WO2005098831A2 - Procede d'apport d'une protection de copie pour des supports a memoire optique - Google Patents

Procede d'apport d'une protection de copie pour des supports a memoire optique Download PDF

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Publication number
WO2005098831A2
WO2005098831A2 PCT/US2005/009893 US2005009893W WO2005098831A2 WO 2005098831 A2 WO2005098831 A2 WO 2005098831A2 US 2005009893 W US2005009893 W US 2005009893W WO 2005098831 A2 WO2005098831 A2 WO 2005098831A2
Authority
WO
WIPO (PCT)
Prior art keywords
disc
copy
generation
dvd
copy protection
Prior art date
Application number
PCT/US2005/009893
Other languages
English (en)
Other versions
WO2005098831A3 (fr
Inventor
Bradley Thomas Collar
Original Assignee
Warner Bros. Entertainment 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 Warner Bros. Entertainment Inc. filed Critical Warner Bros. Entertainment Inc.
Publication of WO2005098831A2 publication Critical patent/WO2005098831A2/fr
Publication of WO2005098831A3 publication Critical patent/WO2005098831A3/fr

Links

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
    • G11B20/00731—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving a digital rights management system for enforcing a usage restriction
    • G11B20/00746—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving a digital rights management system for enforcing a usage restriction wherein the usage restriction can be expressed as a specific number
    • G11B20/00753—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving a digital rights management system for enforcing a usage restriction wherein the usage restriction can be expressed as a specific number wherein the usage restriction limits the number of copies that can be made, e.g. CGMS, SCMS, or CCI flags
    • 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
    • G11B20/00731—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving a digital rights management system for enforcing a usage restriction
    • G11B20/00746—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving a digital rights management system for enforcing a usage restriction wherein the usage restriction can be expressed as a specific number
    • G11B20/00753—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving a digital rights management system for enforcing a usage restriction wherein the usage restriction can be expressed as a specific number wherein the usage restriction limits the number of copies that can be made, e.g. CGMS, SCMS, or CCI flags
    • G11B20/00768—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving a digital rights management system for enforcing a usage restriction wherein the usage restriction can be expressed as a specific number wherein the usage restriction limits the number of copies that can be made, e.g. CGMS, SCMS, or CCI flags wherein copy control information is used, e.g. for indicating whether a content may be copied freely, no more, once, or never, by setting CGMS, SCMS, or CCI flags

Definitions

  • This invention pertains to a method of preventing the copying of an optical storage medium on a copying device such as a CD, DVD or other optical disc burner.
  • a copying device such as a CD, DVD or other optical disc burner.
  • An optical disc such as a CD, DVD, HD-DVD or Blu-ray Disc (collectively "DVD")
  • DVD has a very large digital data storage capacity.
  • the making of DVDs was a complicated process and DVDs could be made only in special pressing plants.
  • devices known as DVD burners have become available that can write data on blank (recordable) DVD discs.
  • Some DVD burner software allows a user to make an unauthorized copy on a recordable DVD of the programming content of an original or prerecorded DVD.
  • the present invention involves modifying or formatting an original or first generation disc such that the DVD copying software perceives the DVD to be a second generation disc that was made by copying an original DVD.
  • the software therefore will not copy even an original first generation disc.
  • the original DVD adheres to all of the relevant DVD specifications and, accordingly, its contents can be reproduced by any standard player.
  • any attempt by a user to copy this original or prerecorded DVD on a DVD burner using software such as DVD X-COPY will not be successful.
  • Fig. 1 shows how data is organized on a prior art first generation DVD
  • Fig. 2 shows how a first generation DVD is burned using existing software
  • Fig. 3 shows how data is organized on a prior art first generation DVD
  • Fig. 4 shows how data is organized on a first generation DVD in accordance with this invention.
  • a prerecorded or pressed DVD like most other types of data storage media, has data files organized in a hierarchical directory system. More specifically, an original DVD has a ROOT directory with a VIDEO _TS subdirectory.
  • the VIDEO_TS subdirectory includes the normal components of a multimedia presentation, such as video object files identified as * .vob, navigational information files identified as * .ifo, and backup files, identified as *.bup.
  • this type of disc is referred to as an original or first generation disc.
  • the DVD X-COPY software can be used to make second generation DVDs, but not third generation DVDs (where the second generation DVD is made by DVD X-Copy).
  • step 100 the original DVD is loaded into the DVD burner.
  • step 102 the program looks for a copy protection file.
  • the copy protection file is one that the software itself writes to a recordable disc when making a second generation copy of an original disc (see step 106 below). Therefore, the copy protection file is not found on a standard original disc. If no file is found in step 104, then the making of a disc copy is permitted. In step 106 a copy protection indication file is generated.
  • the file may include some standard text and information indicating what software was used, the software version, the date on which the file was generated, flags indicating rules governing whether the file can be copied (e.g., "copy never,” “copy once,” “unrestricted copying") etc.
  • the copy protection file can even contain no information in the case where (as in the case of DVD X-COPY) the software merely looks for the file's presence (in step 104), but not any specific content of the file.
  • the software calls this file "archive.txt”.
  • step 1 08 the contents of the original DVD are copied on a recordable DVD to make the second generation copy.
  • the copy protection file archive.txt is created and recorded on the second generation copy.
  • Fig. 3 shows the data on the second generation DVD.
  • the copy protection file (archive.txt) is shown in the ROOT directory.
  • this or similar files can be placed anywhere else on the DVD as well so long as the playback of the DVD on a standard player device will not be impaired.
  • step 104 when a second generation DVD is inserted into the DVD burner, in step 104 the copy protection file is found.
  • the software generates a fault message indicating that copying of this DVD is not permitted, and the software will not copy the DVD.
  • the overall sequencing does not prevent a user from making multiple second generation DVDs from an original DVD.
  • an original DVD is made in a way that it is mistakenly recognized by copying software, such as DVD X-COPY, as being a second generation DVD (even though it is really a first generation) and will not make a copy of it. More particularly, as shown in Fig. 4, an original DVD is produced that includes in its ROOT directory (but may also be located in some other location so long as playback is not affected) a copy protection file, such as archive.txt, as well as the other standard files in the VIDEO_TS directory.
  • the software finds the copy protection file in step 104 and therefore handles it as a second generation recordable DVD and will not copy it.
  • the copy protection file (or files if multiple copying programs are to be foiled) is inserted during the disc authoring process and is thereafter incorporated on each original disc through replication.
  • the contents of the file archive.txt do not matter. If in future versions, or in different disc copying products, the contents of the file do become material, the copy protection file impressed on the first generation DVD should satisfy whatever the software's requirement is for indicating that the DVD is a copy.
  • the copy protection file could have other formats as well.
  • the file could be a binary file.
  • this binary file contains only binary zeros.
  • the program DVD X-COPY looks for the copy protection file archive.txt in the root directory.
  • Other software programs may be provided that may look for a different copy protection file, such as CPF2.xxx in the ROOT directory, or CPF3.yyy in the VIDEO_TS directory. Therefore an original DVD can include these files as well, as shown in Fig. 4.
  • As new software is written to copy DVDs if it writes on a copy some indication that the disc is a copy of an original and should not be copied, then that software can be foiled from making even a second generation copy simply by including that indication on an original disc.
  • discs can contain multiple copy protection files on a single disc to foil a wide variety of disc copying software programs which, individually, rely on the presence or absence of different copy protection files in determining whether an archive copy is permitted. Numerous modifications may be made to the invention without departing from its scope as defined in the appended claims.

Abstract

Un logiciel permettant de graver des disques générant uniquement un second disque de génération à partir d'un original ou un premier disque de génération par ajout à la seconde génération d'une indication de protection de copie. Selon l'invention, un disque original comprend des fichiers de programme normaux et comprend également une indication de protection de copie. Lorsqu'une tentative est faite de copier un tel disque au moyen d'un logiciel permettant de graver des disques, le logiciel ne va pas effectuer une seconde copie de génération parcequ'il va identifier par erreur le disque original comme étant une copie.
PCT/US2005/009893 2004-03-26 2005-03-24 Procede d'apport d'une protection de copie pour des supports a memoire optique WO2005098831A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US55691404P 2004-03-26 2004-03-26
US60/556,914 2004-03-26

Publications (2)

Publication Number Publication Date
WO2005098831A2 true WO2005098831A2 (fr) 2005-10-20
WO2005098831A3 WO2005098831A3 (fr) 2007-01-11

Family

ID=35125764

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2005/009893 WO2005098831A2 (fr) 2004-03-26 2005-03-24 Procede d'apport d'une protection de copie pour des supports a memoire optique

Country Status (1)

Country Link
WO (1) WO2005098831A2 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6389220B2 (en) * 1997-01-13 2002-05-14 Sony Corporation Information signal duplication control system
US7023993B1 (en) * 1995-07-21 2006-04-04 Sony Corporation Signal reproducing/recording/transmitting method and apparatus and signal record medium for use with signals featuring a multiple-phase color burst

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7023993B1 (en) * 1995-07-21 2006-04-04 Sony Corporation Signal reproducing/recording/transmitting method and apparatus and signal record medium for use with signals featuring a multiple-phase color burst
US6389220B2 (en) * 1997-01-13 2002-05-14 Sony Corporation Information signal duplication control system

Also Published As

Publication number Publication date
WO2005098831A3 (fr) 2007-01-11

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