AU764069B2 - Copy method avoiding bit-to-bit duplication of digital data and reading device for implementing same - Google Patents

Copy method avoiding bit-to-bit duplication of digital data and reading device for implementing same Download PDF

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Publication number
AU764069B2
AU764069B2 AU60936/99A AU6093699A AU764069B2 AU 764069 B2 AU764069 B2 AU 764069B2 AU 60936/99 A AU60936/99 A AU 60936/99A AU 6093699 A AU6093699 A AU 6093699A AU 764069 B2 AU764069 B2 AU 764069B2
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AU
Australia
Prior art keywords
digital data
medium
serial number
reading device
bit
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Expired
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AU60936/99A
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AU6093699A (en
Inventor
Sylvain Chevreau
Eric Diehl
Teddy Furon
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Vantiva SA
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Thomson Multimedia SA
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Application filed by Thomson Multimedia SA filed Critical Thomson Multimedia SA
Publication of AU6093699A publication Critical patent/AU6093699A/en
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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • G11B20/00188—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which result in a restriction to authorised devices recording or reproducing contents to/from a record carrier
    • G11B20/00195—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which result in a restriction to authorised devices recording or reproducing contents to/from a record carrier using a device identifier associated with the player or recorder, e.g. serial numbers of playback apparatuses or MAC addresses
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
    • G11B23/28—Indicating or preventing prior or unauthorised use, e.g. cassettes with sealing or locking means, write-protect devices for discs
    • G11B23/283—Security features, e.g. digital codes
    • G11B23/284—Security features, e.g. digital codes on the record carrier
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • G11B20/00094—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which result in a restriction to authorised record carriers
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • G11B20/00094—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which result in a restriction to authorised record carriers
    • G11B20/00115—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which result in a restriction to authorised record carriers wherein the record carrier stores a unique medium identifier
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • G11B20/00094—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which result in a restriction to authorised record carriers
    • G11B20/00123—Circuits 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
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • G11B20/0021—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • G11B20/0021—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier
    • G11B20/00217—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier the cryptographic key used for encryption and/or decryption of contents recorded on or reproduced from the record carrier being read from a specific source
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • G11B20/0021—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier
    • G11B20/00217—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier the cryptographic key used for encryption and/or decryption of contents recorded on or reproduced from the record carrier being read from a specific source
    • G11B20/00253—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier the cryptographic key used for encryption and/or decryption of contents recorded on or reproduced from the record carrier being read from a specific source wherein the key is stored on the record carrier
    • G11B20/00347—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier the cryptographic key used for encryption and/or decryption of contents recorded on or reproduced from the record carrier being read from a specific source wherein the key is stored on the record carrier wherein the medium identifier is used as a key
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00—Record carriers by type
    • G11B2220/20—Disc-shaped record carriers
    • G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
    • G11B2220/2537—Optical discs
    • G11B2220/2545—CDs
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00—Record carriers by type
    • G11B2220/20—Disc-shaped record carriers
    • G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
    • G11B2220/2537—Optical discs
    • G11B2220/2562—DVDs [digital versatile discs]; Digital video discs; MMCDs; HDCDs
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00—Record carriers by type
    • G11B2220/90—Tape-like record carriers

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  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)
  • Storage Device Security (AREA)
  • Developing Agents For Electrophotography (AREA)
  • Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)

Abstract

The invention concerns a copy method avoiding bit-to-bit duplication of digital data and a reading device for implementing said method. The method is characterised in that the medium whereon the digital data are to be duplicated comprises a serial number used for formatting the read digital data before writing them on said medium. The invention is useful in particular for duplicating DVD's, CD's, magnetic tapes or the like.

Description

METHOD OF COPYING WHICH AVOIDS THE BIT-BY-BIT DUPLICATION OF DIGITAL DATA AND) READING DEVICE FOR IMPLEMENTING THE METHOD Technical Field The present invention relates to a method of copying which avoids the bit-by-bit duplication of digital data arising from a first source on a medium. It also relates to a device used to implement this method.
Background Art Digital data exhibit the property of being able to be copied without appreciable loss of quality. Indeed, copying consists in transmitting a series of binary information, namely "l"s and "0"s from the source to the recorder device. The errors which customarily occur during copying are easily corrected by using well known error correction methods. Thus, when an information medium or a data source contains digital data, it is relatively simple to record them identically on a recordable medium.
To protect digital data against illicit copying, various methods are used.
Usually, the supplier furnishes the digital data medium such as the diskette in the case of software, with a mark preventing any copying.
In the document EP-A-O 773 490, there is proposed a system for protecting the 20 information stored in recording media, in which system each medium comprises an identifier.
Another way of protecting digital data against copying consists in endowing them with a watermark or "tattoo", that is to say with auxiliary data tied to the digital data. The watermark must be non-modifiable and non-erasable. In this case, the reading of the data is done with the aid of a private key which identifies the watermark. Should there be any copying of the watermarked digital data, a private key is required to put the watermark back in place on the copy, without which the copy becomes illegal, being as it is devoid of watermark. The digital data copied without watermark are no longer read by the reader since the latter does not identify the watermark where it ought 30 to find one. Thus, the watermark precludes any copying without the private key.
These known methods of protecting copies are in general effective when the medium is processed by compliant reading or recording apparatuses. However, these methods do not avoid duplication by a pirate who creates a double or clone which is as similar as possible to the original by carrying out what is termed bit-by-bit copying.
Disclosure of Invention The aim of the present invention is to propose a method of copying which avoids the unauthorized duplication of digital data arising from a first source on a medium, this method precluding bit-by-bit copying of the digital information.
The aim of the present invention is also to provide a reading device comprising circuits allowing the implementation of said method.
Accordingly, one aspect of the present invention is a method of copying which avoids the bit-by-bit duplication of digital data arising from a source of digital data on a medium characterized in that said medium comprises: a step of formatting the digital data arising from said source of digital data as a function of a serial number contained in said medium, said serial number being unique for each medium or having a low probability of being common with that of another medium, and a step of writing said formatted data onto said medium.
According to a preferred embodiment, the serial number is recorded in an unfalsifiable manner on the medium during its manufacture. For maximum avoidance of any pirating, the serial number may be a unique number for each medium or may exhibit a low probability of being common to two media.
Furthermore, the formatting of the digital data to be duplicated is carried out 20 using a secret-key encryption algorithm such as DES or a public-key algorithm such as S RSA, the encryption key being dependent on the serial number.
Preferably, the encryption key is moreover dependent upon a secret parameter which is contained in any reading device adapted for reading the digital data arising from said data source.
The present invention also relates to a method of copying which avoids the bitby-bit duplication of digital data read by a reading device and copied onto a medium, characterized in that the medium comprises a serial number and in that the method of copying comprises the following steps: sending of the serial number recorded on the medium to the reading device, 30 formatting of the digital data read with the aid of the serial number, and *...-recording on said medium of the formatted digital data.
According to a preferred embodiment, the formatting step is carried out in the reading device. Said reading device furthermore may comprise means making it possible to read the medium containing the formatted digital data.
According to a further characteristic of the method in accordance with the present invention, before performing the duplication of the digital data, the method may comprise a step of checking authorization to copy.
The present invention also relates to a reading device allowing the implementation of the said methods of copying described hereinabove. According to this aspect of the invention, the device comprises a formatting circuit adapted for receiving the serial number of the medium onto which the digital data are to be copied and providing, as output, formatted data which are dependent on said serial number and are intended to be copied onto said medium.
The present invention also relates to a recording medium for digital data comprising a serial number which is unique or exhibits a low probability of being common with that of another medium, characterized in that it furthermore comprises recorded digital data, said digital data being formatted as a function of said serial number and of a secret parameter.
Other characteristics and advantages of the present invention will become apparent on reading the description of a preferred embodiment given with reference to the herein-appended drawing in which: Brief Description of the Drawings 20 Figure 1 is a diagrammatic view in block form of a reading device and of a recorder device allowing the copying ofa first medium onto a second medium.
S. Best Modes for Carrying Out the Invention The present invention will be described whilst referring to the reading of digital data recorded on a digital medium such as a DVD standing for Digital Versatile Disc and copied onto a second virgin medium likewise consisting of a DVD which in this case must be recordable, namely a DVD-R. However, it is obvious to the person skilled in the art that other sources of digital information may be used, in particular digital information arising from a decoder and sent by a "broadcaster" or digital information 30 stored on media such as a magnetic tape, a recordable or non-recordable optical disc, namely a CD, a CD-R, CD-RW, DVD, DVD-R, a magneto-optical disc or the like. The recording medium consists of a recordable magnetic tape, a CD-R, a CD-RW, a DVD- R or a magneto-optical disc allowing storage of the audio and/or video information in digital form.
As represented in figure 1, the method of copying in accordance with the present invention makes it possible to copy the digital information D recorded on a DVD 1 by using a reading device 2 furnished with a formatting circuit 3 and the data FD which may be duplicated are recorded on a DVD-R 4 inserted into a recorder device In accordance with the present invention, the DVD-R 4 consisting of a virgin DVD-R comprises a serial number which is recorded in an unfalsifiable manner during the manufacture of the DVD-R. This serial number which is chosen in such a way as to be unique or to exhibit a very low probability of being present on two different media, is stored in a concealed area of the disc, such as the area entitled the "lead-in area", namely the track lead-in. As explained in greater detail hereinbelow, this serial number is used to format the digital data read from the original DVD 1.
In accordance with the method claimed in the present invention, the data read on the DVD 1 by the reading device 2 are sent to a formatting circuit 3 which carries out a formatting of the data by using the serial number read on the virgin DVD-R. Data FD formatted in a specific manner are thus obtained at the output of the reading device and are sent to the recorder device 5 where they are recorded on the DVD-R 4.
To carry out a formatting of the data such that the data recorded on the DVD-R cannot be copied bit-by-bit but can however be read back subsequently by the reading device, namely to make a so-called licit copy, various formatting processes may be used. One of the conventional formatting processes is a secret-key encryption algorithm such as DES standing for "Data Encryption Standard" which is well known to 20 specialists. To avoid any copying by a pirate, the key used in this case will be a key constructed with the aid of a secret key and of the serial number read on the virgin To carry out the formatting using this algorithm, the data recorded on the original DVD are chopped up into blocks of 64 bits then formatted by the DES using a 56-bit key obtained from the serial numbers. 64-bit formatted or enciphered data packets are obtained at the output and are recorded by way of the recorder apparatus on the DVD-R 4. If the key consists of the serial number itself, the serial number will comprise 56 bits. However, the number of bits of the serial number is given by way of example. Indeed, it is possible to apply the invention to media whose serial numbers S have lengths of greater than or less than 56 bits. In this case, a truncation or a channel 30 coding can be applied so as to bring these serial numbers to the correct length. If the key is, for security reasons, a function of the serial number, it can be obtained as follows: Given that NS is the serial number of the recording medium, and PS is the parameter stored in a secure manner in the compliant reading devices: NS and PS are concatenated so as to have a word (NS/PS), a hash function is applied such as the function SHA-1 (standard of the National Institute of Standards and Technologies) and this results in the word SHA (NS/PS) which has a length of 64 bits, and this word is truncated so as to have a 56-bit word which will serve as key for the
DES.
The length of the binary words NS and PS is not fixed, since SHA-1 does not necessitate a precise length for the input word. The function faccommodates any length of serial number.
The DVD-R 4 thus copied licitly can be read by the reading device 2 and the original digital data are recovered using the corresponding decryption algorithm.
It is also possible to carry out the formatting of the digital data to be duplicated by using a public-key algorithm such as the RSA algorithm. This public-key algorithm is an asymmetric algorithm which, when the public key is known, precludes easy copying of the formatted data during their reading by the reading device 2.
Since the data located on the copy DVD-R do not have the same structure as the data of the original DVD, it is therefore not possible to recover them with a reading device other than a compliant reading device. Moreover, if a bit-by-bit copy of the original DVD has been made, the reading device of the present invention does not retrieve the original digital information and will not read the copy.
20 According to a further characteristic of the present invention, the method of copying can be preceded by a step of checking authorization to copy such as that described in French patent application No. 98 11860 filed on 23 September 1998 in the name of THOMSON multimedia and entitled "Protection contre la copie de donn~es num6riques stock6es sur un support d'information" [Protection against the copying of digital data stored on an information medium]. This checking of authorization to copy is applied to an information medium comprising a first identification of a cipher of the digital data, a second identification of a watermark of digital data, a first determination of a first mark if it has been possible to identify the cipher and the watermark, a third identification of a type of the information medium, a second determination of a second 30 mark if it has been possible to determine the first mark and if it has been possible to .9o.
identify a determined type of information medium, a fourth identification of cryptographic signature data accompanying the digital data, a third determination of a third mark if it has been possible to determine the second mark and if it has been possible to identify a cryptographic signature datum and a first delivery of permission for digital copying of the digital data if it has been possible to determine the third mark.
All of the characteristics described in this French patent application are incorporated into the present patent application for carrying out the checking of authorization to copy.
In accordance with the present invention, the device 2 for reading the digital data which may be a DVD reader, a decoder, a CD reader or the like, comprises a formatting circuit 3 consisting essentially of an integrated circuit including all the means required for carrying out the algorithm chosen for the formatting and making it possible to store in an unfalsifiable manner certain data such as a secret key or means for authorizing copying.
The embodiment described hereinabove is given by way of example and can be modified without departing from the framework of the claims herein-enclosed.
S

Claims (14)

1. A method of copying which avoids the bit-by-bit duplication of digital data arising from a source of digital data on a medium, characterized in that said method comprises: a step of formatting the digital data arising from said source of digital data as a function of a serial number contained in said medium, said serial number being unique for each medium or having a low probability of being common with that of another medium, and a step of writing said formatted data onto said medium.
2. The method as claimed in claim 1, characterized in that the serial number is recorded in an unfalsifiable manner on the medium during its manufacture.
3. The method as claimed in any one of claims 1 or 2, characterized in that the step of formatting of the digital data to be duplicated is carried out using a secret-key encryption algorithm such as DES or a public-key algorithm such as RSA.
4. The method as claimed in claim 3, characterized in that the encryption key is 20 dependent on the serial number.
5. The method as claimed in claim 4, characterized in that the encryption key is furthermore dependent on a secret parameter contained in any reading device adapted for reading the digital data arising from said source.
6. A method of copying which avoids the bit-by-bit duplication of digital data read by a reading device and copied onto a medium, characterized in that the medium .comprises a serial number and in that the method of copying comprises the following steps: 30 sending of the serial number recorded on the medium to the reading device, formatting of the digital data read with the aid of the serial number, and recording on said medium of the formatted digital data.
7. The method as claimed in claim 6, characterized in that the formatting step is carried out in the reading device.
8. The method as claimed in any one of claims 6 or 7, characterized in that the reading device comprises means making it possible to read the medium containing the formatted digital data.
9. The method as claimed in any one of claims 6 to 8, characterized in that before performing the duplication of the digital data, it comprises a step of checking authorization to copy.
A reading device allowing the implementation of a method of copying according to any one of claims 1 to 9, characterized in that it comprises a formatting circuit adapted for receiving the serial number of the medium onto which the digital data are to be copied and providing as output, formatted data which are dependent on said serial number and are intended to be copied onto said medium.
11. A recording medium for digital data comprising a serial number which is unique or exhibits a low probability of being common with that of another medium, characterized in that it furthermore comprises recorded digital data, said digital data being formatted as a function of said serial number and of a secret parameter. oooe o *20
12. A method of copying, substantially as herein described with reference to the accompanying figure.
13. A reading device, substantially as herein described with reference to the accompanying figure.
14. A recording medium for digital data, substantially as herein described with reference to the accompanying figure. •.DATED this tenth day of June 2003 THOMSON multimedia Patent Attorneys for the Applicant: F.B. RICE CO.
AU60936/99A 1998-10-19 1999-10-11 Copy method avoiding bit-to-bit duplication of digital data and reading device for implementing same Expired AU764069B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR98/13074 1998-10-19
FR9813074A FR2784830A1 (en) 1998-10-19 1998-10-19 Copying method for CDRoms and DVD discs uses unique serial number permanently recorded on every disc to prevent un-authorised copying
PCT/FR1999/002425 WO2000023993A1 (en) 1998-10-19 1999-10-11 Copy method avoiding bit-to-bit duplication of digital data and reading device for implementing same

Publications (2)

Publication Number Publication Date
AU6093699A AU6093699A (en) 2000-05-08
AU764069B2 true AU764069B2 (en) 2003-08-07

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AU60936/99A Expired AU764069B2 (en) 1998-10-19 1999-10-11 Copy method avoiding bit-to-bit duplication of digital data and reading device for implementing same

Country Status (14)

Country Link
EP (1) EP1123545B1 (en)
JP (1) JP4812939B2 (en)
KR (1) KR100756351B1 (en)
CN (1) CN1324599C (en)
AT (1) ATE503249T1 (en)
AU (1) AU764069B2 (en)
BR (1) BR9914622A (en)
DE (1) DE69943300D1 (en)
ES (1) ES2362169T3 (en)
FR (1) FR2784830A1 (en)
HU (1) HU229542B1 (en)
PL (1) PL347328A1 (en)
RU (1) RU2292092C2 (en)
WO (1) WO2000023993A1 (en)

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EP1164588A3 (en) * 2000-06-12 2006-09-13 Pioneer Corporation Information outputting apparatus and method, information recording apparatus and method, information outputting recording system and information recording medium
WO2007128418A1 (en) * 2006-05-10 2007-11-15 Nero Ag Apparatus for writing data to a medium
EP1944766A1 (en) * 2007-01-15 2008-07-16 Hitachi-LG Data Storage Korea Inc. Method of recording and reproducing data on and from optical disc
EP1855281A3 (en) * 2006-05-10 2012-08-15 Nero Ag Apparatus for writing data to a medium

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US7236322B2 (en) 2003-08-20 2007-06-26 International Business Machines Corporation Method, system, and program for storing data in a storage medium
KR100994772B1 (en) 2004-01-10 2010-11-16 삼성전자주식회사 Method for copying and reproducing the data of storage medium
JP4198628B2 (en) 2004-04-08 2008-12-17 株式会社リコー Information recording apparatus, recording operation control method thereof, and recording operation control program
US7808867B2 (en) * 2006-02-01 2010-10-05 Wellen Sham System with read protecting function
US8301906B2 (en) 2006-05-10 2012-10-30 Nero Ag Apparatus for writing information on a data content on a storage medium
CN101197987B (en) * 2006-12-08 2010-09-29 上海全景数字技术有限公司 Digital television program recording and playback method and system

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HUP0104066A3 (en) 2002-11-28
CN1324599C (en) 2007-07-04
KR100756351B1 (en) 2007-09-10
CN1323438A (en) 2001-11-21
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AU6093699A (en) 2000-05-08
KR20010080117A (en) 2001-08-22

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