Bilateral anti-copying device for video systems
July 28, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesAnti-piracy method and system Method and apparatus for preparing recorded program material to render detectable unauthorized magnetic tape duplications, and method and apparatus for detecting such duplications Method of and apparatus for modifying a video signal to prevent unauthorized recording and reproduction thereof Method of and apparatus for modifying a video signal to prevent unauthorized recording and reproduction thereof Video information recording and reproducing methods and apparatus Electronic apparatus Apparatus for preventing video tape duplication Two dimensional interpolation circuit for spatial and shading error corrector systems Voltage controlled subcarrier phase shifter Circuit for minimizing edge hooking in television camera pickup tubes InventorsAssigneeApplicationNo. 358576 filed on 05/26/1989US Classes:386/94, Record protection (e.g., anti-copying)360/60, Recording-or erasing-prevention380/203Having copy protect signalExaminersPrimary: Richardson, Robert L.Assistant: Tran, Thai Attorney, Agent or FirmForeign Patent References
International ClassH04N 005/76AbstractA video system anti-copying device in which leading and trailing code sequences are inserted into the luminance portion of a video signal. These code sequences are visually manifested as dropouts on a video monitor. When the sequences match, operation of record circuitry in a video recorder is inhibited.Other References
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