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Class Information
Number: 380/218
Name: Cryptography > Video cryptography > Video electric signal modification (e.g., scrambling) > Variable time delay modulation of baseband video signal
Description: Subject matter which modifies a picture signal before carrier modulation by application of varying amounts of time delay.










Patents under this class:
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Patent Number Title Of Patent Date Issued
8571217 Display system, control apparatus, display method, and program Oct. 29, 2013
8566868 Signal processing apparatus and methods Oct. 22, 2013
8213522 Digital broadcast receiving apparatus, semiconductor integrated circuit, and digital broadcast receiving method Jul. 3, 2012
8126062 Per multi-block partition breakpoint determining for hybrid variable length coding Feb. 28, 2012
8074081 Method for replacing contents of a data storage unit Dec. 6, 2011
8046791 Signal processing apparatus and methods Oct. 25, 2011
7992169 Signal processing apparatus and methods Aug. 2, 2011
7958527 Signal processing apparatus and methods Jun. 7, 2011
7949133 Controlled cryptoperiod timing to reduce decoder processing load May. 24, 2011
7933408 Asynchronous download Apr. 26, 2011
7908478 Data processing method and data reading method Mar. 15, 2011
7865920 Signal processing apparatus and methods Jan. 4, 2011
7849479 Signal processing apparatus and methods Dec. 7, 2010
7844072 Watermark embedding and detection of a motion image signal Nov. 30, 2010
7802101 System and method of retrieving a watermark within a signal Sep. 21, 2010
7774809 Signal processing apparatus and method Aug. 10, 2010
7761890 Signal processing apparatus and methods Jul. 20, 2010
7681244 Packet transmitter apparatus Mar. 16, 2010
7634089 Cinema anti-piracy measures Dec. 15, 2009
7602940 Steganographic data hiding using a device clock Oct. 13, 2009
7555125 Systems and methods for generation of time-dependent control signals for video signals Jun. 30, 2009
7529941 System and method of retrieving a watermark within a signal May. 5, 2009
7321660 Method and apparatus for encrypting/decrypting data using timed-release keys Jan. 22, 2008
7305088 Video distribution playback method, apparatus to be disposed on video distribution end, apparatus to be disposed on video playback end, computer readable medium, and movie distribution method Dec. 4, 2007
7218738 Encryption and content control in a digital broadcast system May. 15, 2007
7212636 Encryption of a compressed video stream May. 1, 2007
7043019 Copy protection for digital motion picture image data May. 9, 2006
6882839 One-way roaming from ANS-41 to GSM systems Apr. 19, 2005
6711261 Enhancing concealment in the presence of fine mistuning for various TV scrambling techniques Mar. 23, 2004
6584310 Method and apparatus for performing authentication in communication systems Jun. 24, 2003
6243465 Method of providing video programming nearly on demand Jun. 5, 2001
6198822 Enhanced scrambling of slowly changing video signals Mar. 6, 2001
6009172 Method and apparatus for optimizing scrambling concealment of a video signal by modifying a specialized sync pulse Dec. 28, 1999
5844988 Method and apparatus for scrambling and descrambling of video signal with edge fill Dec. 1, 1998
5841863 Method and apparatus for scrambling and descrambling of video signals with edge fill Nov. 24, 1998
5671278 Video scrambling with variable function generator Sep. 23, 1997
5617475 Scrambling and descrambling of video signals using horizontal line combinations Apr. 1, 1997
5608799 Method and apparatus for scrambling and descrambling of video signal with edge fill Mar. 4, 1997
5579390 Method and apparatus for vertically scrambling and descrambling of video signals Nov. 26, 1996
5553141 Encryption and decryption (scrambling and unscrambling) of video signals Sep. 3, 1996
5504815 Method and apparatus for scrambling and descrambling Apr. 2, 1996
RE35078 Method and apparatus for encrypting and decrypting time domain signals Oct. 31, 1995
5438620 Method and apparatus for scrambling and descrambling of video signal with edge fill Aug. 1, 1995
5410601 Video scramble system and equipment Apr. 25, 1995
5212723 Burst phase correction system for video descrambling May. 18, 1993
5161188 Scrambling video by horizontal and vertical time shifting Nov. 3, 1992
5146496 Method and apparatus for enhancing the security of a scrambled television signal Sep. 8, 1992
5058157 Method and apparatus for encrypting and decrypting time domain signals Oct. 15, 1991
5003592 Scrambling video by time shifting Mar. 26, 1991
4916736 Method and apparatus for encrypting and decrypting time domain signals Apr. 10, 1990

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