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WO2000074366A2 - Systemes et procedes utilises dans la prevention du piratage d'images cinematographiques par un camescope - Google Patents

Systemes et procedes utilises dans la prevention du piratage d'images cinematographiques par un camescope Download PDF

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Publication number
WO2000074366A2
WO2000074366A2 PCT/US2000/014777 US0014777W WO0074366A2 WO 2000074366 A2 WO2000074366 A2 WO 2000074366A2 US 0014777 W US0014777 W US 0014777W WO 0074366 A2 WO0074366 A2 WO 0074366A2
Authority
WO
WIPO (PCT)
Prior art keywords
motion picture
subsystem
frame rate
random
data
Prior art date
Application number
PCT/US2000/014777
Other languages
English (en)
Other versions
WO2000074366A3 (fr
Inventor
Donald C. Mead
Original Assignee
Digital Electronic Cinema, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Digital Electronic Cinema, Inc. filed Critical Digital Electronic Cinema, Inc.
Priority to AU54481/00A priority Critical patent/AU5448100A/en
Publication of WO2000074366A2 publication Critical patent/WO2000074366A2/fr
Publication of WO2000074366A3 publication Critical patent/WO2000074366A3/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/91—Television signal processing therefor
    • H04N5/913—Television signal processing therefor for scrambling ; for copy protection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/91—Television signal processing therefor
    • H04N5/913—Television signal processing therefor for scrambling ; for copy protection
    • H04N2005/91357—Television signal processing therefor for scrambling ; for copy protection by modifying the video signal
    • H04N2005/91385—Television signal processing therefor for scrambling ; for copy protection by modifying the video signal the video frame number being modulated
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/91—Television signal processing therefor
    • H04N5/913—Television signal processing therefor for scrambling ; for copy protection
    • H04N2005/91392—Television signal processing therefor for scrambling ; for copy protection using means for preventing making copies of projected video images

Definitions

  • This invention is directed to methods and systems for preventing the piracy of motion picture images from motion picture theaters. More particularly, this invention is directed to the prevention of unauthorized duplication of motion pictures by use of a recording device to record the motion picture images while being displayed on a motion picture screen.
  • the motion picture industry is routinely victimized by the presence of unauthorized duplicates of a motion picture.
  • the unauthorized duplications detract from the revenues that would be otherwise generated by a lawful sale of viewing time, such as the tickets sold at for viewing the motion picture at a theater.
  • the end result of these acts of piracy is to deny the motion picture industry the full enjoyment of the ownership benefits afforded to their work under Copyright laws and in realizing the full profit potential of their work.
  • unauthorized duplicate are generated involve the use of portable recording devices, such as handheld camcorders.
  • a handheld camcorder is usually carried into the movie theater and positioned in such way as to provide the input lens with a substantially unobstructed view of the display screen.
  • the camcorder's input circuitry then captures the projected motion picture images from the display screen and records them onto a recording medium, such as a video tape.
  • a recording medium such as a video tape.
  • the recording medium on which the illegally recorded motion picture has been stored can itself be subsequently duplicated further by conventional means and outside of the movie theater, into several copies. These subsequent reproductions are often done in large numbers, and then illegally sold. The sale of these duplicates in turn further contribute to diminish the motion picture industry's rights to earn from their protected intellectual property.
  • the prior art suffers from several shortcomings, one of which is the inability to provide a method to achieve the desired lack of synchronization (by preventing the camcorder to re-synchronize with the electronic projector) has taken place
  • the U.S Patent 5,680,454 proposes a pseudo random generator to vary the frame rate of a video electronic projector
  • the system disclosed in the prior art does not necessarily generate the same number of frames below the reference frame rate, thus synchronization of audio and video is not ensured
  • the present invention is a system and method for preventing the piracy of motion picture images
  • the system includes a randomizer subsystem to randomly vary the display rate of one or more frames of an electronically projected displayed motion picture image
  • a random process generator subsystem and a frame rate timing subsystem are used to vary the frame selection and display rate of a motion picture bit stream in order to hamper the ability of an unauthorized recording device to synchronize its recording rate with that of display rate, thus substantially degrading the quality of the recorded motion picture
  • the present invention is another system and method for preventing piracy of motion picture images
  • the system includes a transmitter subsystem to transmit adverse energy to a recording device to degrade the images recorded by the recording device from a display screen
  • a set of energy sources directed to the recording devices transmit energy waves with sufficient intensity to degrade the images recorded by the recording devices
  • the energy sources are optimally positioned and/or sufficient in number to substantially cover the motion picture display area
  • FIG 1 is a block diagram of the first embodiment the present invention for preventing piracy of motion picture images
  • FIG 2 is a diagram of the noise generator circuit
  • FIG 3 is diagram illustrating the workings of the various components of the first embodiment of the present inv ention as illustrated in FIG 1
  • FIG 4 is a block diagram of the second preferred embodiment of the present invention for preventing piracy of motion picture images
  • the systems and methods of present invention disclosed herein are directed to the prevention of unauthorized duplication of motion pictures by use of a recording device to record the motion picture images while being displayed on a motion picture screen
  • FIG 1 illustrates the overall system architecture of the first embodiment of the present invention
  • the system includes a randomizer subsystem 1 to randomly varv the display rate of the projected motion picture images
  • the randomizer subsystem 1 further includes three main subsystems of 1) a Frame rate pattern function subsystem 10, 2) a Random Process Generator Subsystem 30, 3) and a Frame rate timing subsystem 20 The working of each of these main subsystems will now be disclosed in greater detail
  • the random process generator subsystem 30 utilizes a random function for generating the sector select signal 3 1 used to select a frame rate pattern function stored in the memory module of the frame rate pattern function subsystem 10
  • the random function is based on the electrical noise derived from at least one physical process that generate an electrical noise
  • the electrical noise is the result of the naturally occurring physical process of thermal agitation of electrons in an object, generally an electrically conductive object
  • Conductive objects have in general an inherent abundance of free floating electrons, which when exposed to external physical stimuli such as heat or radiation would become thermally agitated and move about in a completely random fashion. The moving electrons would then randomly collide with one another, producing heat which can be subsequently registered as electrical noise. The sheer number of electrons would render each collision configuration a unique set and hence the resulting electrical noise would be unique as well.
  • even the most minute changes in the intensity and/or duration of the external physical stimuli such as heat would produce a different level of thermal agitation which would further augment the uniqueness of each collision configuration.
  • FIG 2 illustrates an exemplary embodiment of this aspect of the present invention in form of the noise generator 2.
  • the analog noise generator unit 20 contains a resistor unit 21 and an amplifier unit 22.
  • the resistor unit 21 is used as the resistive object that naturally generates electrical noise although other resistive objects such as other electrical resistors or diodes such as a zener diode can also used and are anticipated to be within the scope of the present invention.
  • the resistor unit 21 generates the electrical noise which is outputted in form of an electrical signal that is inputted into the amplifier unit 22 for signal amplification.
  • the amplifier output is then sent to a sample and hold unit 23 which would select a snap-shot sample of the amplifier's generally continuous output and forward it to the Analog to Digital (A/D) convertor unit 24 for a digital version of the resistor ' s analog output.
  • the A/D 24 would then also reconfigure the digital output into a bit sequence which constitutes the sector select signal 31.
  • a 10 bit sequence is used for the sector select signal 31 although a bit sequence of any length can also be used and are anticipated to be within the scope of the present invention.
  • the present invention does not rely on a pseudo-random generator which utilize mathematical algorithms for generation of random numbers, the use of which is prone to predictability upon careful study of the algorithmic process.
  • the random function is the result of a naturally occurring physical process that is unique in each occurrence and hence truly random and unpredictable in output generation from one function to the next.
  • the random process generator subsystem 30 is used at regular occurring time periods, for example at one second intervals. The timing of such interval are provided by the frame clock 15 received from the frame rate pattern function subsystem 10, described below. 2 Frame Rate Pattern Function Subsystem
  • the frame rate pattern function subsystem 10 includes a parser unit 11, a memory address unit 12 a read only memorv unit 13 and a numerically controlled oscillator (NCO) 14
  • the motion picture images in form of image bit-streams are received by the parser unit
  • the image bitstream is generally in form of packets which contain an information portion along with a header portion which generally instructs the recipient system on how to process the information portion of the packet
  • the information portion of each packet contains the motion picture image data 18 while the header portion contains information on the frame clock 15
  • the parser unit 1 1 separates the incoming motion picture images bitstream packets into its constituent motion picture image data 18 and the frame clock 15
  • the frame clock 15 is then forward to the memory address unit 12 and also to the random process generator subsystem 30
  • the motion picture image data 1 8 is forwarded to the frame rate timing subsystem 20
  • the frame clock 15 is forwarded to the memory address unit 12 which utilizes the timing information contained in the frame clock 15 along with the sector select 3 1 to select the proper operating information from RAM 13
  • the NCO 14 then receives the output of RAM 13 based on which it generates a pixel clock 16 forwarded to the frame rate timing subsystem 20
  • FIG 3 discloses in greater detail the workings of the memory unit 12, RAM 13 and
  • NCO 14 which interact to vary the frame rate of a projected motion picture so that a recording device attempting to record the screen display will be unable to maintain svnchronization
  • the memory address unit 12 stores in a memory module a number of pattern function sets, with each pattern function set being in odd function symmetry about the motion picture image frame rate, such as symmetric about 24 frames per second Each pattern function set must be symmetric about the motion picture frame rate to ensure that the images remain in synchronization with the audio portion of the motion picture
  • pattern function generators are stored on a programmable medium such as an Electncally- Erasable Programmable Read Only Memory (EEPROM) ty pically during the projector manufacturing process The EEPROMs can generate sets of pattern functions to be used in the memory address 12
  • a different set of pattern functions is loaded in form of a set of N-bits sequences 34 into each word sectors 35 stored in the RAM 13
  • the N-bits sequences 34 are 14 bits in length althougn anv length can be used
  • a different N-bits component 34 is loaded into each word within a sector 35
  • the overall flow of the process is regulated by the frame clock 15 inputted into the state counter 32
  • the state counter 32 further subdivides the each time interval of frame clock 15 into a number of subintervals that correspond to the number of words in a sector
  • each sector would correspond to one second of motion picture time and with each second of the frame clock 15 subdivided into 24 segments of equal time lengths of 1/24 seconds
  • bit sequence in the sector select signal 31 determines an individual sector 35 to be used .s described above the bit sequence in the sector select signal 3 1 is generated by the true random generation process of random process generator subsystem 30 and thus results in the selection of each sector in a completely random fashion
  • the first sector "0" is shown to be have been chosen by the sector select signal 31 as an example, although any sector 35 can be selected with equal effectiveness
  • each sector 35 is further subdivided into a number of words which typically correspond to the motion picture image frame rate, for example, 24
  • each sector 35 is made up of 24 words marked 0-23
  • each word in the sector is then further selected, typically in a sequential fashion starting with word 0 and ending in word 23 Since the set of frame rates must average the motion picture image frame rate to 24 frames per second dunng the time interval, the 24 words per sector are used once during each sector usage
  • the N- bit pattern 34 associated with each selected word within a sector is forwarded to the numerically controlled oscillator (NCO) 14 and loaded into the NCO counter 31
  • the NCO counter 31 is typically a holding register which also receives as input a frequency from the frequency generator 30
  • the NCO counter 31 then divides the received frequency by the N-bit pattern to calculate the pixel clock 16
  • the state counter 32 sequentially advances time to the next subdivision of the frame clock 15, for example the 2nd subdivision out of 24 and the next word in the sector is selected sequentially, for example word 1
  • the N-bits of that word is then sent to the NCO 14, resulting in another calculation of pixel clock 16 Since each N-bit sequence is different, a different pixel clock 16 is generated each time
  • the process continues until the ⁇ -bits in all words are sent to the NCO at which point a new sector select signal 3 1 is generated, selecting another sector 35 Since the frame clock 15 also controls the generation of the sector select signal 3 1 , each time interval of frame clock
  • the motion picture image data 18 and pixel clock 16 output signals generated by the frame rate pattern function subsystem 10 are received by the frame rate timing subsystem 20 which utilizes the received signals to time the projection of the motion picture images by the electronic projector display system 50 onto a display screen
  • the pixel clock 16 determines the frequency rate by which each frame of the motion picture image data 18 is to be displayed, thus by randomly varying the pixel clock 16 as described above the frequency rate by which each frame of the motion picture image data 18 is displayed is also randomlv changed The result is that a recording dev ice attempting to record the screen display will be unable to maintain synchron
  • a communications interface 40 is optionally provided so that the operations of the randomizer subsystem 1 can be monitored and/or modified from remote sites.
  • One or more remote sites can transmit the motion picture image bitstream used by the frame pattern function subsystem 30, and receive various operational and status feedback from the various subsystems of randomizer subsystem 1.
  • the optional communications interface 40 may also be used to provide the randomizer subsystem 1 with the capability of downloading pattern functions for the memory address unit 12 via a communications interface from a remote site.
  • the new pattern functions can be included in the motion picture image bitstream, for example in the header portion and forward to the memory address unit 12.
  • the communications interface 40 can also be used to remotely replace stored pattern functions, or to change the periodicity of the selection of the pattern functions, such as, for example, changing selection periodicity from selecting a function once a second to twice a second
  • the communications interface 40 can be further used to remotely modify parameters of the pattern functions, such as the excursion from the nominal motion picture image frame rate.
  • the function generators in the memory address unit 12 are stored on programmable mediums such as an Electrically-Erasable Programmable Read
  • the communications interface 40 can be further used to remotely re-program the EEPROMS with modified information such as changed parameters for the pattern functions.
  • FIG. 4 illustrates the overall system architecture of the second embodiment of the present invention for preventing piracy of motion picture images, using a transmitter subsystem
  • the subsystems of the transmitter subsystem 5 are:
  • the energy sources 50 generate and transmit energy beams 55 toward the recording devices in the movie theater to degrade the quality of the motion picture recorded.
  • Recording devices such as camcorders generally include an input circuitry which captures incoming light such as those of a projected motion picture image, and converts them into elect ⁇ cal signals for later image processing
  • the input circuitrv is generally an array of photo-detectors such as light sensitive charged coupled devices (CCD) typicallv made of MOS capacitors When exposed to the photons of incoming light, electron-hole pairs are induced in the MOS capacitors The MOS capacitor collects these electrons at its many sensors, forming electron packets that are subsequently converted into useful electrical signals
  • this blooming effect is induced by the energy beams 55 that are transmitted at a color frequency range that lies within the frequencv range of light visible to the human ev e but transmitted in pulses of such duration and periodicity as to remain undetectable bv the viewer Any color frequency can be used for transmission
  • One advantage of the foregoing method is that because the frequency range is within that of visible light, an optical filter may not be effectively used to block the signal without itself causing substantial detrimental impact on the motion picture image signal being received bv the recording device from the display screen
  • the energv sources 50 generate and transmit frequencies in the frequencv rate of red light, utilizing a red laser for example, with the energv beams having a duration of approximately 20 microseconds and occurring with the periodicity of less than every one-half seconds
  • the energy sources 50 are also pulsed on and off using a pseudo-random generator or a true-random generator, in the fashion disclosed above tor the first embodiment of the present invention, to provide a signal of variable pulse width and pe ⁇ odicitv These pulses are of sufficient transmitted intensity to cause a blooming effect on the input circuitry of the recording device while regulated based on a timing cycle set to effectuate a resulting low average energy, so as to not cause the presence of red light to become detectable by the viewer Thus bv providing sufficient transmitted power to cause a blooming effect on the input circuitry of the recording device, the energy sources 50 cause substantial degradation in the quality of the recordings of the camcorder
  • one or more of energy sources 50 are mounted on the display screen, and oriented so that the transmitted energy beams radiate towards the viewers in a motion picture theatre, preferably at the level of camcorder lens, and with sufficient transmitted power to substantially degrade the quality of the recorded images by recording devices even if the recording devices are positioned at points in the theater
  • one or more electronic driver modules 51 provide operational data via electronic instruction signals to control the energy sources 50
  • These instructions include, though not limited to, instructions to set and adjust the power intensity of the transmitted energy beam, instructions to set and adjust the transmitted frequency or frequencies of the energy beams, instructions to set and adjust pulse width and periodicity of the energy, and to control switching functions to switch between alternate output frequencies of the energy sources 50.
  • the electronic driver modules 51 varies the frequency of the energy source 50 utilizing a random function generator to determine the periodicity of the switching function.
  • a communications interface 54 is optionally provided so that the operations of the transmitter subsystem 3 can be monitored and performed from remote sites.
  • One or more remote sites can transmit the operational data used by the electronic driver modules 3 1 to signal the energy sources 30, and receive various operational and status feedback from the various subsystems of transmitter subsystem 3.
  • the foregoing second embodiment feature of the present invention may also be used in combination with the foregoing first embodiment of the present invention.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)
  • Television Signal Processing For Recording (AREA)

Abstract

L'invention porte sur de nouveaux systèmes et procédés utilisés dans la prévention du piratage d'images cinématographiques par enregistrement d'images, au moment où celles-ci passent sur un écran de cinéma, à l'aide d'un caméscope utilisé comme magnétoscope. L'invention porte sur deux systèmes et procédés alternatifs d'antipiratage. Le premier procédé consiste à faire varier la fréquence des images cinématographiques affichées de manière aléatoire, ce qui empêche le caméscope de synchroniser sa vitesse de trames interne sur celle de l'image cinématographique affichée. Le second procédé consiste à transmettre une énergie pulsée par fréquences à des fréquences de lumière visible telle que la lumière infrarouge de sorte que la puissance ou la fréquence transmise soit suffisante pour dégrader la qualité de l'image enregistrée par le magnétoscope. La qualité des images enregistrées est ainsi considérablement dégradée. Ces deux réalisations peuvent être utilisées seules ou en combinaison.
PCT/US2000/014777 1999-05-27 2000-05-26 Systemes et procedes utilises dans la prevention du piratage d'images cinematographiques par un camescope WO2000074366A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU54481/00A AU5448100A (en) 1999-05-27 2000-05-26 Systems and methods for preventing camcorder piracy of motion picture images

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US13662599P 1999-05-27 1999-05-27
US60/136,625 1999-05-27

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WO2000074366A2 true WO2000074366A2 (fr) 2000-12-07
WO2000074366A3 WO2000074366A3 (fr) 2001-05-03

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Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001033846A3 (fr) * 1999-10-29 2001-12-13 Sarnoff Corp Procede et dispositif de brouillage de film
WO2001056279A3 (fr) * 2000-01-28 2001-12-13 Sarnoff Corp Mesures de lutte contre la piraterie audiovisuelle
EP1261201A2 (fr) 2001-05-16 2002-11-27 Sony Corporation Imagerie
EP1301034A2 (fr) * 2001-10-02 2003-04-09 Sony Corporation Modulation de l'état optique
EP1381234A1 (fr) * 2002-05-21 2004-01-14 Eastman Kodak Company Méthode et système pour la prévention de la piraterie de copyright
EP1237369A3 (fr) * 2001-02-28 2004-08-25 Eastman Kodak Company Protection contre la copie pour données d'image animée numériques
EP1463310A1 (fr) * 2003-03-27 2004-09-29 Eastman Kodak Company Projecteur avec une sécurité augmentée contre la saisie non authorisée d'images par un camescope
US6861640B2 (en) 2002-11-14 2005-03-01 Elliott D. Light Detecting and thwarting imaging systems at theatrical performances
WO2005106918A1 (fr) * 2004-04-02 2005-11-10 Roberts Jon L Detection et empechement de l'utilisation de systemes de prise de vue lors de representations theatrales
DE102004023800A1 (de) * 2004-05-05 2005-12-01 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Verfahren und Markierungsvorrichtung zum Versehen von optischen Informationen mit einer Marke
US7020383B2 (en) 2002-11-14 2006-03-28 Light Elliott D Detecting and thwarting imaging systems at theatrical performances
EP1416318A4 (fr) * 2001-08-10 2007-12-05 Sony Corp Procede et systeme de perturbation d'image
US7326911B2 (en) 2002-11-14 2008-02-05 Auctnyc 19 Llc Detecting and thwarting content signals originating from theatrical performances
US7332706B2 (en) 2002-11-14 2008-02-19 Auctnyc 19 Llc Detecting and thwarting imaging systems at theatrical performances
US7634089B1 (en) 1999-10-29 2009-12-15 Sarnoff Corporation Cinema anti-piracy measures
US7728950B2 (en) 2004-11-01 2010-06-01 Thomson Licensing Anticamcorder media projection using enhanced frame rate
EP2270591A1 (fr) 2005-08-22 2011-01-05 Nds Limited Protection contre la copie de film
WO2011021111A1 (fr) * 2009-08-20 2011-02-24 Nds Limited Procédé et système empêchant la reconnaissance optique de caractères d'un texte affiché
US20150049487A1 (en) * 2013-08-15 2015-02-19 Robert A. Connor Privawear(TM): Wearable Technology for Disrupting Unwelcome Photography
US9641725B2 (en) 2012-11-27 2017-05-02 Philips Lighting Holding B.V. Use of ambience light for copy protection of video content displayed on a screen
GB2512239B (en) * 2011-12-29 2018-12-12 Intel Corp Display backlight modulation
US11533450B2 (en) 2017-09-25 2022-12-20 Comcast Cable Communications, Llc Anti-piracy video transmission and display
CN115668907A (zh) * 2020-04-09 2023-01-31 高盛公司有限责任公司 振荡视频刷新

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US5680454A (en) * 1995-08-04 1997-10-21 Hughes Electronics Method and system for anti-piracy using frame rate dithering

Cited By (37)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001033846A3 (fr) * 1999-10-29 2001-12-13 Sarnoff Corp Procede et dispositif de brouillage de film
US7634089B1 (en) 1999-10-29 2009-12-15 Sarnoff Corporation Cinema anti-piracy measures
US7324646B1 (en) 1999-10-29 2008-01-29 Sarnoff Corporation Method and apparatus for film anti-piracy
WO2001056279A3 (fr) * 2000-01-28 2001-12-13 Sarnoff Corp Mesures de lutte contre la piraterie audiovisuelle
US7043019B2 (en) 2001-02-28 2006-05-09 Eastman Kodak Company Copy protection for digital motion picture image data
EP1237369A3 (fr) * 2001-02-28 2004-08-25 Eastman Kodak Company Protection contre la copie pour données d'image animée numériques
EP1261201A2 (fr) 2001-05-16 2002-11-27 Sony Corporation Imagerie
EP1261201A3 (fr) * 2001-05-16 2008-01-16 Sony Corporation Imagerie
US7393108B2 (en) 2001-08-10 2008-07-01 Sony Corporation Imaging disturbing method and system
EP1416318A4 (fr) * 2001-08-10 2007-12-05 Sony Corp Procede et systeme de perturbation d'image
EP1301034A2 (fr) * 2001-10-02 2003-04-09 Sony Corporation Modulation de l'état optique
EP1381234A1 (fr) * 2002-05-21 2004-01-14 Eastman Kodak Company Méthode et système pour la prévention de la piraterie de copyright
US8148673B2 (en) 2002-11-14 2012-04-03 Auctnyc 19 Llc Detecting and thwarting content signals originating from theatrical performances
US7755025B2 (en) 2002-11-14 2010-07-13 Light Elliott D Detecting and thwarting content signals originating from theatrical performances
US7020383B2 (en) 2002-11-14 2006-03-28 Light Elliott D Detecting and thwarting imaging systems at theatrical performances
US6977366B2 (en) 2002-11-14 2005-12-20 Light Elliott D Detecting and thwarting imaging systems at theatrical performances
US7326911B2 (en) 2002-11-14 2008-02-05 Auctnyc 19 Llc Detecting and thwarting content signals originating from theatrical performances
US7332706B2 (en) 2002-11-14 2008-02-19 Auctnyc 19 Llc Detecting and thwarting imaging systems at theatrical performances
US6861640B2 (en) 2002-11-14 2005-03-01 Elliott D. Light Detecting and thwarting imaging systems at theatrical performances
EP1463310A1 (fr) * 2003-03-27 2004-09-29 Eastman Kodak Company Projecteur avec une sécurité augmentée contre la saisie non authorisée d'images par un camescope
CN100426128C (zh) * 2003-03-27 2008-10-15 伊斯曼柯达公司 增强可靠使便携式摄像机失效的放映机
US7221759B2 (en) 2003-03-27 2007-05-22 Eastman Kodak Company Projector with enhanced security camcorder defeat
WO2005106918A1 (fr) * 2004-04-02 2005-11-10 Roberts Jon L Detection et empechement de l'utilisation de systemes de prise de vue lors de representations theatrales
DE102004023800A1 (de) * 2004-05-05 2005-12-01 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Verfahren und Markierungsvorrichtung zum Versehen von optischen Informationen mit einer Marke
US7728950B2 (en) 2004-11-01 2010-06-01 Thomson Licensing Anticamcorder media projection using enhanced frame rate
EP2270591A1 (fr) 2005-08-22 2011-01-05 Nds Limited Protection contre la copie de film
US7907248B2 (en) 2005-08-22 2011-03-15 Nds Limited Movie copy protection
US8243252B2 (en) 2005-08-22 2012-08-14 Nds Limited Movie copy protection
WO2011021111A1 (fr) * 2009-08-20 2011-02-24 Nds Limited Procédé et système empêchant la reconnaissance optique de caractères d'un texte affiché
GB2512239B (en) * 2011-12-29 2018-12-12 Intel Corp Display backlight modulation
US9641725B2 (en) 2012-11-27 2017-05-02 Philips Lighting Holding B.V. Use of ambience light for copy protection of video content displayed on a screen
US20150049487A1 (en) * 2013-08-15 2015-02-19 Robert A. Connor Privawear(TM): Wearable Technology for Disrupting Unwelcome Photography
US9140444B2 (en) * 2013-08-15 2015-09-22 Medibotics, LLC Wearable device for disrupting unwelcome photography
US11533450B2 (en) 2017-09-25 2022-12-20 Comcast Cable Communications, Llc Anti-piracy video transmission and display
US11930294B2 (en) 2017-09-25 2024-03-12 Comcast Cable Communications, Llc Anti-piracy video transmission and display
CN115668907A (zh) * 2020-04-09 2023-01-31 高盛公司有限责任公司 振荡视频刷新
EP4133716A4 (fr) * 2020-04-09 2024-04-24 Goldman, Sachs & Co. LLC Rafraîchissement vidéo oscillant

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