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Class Information
Number: 380/206
Name: Cryptography > Video cryptography > Video electric signal masking > Masking of synchronization signal
Description: Subject matter wherein the interfering signal is combined with the video electric signal to obscure a scanning time component.

Patents under this class:
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Patent Number Title Of Patent Date Issued
8571213 Security method for preventing the unauthorized use of multimedia contents Oct. 29, 2013
8565426 System and method for copy protection for digital signals Oct. 22, 2013
8553881 Composite masking system and method for improving invisibility of high-definition video watermarking Oct. 8, 2013
8477937 Methods and systems for providing interference based physical-layer encryption Jul. 2, 2013
8472623 Content data, transmitting apparatus, receiving apparatus and decoding method Jun. 25, 2013
8204929 Hiding sensitive information Jun. 19, 2012
8135963 Program conversion device and program execution device Mar. 13, 2012
8094818 Method to synthesize video copy protection signals Jan. 10, 2012
7853121 Recording medium, reproduction device, program, and reproduction method Dec. 14, 2010
7843974 Audio and video synchronization Nov. 30, 2010
7817902 Apparatus and method of generating video-reproducing clock signal from 480p signal Oct. 19, 2010
7664263 Method for combining transfer functions with predetermined key creation Feb. 16, 2010
7471714 Random number sequence sharing system, random number sequence sharing apparatus, codec system, coding apparatus, decoding apparatus, random number sequence sharing method, coding method, decod Dec. 30, 2008
7391866 Broadcast apparatus and reception apparatus for providing a storage service by which scrambled content is stored and descrambled using scrambling key list Jun. 24, 2008
7325145 Verifying the presence of an original data storage medium Jan. 29, 2008
7317797 Seamless switching between multiple pre-encrypted video files Jan. 8, 2008
7103184 System and method for sign mask encryption and decryption Sep. 5, 2006
7043022 Packet order determining method and apparatus May. 9, 2006
6925342 System and method for protecting digital media Aug. 2, 2005
6839433 Method and apparatus for generating a signal that defeats illegal cable decoders Jan. 4, 2005
6792111 Cryptation system for packet switching networks based on digital chaotic models Sep. 14, 2004
6477431 Watermark detection Nov. 5, 2002
6408076 Digital video broadcasting Jun. 18, 2002
6330333 Cryptographic system for wireless communications Dec. 11, 2001
6240184 Password synchronization May. 29, 2001
6216228 Controlling video or image presentation according to encoded content classification information within the video or image data Apr. 10, 2001
6148320 Multichannel digital signal generation method and apparatus Nov. 14, 2000
6061793 Method and apparatus for embedding data, including watermarks, in human perceptible sounds May. 9, 2000
5754650 Simultaneous multichannel television access control system and method May. 19, 1998
5682426 Subscriber site method and apparatus for decoding and selective interdiction of television channels Oct. 28, 1997
5430799 Multichannel television signal scrambling and descrambling system and method Jul. 4, 1995
RE34720 Television signal enhancement and scrambling system Sep. 6, 1994
5091935 Method and system for scrambling information signals Feb. 25, 1992
5022078 Television signal enhancement and scrambling system Jun. 4, 1991
4920566 Dual loop sinewave descrambler and method of descrambling Apr. 24, 1990
4790010 Enhanced scrambling method and system for TV signals Dec. 6, 1988
4731838 AGC circuit used in a CATV receiver Mar. 15, 1988
4589016 FM television signal receiving circuit May. 13, 1986
4581637 PIN diode modulator Apr. 8, 1986
4568974 Video scrambling by the application of a variable periodic scrambling waveform Feb. 4, 1986
4489347 Sine-wave decoding technique Dec. 18, 1984
4454543 Dynamic video scrambling Jun. 12, 1984
4447828 Phase change dynamic scrambling May. 8, 1984
4353088 Coding and decoding system for video and audio signals Oct. 5, 1982
4336553 Method of coding audio and video signals Jun. 22, 1982
4330794 Multichannel subscription television system May. 18, 1982
4313133 Scrambling and descrambling system in CATV broadcasting system Jan. 26, 1982
4148064 Jamming circuit for television signals Apr. 3, 1979
4145716 Descrambling device in CATV system Mar. 20, 1979
4145717 Subscription TV audio carrier recovery system Mar. 20, 1979

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