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7620178 |
Copy protection for video signal added pulses
Enhancements to a video anticopying process that causes an abnormally low amplitude video signal to be recorded on an illegal copy. In one version, positive going pulses are added to the video...
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7492896 |
Copy protection for video signal using added negative amplitude pulse
Enhancements to a video anticopying process that causes an abnormally low amplitude video signal to be recorded on an illegal copy. The enhancements in one version introduce into the overscan...
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7471795 |
Information transmission system
A sending apparatus generates a first initial vector, a second initial vector, and an encryption key in response to a pseudo random number. Original information is encrypted into cipher information...
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7352863 |
Copy protection for video signal using narrowed horizontal synchronization signals and amplitude modulation
Enhancements to a video anticopying process that causes an abnormally low amplitude video signal to be recorded on a illegal copy. The enhancement in one version include a negative going waveform...
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7113597 |
System and method for protection of video signals
A method and system are provided for protecting an analog video signal sent from a video signal source to a video display enabled to receive a protected video signal. The method includes sending a...
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7050698 |
Method and apparatus for synthesizing or modifying a copy protection signal using a lowered signal level portion
A modified Colorstripe™ copy protection process utilizes a basic anti-copy protection (ACP) signal that causes attenuation of a video signal, wherein, in one embodiment, the process modifies...
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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...
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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...
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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...
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6285765 |
Method and apparatus for reducing effects of copy protection of composite video signal
Copy protection for composite video signals is well known. Copy protection, while it does not prohibit making a copy per se, does render any copy (recording) of the video signal relatively...
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6173109 |
Method and apparatus for removing or defeating effects of copy protection signals from 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...
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6028941 |
Method for the defeat of illegal descramblers sensitive to the edges of sync in scrambled video
A method for defeating illegal receivers sensitive to the edges of synchronization signals in a scrambled video signal is provided. The scrambled video signal includes synchronization signals...
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6005839 |
Data transmitting method, data recording apparatus, data record medium and data reproducing apparatus
A data transmitting method for preventing direct copying of digital bi-level signals. When processing input digital data from an input terminal 11 by circuits 13 to 16, modulating the data by a...
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5978480 |
System for scrambling and descrambling video signals by altering synchronization patterns
A system for scrambling and descrambling a composite video signal having content and an associated composite synchronization signal. The system comprises an apparatus for scrambling the composite...
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5912970 |
Television scrambling system
A sync suppression, phase inversion scrambling system for a television signal is modified to improve its anti-piracy attributes SAW filters are switched during horizontal intervals to introduce...
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5768376 |
Video signal scrambling apparatus
A video signal scrambling apparatus which scrambles a video signal in a cable or commercial broadcasting system to prevent nonsubscribers from viewing the signal and the unwarranted descrambling of...
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5768377 |
Video signal descrambling apparatus
A video signal descrambling apparatus capable of restoring a scrambled video signal transmitted from a cable television or commercial broadcasting system to the original standard video signal to...
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5748733 |
Method and apparatus to reduce effects of certain copy protection purses within a video signal
Enhancements to a video anticopying process that causes an abnormally low amplitude video signal to be recorded on an illegal copy. The enhancements in one version introduce into the overscan...
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5737417 |
Videotape anti-copying encryption scheme
Anti-copying protection for video material is provided wherein at least one high-amplitude pulse is inserted into various lines of the video signal, in and immediately preceding the vertical...
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5661801 |
Method and apparatus for stabilizing and brightening prerecorded TV signals encoded with copy protection
A method and apparatus are provided for preventing the existence of pseudo-sync pulses and added AGC pulses in an original video tape with copy protection from producing a poor t.v. picture when...
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5651065 |
Insertion of supplemental burst into video signals to thwart piracy and/or carry data
A video signal is modified to include a supplemental burst signal on at least some of the scan lines for each frame. The supplemental burst signals are used to prevent a pirate decoder from...
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5583936 |
Video copy protection process enhancement to introduce horizontal and vertical picture distortions
Enhancements to a video anticopying process that causes an abnormally low amplitude video signal to be recorded on an illegal copy. The enhancements in one version introduce into the overscan...
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5301033 |
Circuit for preventing false detection of video sync pulses in a video signal which also contains copy guard signals
A circuit for preventing the false detection of vertical sync pulses included in a video signal which also includes copy guard signals inserted in predetermined intervals thereof, including signal...
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5287409 |
Method and apparatus for frustrating vertical interval detection in scrambled television signals
In order to defeat pirate descramblers that detect the occurrence of a vertical blanking interval from a gap in timing data provided on the sound carrier of a scrambled television signal,...
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5166976 |
System and method for detection of a pulse within a video signal
An audiovisual subscription system includes means for aperiodically inverting the lines of a transmitted video signal of a frame-by-frame basis and for decrypting encrypted PCM audio information...
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5142575 |
Method and apparatus for improving video scrambling and employing split sync pulses
This invention discloses a new and improved method of scrambling video signals by inversion of the video information by splitting the sync pulse into plural portions and transmitting each portion...
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5125028 |
Television signal scrambling method and apparatus
A television scrambling system of the GSS type includes a false key signal to defeat pirate decoders. The false key is placed approximately one half a horizontal line period following the last...
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4951315 |
Video signal noise evaluation and removal circuit
By extracting a high frequency A.C. signal from the tips of the horizontal sync pulses, and sensing for the presence of pulses occurring at abnormal times, an extremely simple method of both...
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4716588 |
Addressable subscription television system having multiple scrambling modes
A multimode scrambling system for video signal transmission systems is described. The system provides for baseband video scrambling controlled by a central originating computer facility. The...
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4521809 |
Method and apparatus for controlling access to selected television programs
In order to control subscriber access to selected television programs in a CATV system, nonstandard horizontal synchronizing pulses, having a greater amplitude and either a higher or lower pulse...
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3958077 |
Picture transmission systems
In a television or other picture transmission the picture is scanned in a random or pseudo-random manner enabling picture analysis and transmission within band widths considerably smaller than with...
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3485941 |
TELEVISION SYSTEM WITH MODIFIED SYNC SIGNALS AND AUXILIARY TIMING INFORMATION
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3478166 |
CRYPTOGRAPHIC SUBSCRIPTION TELEVISION SYSTEM WITH GREY SYNC AND DUAL MODE AUGMENTING SIGNALS
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3460161 |
SECRECY TELEVISION APPARATUS WITH SCRAMBLED SYNCHRONIZING SIGNALS
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3313880 |
Secrecy television system with false synchronizing signals
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2913518 |
Subscription television
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