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"The Americans have need of the telephone, but we do not. We have plenty of messenger boys."
Sir William Preece, chief engineer, British Post Office ; 1878
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| Number | Title | Issue Date |
| 6381747 | Method for controlling copy protection in digital video networks A method and system of providing copy protection of video analog and digital signals and the like, wherein the signals are transmitted via a digital delivery network, and may comprise, for example, pay per view (PPV) program materials protected by copyrig... | 04/30/2002 |
| 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 |
| 6058191 | Method and apparatus for modifying the envelope of a RF carrier signal to remove copy protection signals therefrom A method and apparatus is disclosed for disabling the effect of copy protection signals embedded in video signals, wherein the detection and modification of the copy protection signals is accomplished in the RF domain rather than in the baseband video dom... | 05/02/2000 |
| 5953417 | Method and apparatus for digitally removing or defeating effects of copy protection signals from a video signal Video signals in today's environment exist in both the analog domain and the digital domain. In many instances it may be desirable to delete or reduce the effectiveness of a video signal containing analog copy protection signals while the signals are in t... | 09/14/1999 |
| 5754649 | Video media security and tracking system A video disc designed for providing security and tracking data in the rental video media market. Those new formats for video players and media allow for inclusion of security features which both allow tracking of rental of such media and prevent unauthori... | 05/19/1998 |
