794643 Method for developing a key signal for descrambling in television broadcasting Dec. 27, 1988
4706283 Television signal scrambling system Nov. 10, 1987
4706284 Television signal data transmission system Nov. 10, 1987

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