Cryptography – Video cryptography – Video electric signal masking
Reexamination Certificate
2005-01-04
2005-01-04
Sheikh, Ayaz (Department: 2131)
Cryptography
Video cryptography
Video electric signal masking
C380S209000, C380S210000, C725S025000, C725S031000, C348S470000, C713S152000, C713S152000, C713S163000, C713S164000, C713S167000
Reexamination Certificate
active
06839433
ABSTRACT:
Illegal cable decoders, i.e., black boxes, are defeated by adding, inserting and/or superimposing an added signal onto an already scrambled video signal, which added signal is capable of disrupting the operation of the illegal cable decoder. As a result of the added signal, the illegal cable decoder outputs an unstable or unviewable picture or signal and concealment is maintained. In another embodiment of an added signal, a modulated signal with a range from about blanking level to about peak white level is added, inserted and/or superimposed on the unstable scrambled video signal in the vertical blanking interval and/or its vicinity. As a result, the illegal cable decoder is caused to generate some horizontal instabilities at its output. For those illegal cable decoders that utilize color burst as a means to decode, methods to defeat these consist of filling in color burst in the vertical blanking interval area and/or modifying the position of the correct burst while adding an incorrect frequency burst to defeat the illegal cable decoder.
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Almeida George
Macrovision Corporation
Moorthy Aravind
Sheikh Ayaz
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