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| Number | Title | Issue Date |
| 6839433 | Method and apparatus for generating a signal that defeats illegal cable decoders 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... | 01/04/2005 |
| 6836549 | Method and apparatus for synthesizing and reducing the effects of video copy protection signals A method and apparatus for defeating copy protection signals in a video signal, and also for providing copy protection signals for a video signal, is disclosed. The defeat technique generally utilizes a particular pulse position shifting, modulation, etc., of AGC, n... | 12/28/2004 |
| 6826352 | Dynamic video copy protection system Copy protection normally included in a video signal to prevent unauthorized copying is dynamically modified, by changing an attribute of the copy protection to be added to or present in the video signal. The copy protection can include any signal that affects playab... | 11/30/2004 |
| 6711261 | Enhancing concealment in the presence of fine mistuning for various TV scrambling techniques An improved method and apparatus for maintaining concealment for a scrambled signal when frequency pre-emphasis is used to defeat the scrambling. The pre-emphasis may be synthesized with high pass or peaking circuitry. More commonly however the pre-emphasis is avail... | 03/23/2004 |
| 6617910 | Low noise analog multiplier utilizing nonlinear local feedback elements A voltage controlled amplifier is improved in noise performance with nonlinear local feedback elements while maintaining low distortion for various control settings. By paralleling nonlinear elements, distortion is further improved. Preferably, these nonl... | 09/09/2003 |
| 6594441 | Method and apparatus for video tag signal recovery using various techniques to regenerate and re-record the tag signal In typical prior art generational copy protection processes, a video tag signal is added to a watermarked and/or copy protected video signal to prevent the production of unauthorized second generation copies and the playback of illicit second generation c... | 07/15/2003 |
| 6590979 | Method and apparatus for compression compatible video scrambling Scrambling and descrambling techniques are described which, unlike many typical scrambling systems, are compatible with all conceivable forms of signal compression systems. The scrambling technique is based on the principle of applying local spatial disto... | 07/08/2003 |
| 6553127 | Method and apparatus for selective block processing Methods, devices and systems for embedding and detecting a watermark in a data stream, such as a video stream. A texture criterion is evaluated for each block of the data stream. The texture criterion measures a variation of selected characteristics assoc... | 04/22/2003 |
| 6424716 | Method and apparatus for improved horizontal and vertical overlay signals for greater concealment in modern TV sets Video signals are scrambled by position modulating or switching between two types of modified horizontal sync pulses. These modified horizontal pulses are modulated or switched at a rate that causes a non-interlaced tearing pattern when viewed by an unaut... | 07/23/2002 |
| 6421497 | Method for locating copy protection pulses within selected video lines of a video signal In a known copy protection process for preventing recording of video signals, pseudo sync and AGC pulses are present on predetermined lines within the blanking intervals of the video signal so that any subsequent video tape recording of the video signal s... | 07/16/2002 |
| 6381367 | Method and apparatus for compression compatible video fingerprinting Fingerprinting and fingerprint detection, techniques are described which, unlike typical fingerprint systems used to conceal video signals, are compatible with all conceivable forms of signal compression systems while still allowing viewing of the video s... | 04/30/2002 |
| 6327422 | Method and apparatus for modifying the effects of color burst modifications to a video signal In the known color stripe process for preventing recording of video signals, the color burst present on each line of active video is modified so that any subsequent video tape recording of the video signal shows variations in the color fidelity that appea... | 12/04/2001 |
