GB2196167B - Apparatus for marking a recorded signal - Google Patents

Apparatus for marking a recorded signal

Info

Publication number
GB2196167B
GB2196167B GB8623533A GB8623533A GB2196167B GB 2196167 B GB2196167 B GB 2196167B GB 8623533 A GB8623533 A GB 8623533A GB 8623533 A GB8623533 A GB 8623533A GB 2196167 B GB2196167 B GB 2196167B
Authority
GB
Grant status
Grant
Patent type
Prior art keywords
apparatus
marking
recorded
signal
recorded signal
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Fee Related
Application number
GB8623533A
Other versions
GB2196167A (en )
GB8623533D0 (en )
Inventor
Lyn Holt
Barry Gordon Maufe
Anthony Wiener
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Emi PLC Thorn
EMI Group Ltd
Original Assignee
Emi PLC Thorn
EMI Group Ltd
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
Grant date

Links

Classifications

    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/00086Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • G11B20/0071Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving a purchase action
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/00086Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/00086Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • G11B20/00094Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which result in a restriction to authorised record carriers
    • G11B20/00123Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which result in a restriction to authorised record carriers the record carrier being identified by recognising some of its unique characteristics, e.g. a unique defect pattern serving as a physical signature of the record carrier
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/00086Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • G11B20/00884Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving a watermark, i.e. a barely perceptible transformation of the original data which can nevertheless be recognised by an algorithm
GB8623533A 1986-10-01 1986-10-01 Apparatus for marking a recorded signal Expired - Fee Related GB2196167B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8623533A GB2196167B (en) 1986-10-01 1986-10-01 Apparatus for marking a recorded signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8623533A GB2196167B (en) 1986-10-01 1986-10-01 Apparatus for marking a recorded signal

Publications (3)

Publication Number Publication Date
GB8623533D0 GB8623533D0 (en) 1986-11-05
GB2196167A true GB2196167A (en) 1988-04-20
GB2196167B true GB2196167B (en) 1991-01-02

Family

ID=10605059

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8623533A Expired - Fee Related GB2196167B (en) 1986-10-01 1986-10-01 Apparatus for marking a recorded signal

Country Status (1)

Country Link
GB (1) GB2196167B (en)

Cited By (48)

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Publication number Priority date Publication date Assignee Title
US5636292A (en) 1995-05-08 1997-06-03 Digimarc Corporation Steganography methods employing embedded calibration data
US5710834A (en) 1995-05-08 1998-01-20 Digimarc Corporation Method and apparatus responsive to a code signal conveyed through a graphic image
US5745604A (en) 1993-11-18 1998-04-28 Digimarc Corporation Identification/authentication system using robust, distributed coding
US5748763A (en) 1993-11-18 1998-05-05 Digimarc Corporation Image steganography system featuring perceptually adaptive and globally scalable signal embedding
US5748783A (en) 1995-05-08 1998-05-05 Digimarc Corporation Method and apparatus for robust information coding
US5809160A (en) 1992-07-31 1998-09-15 Digimarc Corporation Method for encoding auxiliary data within a source signal
US5822436A (en) 1996-04-25 1998-10-13 Digimarc Corporation Photographic products and methods employing embedded information
US5832119A (en) 1993-11-18 1998-11-03 Digimarc Corporation Methods for controlling systems using control signals embedded in empirical data
US5841886A (en) 1993-11-18 1998-11-24 Digimarc Corporation Security system for photographic identification
US5841978A (en) 1993-11-18 1998-11-24 Digimarc Corporation Network linking method using steganographically embedded data objects
US5850481A (en) 1993-11-18 1998-12-15 Digimarc Corporation Steganographic system
US5862260A (en) 1993-11-18 1999-01-19 Digimarc Corporation Methods for surveying dissemination of proprietary empirical data
US6122403A (en) 1995-07-27 2000-09-19 Digimarc Corporation Computer system linked by using information in data objects
US6408082B1 (en) 1996-04-25 2002-06-18 Digimarc Corporation Watermark detection using a fourier mellin transform
US6411725B1 (en) 1995-07-27 2002-06-25 Digimarc Corporation Watermark enabled video objects
US6424725B1 (en) 1996-05-16 2002-07-23 Digimarc Corporation Determining transformations of media signals with embedded code signals
US6567533B1 (en) 1993-11-18 2003-05-20 Digimarc Corporation Method and apparatus for discerning image distortion by reference to encoded marker signals
US6580819B1 (en) 1993-11-18 2003-06-17 Digimarc Corporation Methods of producing security documents having digitally encoded data and documents employing same
US6611607B1 (en) 1993-11-18 2003-08-26 Digimarc Corporation Integrating digital watermarks in multimedia content
US6614914B1 (en) 1995-05-08 2003-09-02 Digimarc Corporation Watermark embedder and reader
US6625297B1 (en) 2000-02-10 2003-09-23 Digimarc Corporation Self-orienting watermarks
US6694042B2 (en) 1999-06-29 2004-02-17 Digimarc Corporation Methods for determining contents of media
US6721440B2 (en) 1995-05-08 2004-04-13 Digimarc Corporation Low visibility watermarks using an out-of-phase color
US6728390B2 (en) 1995-05-08 2004-04-27 Digimarc Corporation Methods and systems using multiple watermarks
US6757406B2 (en) 1993-11-18 2004-06-29 Digimarc Corporation Steganographic image processing
US6760463B2 (en) 1995-05-08 2004-07-06 Digimarc Corporation Watermarking methods and media
US6768809B2 (en) 2000-02-14 2004-07-27 Digimarc Corporation Digital watermark screening and detection strategies
US6788800B1 (en) 2000-07-25 2004-09-07 Digimarc Corporation Authenticating objects using embedded data
US6804377B2 (en) 2000-04-19 2004-10-12 Digimarc Corporation Detecting information hidden out-of-phase in color channels
US6804376B2 (en) 1998-01-20 2004-10-12 Digimarc Corporation Equipment employing watermark-based authentication function
US6829368B2 (en) 2000-01-26 2004-12-07 Digimarc Corporation Establishing and interacting with on-line media collections using identifiers in media signals
US7694887B2 (en) 2001-12-24 2010-04-13 L-1 Secure Credentialing, Inc. Optically variable personalized indicia for identification documents
US7711144B2 (en) 2000-09-14 2010-05-04 Digimarc Corporation Watermarking employing the time-frequency domain
US7712673B2 (en) 2002-12-18 2010-05-11 L-L Secure Credentialing, Inc. Identification document with three dimensional image of bearer
US7728048B2 (en) 2002-12-20 2010-06-01 L-1 Secure Credentialing, Inc. Increasing thermal conductivity of host polymer used with laser engraving methods and compositions
US7742737B2 (en) 2002-01-08 2010-06-22 The Nielsen Company (Us), Llc. Methods and apparatus for identifying a digital audio signal
US7744002B2 (en) 2004-03-11 2010-06-29 L-1 Secure Credentialing, Inc. Tamper evident adhesive and identification document including same
US7751588B2 (en) 1996-05-07 2010-07-06 Digimarc Corporation Error processing of steganographic message signals
US7773770B2 (en) 1999-12-28 2010-08-10 Digimarc Corporation Substituting or replacing components in media objects based on steganographic encoding
US7789311B2 (en) 2003-04-16 2010-09-07 L-1 Secure Credentialing, Inc. Three dimensional data storage
US7793846B2 (en) 2001-12-24 2010-09-14 L-1 Secure Credentialing, Inc. Systems, compositions, and methods for full color laser engraving of ID documents
US7853124B2 (en) 2004-04-07 2010-12-14 The Nielsen Company (Us), Llc Data insertion apparatus and methods for use with compressed audio/video data
US7961949B2 (en) 1995-05-08 2011-06-14 Digimarc Corporation Extracting multiple identifiers from audio and video content
US8051294B2 (en) 1993-11-18 2011-11-01 Digimarc Corporation Methods for audio watermarking and decoding
US8098883B2 (en) 2001-12-13 2012-01-17 Digimarc Corporation Watermarking of data invariant to distortion
US8204222B2 (en) 1993-11-18 2012-06-19 Digimarc Corporation Steganographic encoding and decoding of auxiliary codes in media signals
US8248528B2 (en) 2001-12-24 2012-08-21 Intrasonics S.A.R.L. Captioning system
US9106347B2 (en) 2002-10-23 2015-08-11 The Nielsen Company (Us), Llc Digital data insertion apparatus and methods for use with compressed audio/video data

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DE3851724T2 (en) * 1987-07-08 1995-05-04 Matsushita Electric Ind Co Ltd Method and apparatus for the protection of copy signals.
GB8809347D0 (en) * 1988-04-20 1988-05-25 Emi Plc Thorn Apparatus for marking recorded signal
FR2658022B1 (en) * 1990-02-07 1995-09-22 Telediffusion Fse Method and system for marking and identification of digitized information.
WO1994017609A1 (en) * 1991-07-19 1994-08-04 John Barrett Kiefl Television viewer monitoring system
US5382970A (en) * 1991-07-19 1995-01-17 Kiefl; John B. Television viewer monitoring system including portable data meter for each viewer
US6301369B2 (en) 1992-07-31 2001-10-09 Digimarc Corporation Image marking to permit later identification
US5630203A (en) * 1993-01-12 1997-05-13 Weinblatt; Lee S. Technique for surveying a radio or a television audience
US7724919B2 (en) 1994-10-21 2010-05-25 Digimarc Corporation Methods and systems for steganographic processing
US7103197B2 (en) * 1993-11-18 2006-09-05 Digimarc Corporation Arrangement for embedding subliminal data in imaging
US6560349B1 (en) * 1994-10-21 2003-05-06 Digimarc Corporation Audio monitoring using steganographic information
WO1996027191A1 (en) * 1995-02-28 1996-09-06 Isis Innovation Limited Covert identification
US6229924B1 (en) * 1996-11-12 2001-05-08 Digimarc Corporation Method and apparatus for watermarking video images
CA2184949C (en) * 1995-09-28 2000-05-30 Ingemar J. Cox Secure spread spectrum watermarking for multimedia data
US6209096B1 (en) * 1996-07-02 2001-03-27 Yamaha Corporation Method and device for storing main information with associated additional information incorporated therein
US5764769A (en) * 1996-07-31 1998-06-09 International Business Machines Corporation Digital recording system with time-bracketed authentication by on-line challenges and method of authenticating recordings
US5848155A (en) * 1996-09-04 1998-12-08 Nec Research Institute, Inc. Spread spectrum watermark for embedded signalling
US6069914A (en) * 1996-09-19 2000-05-30 Nec Research Institute, Inc. Watermarking of image data using MPEG/JPEG coefficients
US5915027A (en) * 1996-11-05 1999-06-22 Nec Research Institute Digital watermarking
GB9700854D0 (en) 1997-01-16 1997-03-05 Scient Generics Ltd Sub-audible acoustic data transmission mechanism
US6108434A (en) * 1997-09-12 2000-08-22 Signafy, Inc. Counteracting geometric distortions for DCT based watermarking
DE69835133T8 (en) * 1997-12-03 2007-05-16 Kabushiki Kaisha Toshiba, Kawasaki A method of image information processing and method for preventing forgery of certificates and the like
US6154571A (en) 1998-06-24 2000-11-28 Nec Research Institute, Inc. Robust digital watermarking
US6442283B1 (en) 1999-01-11 2002-08-27 Digimarc Corporation Multimedia data embedding
GB9917985D0 (en) 1999-07-30 1999-09-29 Scient Generics Ltd Acoustic communication system
DE60136213D1 (en) 2000-11-30 2008-11-27 Intrasonics Ltd Apparatus and system for using an integrated in an acoustic signal data signal
WO2002045286A8 (en) 2000-11-30 2002-08-15 Scient Generics Ltd Acoustic communication system
US7376242B2 (en) 2001-03-22 2008-05-20 Digimarc Corporation Quantization-based data embedding in mapped data
US8050452B2 (en) 2001-03-22 2011-11-01 Digimarc Corporation Quantization-based data embedding in mapped data
US6817530B2 (en) 2001-12-18 2004-11-16 Digimarc Id Systems Multiple image security features for identification documents and methods of making same
CA2471457C (en) 2001-12-24 2011-08-02 Digimarc Id Systems, Llc Covert variable information on id documents and methods of making same
US7824029B2 (en) 2002-05-10 2010-11-02 L-1 Secure Credentialing, Inc. Identification card printer-assembler for over the counter card issuing
GB2460306B (en) 2008-05-29 2013-02-13 Intrasonics Sarl Data embedding system

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GB2164481A (en) * 1984-07-23 1986-03-19 Keen Paul David Audio and video recording technique

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GB1525292A (en) * 1976-04-30 1978-09-20 Emi Ltd Identification of records
GB2104701A (en) * 1981-08-06 1983-03-09 James Bertram King Method and apparatus for preventing unauthorised recording of source material (e.g. a gramophone recording)
GB2164481A (en) * 1984-07-23 1986-03-19 Keen Paul David Audio and video recording technique

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Cited By (78)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5809160A (en) 1992-07-31 1998-09-15 Digimarc Corporation Method for encoding auxiliary data within a source signal
US6614915B2 (en) 1992-07-31 2003-09-02 Digimarc Corporation Image capture and marking
US5930377A (en) 1992-07-31 1999-07-27 Digimarc Corporation Method for image encoding
US6590998B2 (en) 1993-11-18 2003-07-08 Digimarc Corporation Network linking method using information embedded in data objects that have inherent noise
US8204222B2 (en) 1993-11-18 2012-06-19 Digimarc Corporation Steganographic encoding and decoding of auxiliary codes in media signals
US5768426A (en) 1993-11-18 1998-06-16 Digimarc Corporation Graphics processing system employing embedded code signals
US5748763A (en) 1993-11-18 1998-05-05 Digimarc Corporation Image steganography system featuring perceptually adaptive and globally scalable signal embedding
US8184851B2 (en) 1993-11-18 2012-05-22 Digimarc Corporation Inserting watermarks into portions of digital signals
US5832119A (en) 1993-11-18 1998-11-03 Digimarc Corporation Methods for controlling systems using control signals embedded in empirical data
US5841886A (en) 1993-11-18 1998-11-24 Digimarc Corporation Security system for photographic identification
US5841978A (en) 1993-11-18 1998-11-24 Digimarc Corporation Network linking method using steganographically embedded data objects
US5850481A (en) 1993-11-18 1998-12-15 Digimarc Corporation Steganographic system
US5862260A (en) 1993-11-18 1999-01-19 Digimarc Corporation Methods for surveying dissemination of proprietary empirical data
US5745604A (en) 1993-11-18 1998-04-28 Digimarc Corporation Identification/authentication system using robust, distributed coding
US6026193A (en) 1993-11-18 2000-02-15 Digimarc Corporation Video steganography
US8051294B2 (en) 1993-11-18 2011-11-01 Digimarc Corporation Methods for audio watermarking and decoding
US6122392A (en) 1993-11-18 2000-09-19 Digimarc Corporation Signal processing to hide plural-bit information in image, video, and audio data
US7992003B2 (en) 1993-11-18 2011-08-02 Digimarc Corporation Methods and systems for inserting watermarks in digital signals
US7945781B1 (en) 1993-11-18 2011-05-17 Digimarc Corporation Method and systems for inserting watermarks in digital signals
US6343138B1 (en) 1993-11-18 2002-01-29 Digimarc Corporation Security documents with hidden digital data
US7711143B2 (en) 1993-11-18 2010-05-04 Digimarc Corporation Methods for marking images
US6757406B2 (en) 1993-11-18 2004-06-29 Digimarc Corporation Steganographic image processing
US6700990B1 (en) 1993-11-18 2004-03-02 Digimarc Corporation Digital watermark decoding method
US8355514B2 (en) 1993-11-18 2013-01-15 Digimarc Corporation Audio encoding to convey auxiliary information, and media embodying same
US6611607B1 (en) 1993-11-18 2003-08-26 Digimarc Corporation Integrating digital watermarks in multimedia content
US6567533B1 (en) 1993-11-18 2003-05-20 Digimarc Corporation Method and apparatus for discerning image distortion by reference to encoded marker signals
US6580819B1 (en) 1993-11-18 2003-06-17 Digimarc Corporation Methods of producing security documents having digitally encoded data and documents employing same
US6324573B1 (en) 1993-11-18 2001-11-27 Digimarc Corporation Linking of computers using information steganographically embedded in data objects
US6438231B1 (en) 1994-03-17 2002-08-20 Digimarc Corporation Emulsion film media employing steganography
US6111954A (en) 1994-03-17 2000-08-29 Digimarc Corporation Steganographic methods and media for photography
US5748783A (en) 1995-05-08 1998-05-05 Digimarc Corporation Method and apparatus for robust information coding
US6614914B1 (en) 1995-05-08 2003-09-02 Digimarc Corporation Watermark embedder and reader
US5710834A (en) 1995-05-08 1998-01-20 Digimarc Corporation Method and apparatus responsive to a code signal conveyed through a graphic image
US6760463B2 (en) 1995-05-08 2004-07-06 Digimarc Corporation Watermarking methods and media
US6718047B2 (en) 1995-05-08 2004-04-06 Digimarc Corporation Watermark embedder and reader
US6721440B2 (en) 1995-05-08 2004-04-13 Digimarc Corporation Low visibility watermarks using an out-of-phase color
US6728390B2 (en) 1995-05-08 2004-04-27 Digimarc Corporation Methods and systems using multiple watermarks
US6744906B2 (en) 1995-05-08 2004-06-01 Digimarc Corporation Methods and systems using multiple watermarks
US7961949B2 (en) 1995-05-08 2011-06-14 Digimarc Corporation Extracting multiple identifiers from audio and video content
US5636292A (en) 1995-05-08 1997-06-03 Digimarc Corporation Steganography methods employing embedded calibration data
US7970167B2 (en) 1995-05-08 2011-06-28 Digimarc Corporation Deriving identifying data from video and audio
US6553129B1 (en) 1995-07-27 2003-04-22 Digimarc Corporation Computer system linked by using information in data objects
US6775392B1 (en) 1995-07-27 2004-08-10 Digimarc Corporation Computer system linked by using information in data objects
US6411725B1 (en) 1995-07-27 2002-06-25 Digimarc Corporation Watermark enabled video objects
US6122403A (en) 1995-07-27 2000-09-19 Digimarc Corporation Computer system linked by using information in data objects
US5822436A (en) 1996-04-25 1998-10-13 Digimarc Corporation Photographic products and methods employing embedded information
US6408082B1 (en) 1996-04-25 2002-06-18 Digimarc Corporation Watermark detection using a fourier mellin transform
US6751320B2 (en) 1996-04-25 2004-06-15 Digimarc Corporation Method and system for preventing reproduction of professional photographs
US8184849B2 (en) 1996-05-07 2012-05-22 Digimarc Corporation Error processing of steganographic message signals
US7751588B2 (en) 1996-05-07 2010-07-06 Digimarc Corporation Error processing of steganographic message signals
US6424725B1 (en) 1996-05-16 2002-07-23 Digimarc Corporation Determining transformations of media signals with embedded code signals
US6804376B2 (en) 1998-01-20 2004-10-12 Digimarc Corporation Equipment employing watermark-based authentication function
US6694042B2 (en) 1999-06-29 2004-02-17 Digimarc Corporation Methods for determining contents of media
US7773770B2 (en) 1999-12-28 2010-08-10 Digimarc Corporation Substituting or replacing components in media objects based on steganographic encoding
US7756290B2 (en) 2000-01-13 2010-07-13 Digimarc Corporation Detecting embedded signals in media content using coincidence metrics
US8027510B2 (en) 2000-01-13 2011-09-27 Digimarc Corporation Encoding and decoding media signals
US6829368B2 (en) 2000-01-26 2004-12-07 Digimarc Corporation Establishing and interacting with on-line media collections using identifiers in media signals
US6625297B1 (en) 2000-02-10 2003-09-23 Digimarc Corporation Self-orienting watermarks
US6768809B2 (en) 2000-02-14 2004-07-27 Digimarc Corporation Digital watermark screening and detection strategies
US6804377B2 (en) 2000-04-19 2004-10-12 Digimarc Corporation Detecting information hidden out-of-phase in color channels
US6823075B2 (en) 2000-07-25 2004-11-23 Digimarc Corporation Authentication watermarks for printed objects and related applications
US6788800B1 (en) 2000-07-25 2004-09-07 Digimarc Corporation Authenticating objects using embedded data
US8077912B2 (en) 2000-09-14 2011-12-13 Digimarc Corporation Signal hiding employing feature modification
US7711144B2 (en) 2000-09-14 2010-05-04 Digimarc Corporation Watermarking employing the time-frequency domain
US8098883B2 (en) 2001-12-13 2012-01-17 Digimarc Corporation Watermarking of data invariant to distortion
US7694887B2 (en) 2001-12-24 2010-04-13 L-1 Secure Credentialing, Inc. Optically variable personalized indicia for identification documents
US7793846B2 (en) 2001-12-24 2010-09-14 L-1 Secure Credentialing, Inc. Systems, compositions, and methods for full color laser engraving of ID documents
US8248528B2 (en) 2001-12-24 2012-08-21 Intrasonics S.A.R.L. Captioning system
US8548373B2 (en) 2002-01-08 2013-10-01 The Nielsen Company (Us), Llc Methods and apparatus for identifying a digital audio signal
US7742737B2 (en) 2002-01-08 2010-06-22 The Nielsen Company (Us), Llc. Methods and apparatus for identifying a digital audio signal
US9106347B2 (en) 2002-10-23 2015-08-11 The Nielsen Company (Us), Llc Digital data insertion apparatus and methods for use with compressed audio/video data
US7712673B2 (en) 2002-12-18 2010-05-11 L-L Secure Credentialing, Inc. Identification document with three dimensional image of bearer
US7728048B2 (en) 2002-12-20 2010-06-01 L-1 Secure Credentialing, Inc. Increasing thermal conductivity of host polymer used with laser engraving methods and compositions
US7789311B2 (en) 2003-04-16 2010-09-07 L-1 Secure Credentialing, Inc. Three dimensional data storage
US7744002B2 (en) 2004-03-11 2010-06-29 L-1 Secure Credentialing, Inc. Tamper evident adhesive and identification document including same
US9332307B2 (en) 2004-04-07 2016-05-03 The Nielsen Company (Us), Llc Data insertion apparatus and methods for use with compressed audio/video data
US8600216B2 (en) 2004-04-07 2013-12-03 The Nielsen Company (Us), Llc Data insertion apparatus and methods for use with compressed audio/video data
US7853124B2 (en) 2004-04-07 2010-12-14 The Nielsen Company (Us), Llc Data insertion apparatus and methods for use with compressed audio/video data

Also Published As

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GB8623533D0 (en) 1986-11-05 grant

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19941001