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Class Information
Number: 380/208
Name: Cryptography > Video cryptography > Video electric signal masking > Including filter for removing masking signal
Description: Subject matter wherein an electronic circuit eliminates the interfering signal.

Patents under this class:
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Patent Number Title Of Patent Date Issued
8645281 Process for authenticating an end user Feb. 4, 2014
8467525 Steganographic method and device Jun. 18, 2013
8150034 Method and system for transmitting data from a first data processing device to a second data processing device Apr. 3, 2012
8064457 System and method for filtering a data packet using a common filter Nov. 22, 2011
7900264 Multimedia client/server system with copy protection recovery and methods for use therewith Mar. 1, 2011
7870393 Steganographic method and device Jan. 11, 2011
7853121 Recording medium, reproduction device, program, and reproduction method Dec. 14, 2010
7817902 Apparatus and method of generating video-reproducing clock signal from 480p signal Oct. 19, 2010
7568100 Steganographic method and device Jul. 28, 2009
7403617 System and method for copy protection for digital signals Jul. 22, 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
7218737 System and method for an adaptive state machine to control signal filtering in a serial link May. 15, 2007
7117128 Method and apparatus for digital signal filtering Oct. 3, 2006
6654887 Steganography decoding methods employing error information Nov. 25, 2003
6557103 Spread spectrum image steganography Apr. 29, 2003
6425082 Watermark applied to one-dimensional data Jul. 23, 2002
6292567 Sync suppression television security system with addressable sync restoration Sep. 18, 2001
6272634 Digital watermarking to resolve multiple claims of ownership Aug. 7, 2001
5450454 Coding and decoding a modulated radio frequency signal Sep. 12, 1995
5446795 Universal decoder for television signal scramble systems Aug. 29, 1995
5303295 Enhanced versatility of a program control by a combination of technologies Apr. 12, 1994
5282248 Time limited signal conduction system Jan. 25, 1994
5249228 Cable television signal scrambling system Sep. 28, 1993
5235640 Master decoder for television signal scramble systems Aug. 10, 1993
5233652 Selective off-premises jamming for premium CATV service Aug. 3, 1993
5208854 Picture carrier controlled automatic gain control circuit for cable television interdiction or jamming apparatus May. 4, 1993
5068893 Television signal processing network for subscription television jamming signals Nov. 26, 1991
5027399 Signal switching apparatus Jun. 25, 1991
4939779 Temperature compensated trap filter Jul. 3, 1990
4903297 Restricted access television transmission system Feb. 20, 1990
4841569 Secure video distribution system Jun. 20, 1989
4827509 CATV receiver May. 2, 1989
4825467 Restricted access television transmission system Apr. 25, 1989
4748667 Jamming signal scrambling and descrambling systems for CATV May. 31, 1988
4633309 Cable television master/slave decoder control Dec. 30, 1986
4623918 Pay television system utilizing multi-frequency passive filters Nov. 18, 1986
4623919 Method and system for controlling access to transmitted modulated electromagnetic wave carried information Nov. 18, 1986
4580161 Cable television subscriber control system including addressable filters having a variable pole Apr. 1, 1986
4575753 Method of and apparatus for scrambling and decoding television and similar signals with wobbulating trapping Mar. 11, 1986
4567516 Special program decoding of scrambled subscription television transmissions Jan. 28, 1986
4398214 Wired television broadcasting system Aug. 9, 1983
4286288 Apparatus and method for tamper resistant channel attenuation in subscription television converter Aug. 25, 1981
4272791 Method and apparatus for video recording Jun. 9, 1981
4268860 Television subscriber apparatus May. 19, 1981
4222066 CATV Subscription service control device and attenuator therefor Sep. 9, 1980
4222067 Tamper-resistant television signal scrambling Sep. 9, 1980
4099203 Television signal scrambling with introduction of replacement program signals Jul. 4, 1978
4097894 Secured scramble decoder filter Jun. 27, 1978
4091413 Security system for pay-TV channel May. 23, 1978
4074311 Television security system Feb. 14, 1978

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