KR20080012724A - Recording medium, method and apparatus for reproducing data, and method and apparatus for recording data - Google Patents

Abstract

A recording medium, a method and an apparatus for reproducing data, and a method and an apparatus for recording data are provided to trace an optical recording/reproducing apparatus damaging the contents and thus to protect the contents from illegal copy and distribution. A recording medium includes a stream area and a security area. The stream area stores stream. The security area stores overwrite information appointing the values to be overwritten and the overwrite areas in the stream. The overwrite information is defined to prevent the overwrite areas from being overlapped. The recording medium includes a content code used for the overwrite process for the stream.

Description

Recording medium, data recording method and recording apparatus and data reproducing method and recording apparatus {Recording Medium, method and apparatus for reproducing data, and method and apparatus for recording data}

Figure 1 is shown to aid the conceptual understanding of the present invention, it is shown to show an example of the integrated use between the optical recording and playback device and peripherals.

2 shows a data file structure of the present invention.

3 is shown to help conceptually understand the media transform.

4 shows a data recording structure recorded on an optical disc according to the present invention.

5 shows an example of the overall configuration of the optical recording and reproducing apparatus of the present invention.

6 shows an example of a recording medium reproducing apparatus utilizing the reproducing system of the present invention.

The system model of FIG. 7 is shown based on a security tool of a secure virtual machine.

8A through 8B illustrate a schematic diagram of a media transform using a multiplexing fixup table and a data structure of a fixup table.

9A-9B show a schematic diagram of a media transform using a fixup table stored as a file and the data structure of the fixup table.

10 shows an example of the structure of the fix-up entry of the present invention.

11 illustrates an example in which a media transform is applied according to the present invention.

12A-12C illustrate embodiments of a media transform according to the first method of the present invention.

13A-13B illustrate an embodiment of applying a media transform in the order of the reference source packet number, according to the second method of the present invention.

14A-14B illustrate an embodiment of applying a media transform in the reverse order of a reference source packet number, in accordance with a second method of the present invention.

 * Explanation of symbols for main parts of the drawings

11 pickup 12 control unit

13: signal processor 15: storage

17: playback system

171: User Event Manager

171a: UO Controller

172: Module Manager

173: Metadata Manager

174: HDMV module (Movie Module)

175: BD-J Module

175a: Java Virtual Machine

175b: Application Manager

176: Playback Control Engine

176a: Playback control function

176b: Player registers

177: Presentation Engine

178: Security Virtual Machine

179: transform function

40: Virtual File System

The present invention relates to the reproduction of data provided by a content provider, and more particularly to a data reproducing method and reproducing apparatus capable of protecting the data, and a recording medium and a data recording method and a recording apparatus.

As a recording medium, an optical disk capable of recording a large amount of data is widely used. Most recently, new high-density recording media, such as Blu-ray Discs (BDs) and high-density digital video discs (HD-DVDs), can record and store high-quality video data and high-quality audio data for a long time. High Definition Digital Versatile Disc) and the like are being developed.

High-density recording media, the next-generation recording media technology, are next-generation optical recording solutions that can contain data that significantly surpasses existing DVDs.

In relation to this, development of the optical recording and reproducing apparatus applying the high density recording medium standard has also begun, but it is true that the development of the optical recording and reproducing device is difficult due to the fact that the high density recording medium standard is not completely completed yet.

However, in reproducing an external input signal and a high-density recording medium as described above, a preferred method for protecting the content provided by the content provider and a preferred method for reproducing the content to which the content protection method is applied are not known. There are many limitations in developing the optical recording and reproducing apparatus based on the present invention.

The present invention was created in view of the above circumstances, and an object thereof is to protect content provided by a true content provider from illegal copying, distribution, and the like.

Accordingly, the present invention is to provide a preferred content protection method and a method of playing the content to which the method is applied.

In order to achieve the above object, the present invention provides a stream region for storing a stream; And a security area for storing overwrite information for specifying values and overwrite areas to be overwritten in the stream, wherein the overwrite information is defined such that the overwrite areas do not overlap. to provide.

The present invention also includes an embodiment in which the recording medium includes a content code used in an overwrite process for the stream.

The present invention also includes an embodiment in which the overwrite information is stored in the recording medium in a masked form.

The present invention also includes an embodiment in which the overwrite information is multiplexed into the stream and stored in the recording medium.

In addition, the present invention includes an embodiment in which the overwrite information is configured in a separate file and stored in the security area.

In addition, the present invention includes an embodiment in which the overwrite information includes packet location information specifying a packet to be overwritten, and the packet location information is defined to designate different packets of the stream.

The present invention may also include overwrite start position information for designating a position at which an overwrite is started in a packet to be overwritten, and when the overwrite information designates at least one packet with the same, The location information includes an embodiment in which overwrite areas are not overlapped in the designated same packet.

The present invention also includes an embodiment in which the overwrite information is defined such that it does not include another reference packet between the reference packet used for designating the packet to be overwritten and the packet to be overwritten.

The present invention also records a stream on a recording medium, generates overwrite information specifying values and overwrite areas to be overwritten on the stream, and writes the overwrite information to the recording medium. Provided is a data recording method which is generated so as not to overlap.

In addition, the present invention includes an embodiment of generating a content code used in the overwrite process for the stream and recording on the recording medium.

The present invention also includes an embodiment in which the overwrite information is recorded in the recording medium in a masked form.

The present invention also includes an embodiment in which the overwrite information is multiplexed into the stream and recorded on the recording medium.

In addition, the present invention includes an embodiment in which the overwrite information is configured in a separate file and stored in the recording medium.

In addition, the present invention includes an embodiment in which the overwrite information includes packet location information specifying a packet to be overwritten, and the packet location information is generated to designate different packets of the stream.

In addition, the present invention includes the overwrite start position information for specifying the position where the overwrite starts in the packet to be overwritten, and the overwrite information, if the overwrite information specifies at least one or more of the same packet, The start position information includes an embodiment in which the overwrite areas are not overlapped in the designated same packet.

The present invention also includes an embodiment in which the overwrite information is generated such that it does not include another reference packet between the reference packet used for designating the packet to be overwritten and the packet to be overwritten.

The present invention also provides a recording unit for recording data on a recording medium; And control the recording unit to record the stream on the recording medium, generate overwrite information specifying values to be overwritten in the stream and corresponding overwrite areas, and control the recording unit to record the overwrite information. Recording on a medium, wherein the controller generates the overwrite information so that the overwrite areas do not overlap.

The present invention also includes an embodiment in which the control unit generates a content code used in the overwrite process for the stream, and controls the recording unit to record the content code on the recording medium.

The present invention also includes an embodiment in which the controller controls the overwrite information to be recorded on the recording medium in a masked form.

The present invention also includes an embodiment in which the controller controls the overwrite information to be multiplexed into the stream and recorded on the recording medium.

The present invention also includes an embodiment in which the controller controls the overwrite information to be recorded in the recording medium as a file.

The present invention also includes an embodiment in which the controller generates the overwrite information such that packet position information specifying a packet to be overwritten specifies different packets in the stream.

Also, when the overwrite information designates at least one packet having the same overwrite information, the control unit specifies overwrite start position information for designating a position at which an overwrite starts in a packet to be overwritten within the specified same packet. And generating the overwrite information to designate non-overlapping overwrite areas.

The present invention also includes an embodiment in which the controller generates the overwrite information so that the control unit does not include another reference packet between the reference packet used for designating the packet to be overwritten and the packet to be overwritten.

In addition, the present invention provides a data reproduction method for reproducing a stream, comprising: checking overwrite information specifying values and overwrite regions to be overwritten in the stream, and corresponding to each overwrite region designated by the overwrite information. By overwriting the overwrite value, the overwritten stream is reproduced, and the overwrite information is defined such that the overwrite areas do not overlap.

In addition, the present invention includes an embodiment in which the overwrite information is stored in a separate file and is defined so as not to include another reference packet between the reference packet used for designating a packet position to be overwritten and the packet to be overwritten. do.

In addition, the present invention provides a data reproducing apparatus for reproducing a stream, comprising: a reader unit for reading data from a recording medium; And controlling the reader unit to read overwrite information on the stream and the stream from the recording medium, overwrite an overwrite value corresponding to each overwrite region designated by the overwrite information, and overwrite the overwritten stream. And a controller for controlling the reproduction, wherein the overwrite information is defined so that the overwrite regions do not overlap.

In addition, the present invention is implemented so that the overwrite information is stored in a separate file on the recording medium, and defined so as not to include another reference packet between the reference packet used for designating the packet to be overwritten and the packet to be overwritten. Include an example.

In addition, the present invention provides a data reproduction method for reproducing a stream, comprising: checking overwrite information according to reference packets used for designating a packet to be overwritten in the stream, A packet is reproduced by overwriting an overwrite value included in the overwrite information, wherein the overwrite is applied to the stream based on the order of the reference packet. .

The invention also includes an embodiment in which the overwrite is applied to the stream in the order of the reference packet.

The invention also includes an embodiment in which the overwrite is applied to the stream in the reverse order of the reference packet.

The invention also includes an embodiment in which the overwrite is applied to the stream in the order set by the provider of the stream.

In addition, the present invention provides a data reproducing apparatus for reproducing a stream, comprising: a reader unit for reading data from a recording medium; The reader unit reads the overwrite information on the stream and the stream from the recording medium, overwrites the overwrite value corresponding to the packet to be overwritten by the overwrite information, and overwrites the overwritten stream. And a control unit for controlling the reproduction to be performed, wherein the overwrite information is defined according to reference packets used for designating a packet to be overwritten in the stream, and the control unit transmits the stream to the stream based on the order of the reference packets. Provided is a data reproducing apparatus characterized by applying an overwrite.

The present invention also includes an embodiment in which the controller applies the overwrite to the stream in the order of the reference packets.

The present invention also includes an embodiment in which the controller applies the overwrite to the stream in the reverse order of the reference packets.

The present invention also includes an embodiment in which the controller applies the overwrite to the stream in the order set by the provider of the stream.

The present invention also provides a stream area for storing streams; And a security area for storing overwrite information according to reference packets used for designating a packet to be overwritten in the stream. The overwrite information includes an overwrite value and an overwrite area defined based on the order of the reference packets.

In addition, the present invention provides a data recording method for recording a stream, the method comprising: generating overwrite information according to reference packets used for designating a packet to be overwritten in the stream, and recording the overwrite information on the recording medium; The overwrite information is generated to designate a value and an overwrite area to be overwritten in the stream based on the order of the reference packets.

In addition, the present invention provides a data recording apparatus for recording a stream, comprising: a recording unit for recording data on a recording medium; And a controller configured to generate overwrite information according to reference packets used to designate a packet to be overwritten in the stream, and to control the recording unit to record the overwrite information on the recording medium. A data recording apparatus is characterized in that a value and an overwrite area to be overwritten in the stream are set based on a sequence of reference packets.

Hereinafter, the present invention will be described using an optical disc, in particular, a "Blu-ray Disc (BD)" as a recording medium for convenience of explanation, but the technical concept of the present invention can be applied to other recording media including HD-DVD. Equally applicable is obvious.

In this regard, in the present invention, "storage" is a kind of storage means provided or connected to the optical recording / reproducing apparatus 10, and means an element that a user can arbitrarily store and utilize necessary information and data. Data with persistence may be stored in storage 15. Examples of storage currently used generally include a flash memory provided in the data recording and reproducing apparatus 10, and a USB memory, HDD memory, or memory card connectable to and removable from the data recording and reproducing apparatus 10. have.

In particular, in the context of the present invention, " storage " may also be utilized as a means for storing data associated with a record carrier (e.g. a Blu-ray disc) and stored in storage in association with the record carrier. The data is generally data downloaded from the outside.

In this regard, it is also possible to directly read some permitted data from the recording medium, or to generate system data (e.g., metadata, etc.) related to the recording and reproducing of the recording medium and to store it in the storage.

In this regard, in the present invention, for convenience of description, the data recorded in the recording medium is referred to as " original data ", and the data related to the recording medium among the data stored in the storage is " additional data " data) ".

In addition, in the present invention, the term "Title" refers to a playback unit that forms an interface with a user. Each title is linked to a specific object. In particular, a stream related to the title recorded in the disc is reproduced in accordance with a command or a program in the object. In the present invention, for the convenience of description, titles that support seamless multi-angle, multi-story, language credits, director cuts, etc., among the titles in which high-definition video information is recorded by an MPEG compression method in a disc, are particularly referred to as "HDMV titles. (Title) ". Also, titles that are recorded by a Java program that supports high-activity by updating the title in the recording medium or connecting with the network among the titles in which high-definition video information is recorded by MPEG compression method are " BD-J Title. "

Figure 1 is shown to aid the conceptual understanding of the present invention, and is shown to show an example of the integrated use between the optical recording and playback device 10 and the peripheral device.

In this regard, the "optical recording and reproducing apparatus 10" of the present invention is a device capable of recording or reproducing optical discs of various standards, and depending on the design, it is possible to record and reproduce only optical discs of a specific standard (for example, BD), depending on the design. It may also be possible to play back without recording. However, in consideration of the linkage between the optical disc and the peripheral device to be solved in the present invention, an optical disc player or an optical disc recorder for recording and reproducing an optical disc will be described below. . In this regard, it is already well known that the "optical recording and reproducing apparatus 10" of the present invention can be a "drive" that can be embedded in a computer or the like.

In addition to the function of recording and reproducing the optical disc 30, the optical recording and reproducing apparatus 10 of the present invention receives an external input signal, processes the signal, and delivers the signal to a user through another external display 20. Will have In this case, there is no particular limitation on the external signals that can be input, but digital multimedia broadcasting and the Internet will be representative external input signals. In particular, the Internet can be easily accessed by anyone at present. As a medium, specific data on the Internet can be downloaded and utilized through the optical recording and playback apparatus 10.

In this regard, a person providing content as an external input source is collectively called a "content provider (CP)".

In addition, in the present invention, content refers to data provided by an author of a recording medium as content constituting a title.

In particular, the present invention provides a method and apparatus for preventing content from unauthorized copying / distribution, a method and apparatus for reproducing content to which the method is applied, and a recording medium storing the content. Through this, it is an object of the present invention to prevent plunder of content caused by malicious existence such as unauthorized copying or distribution of content.

The original data and the local data will be described in detail. For example, the multiplexed AV stream for a specific title is recorded as the original data recorded in the optical disc, and the original data is used as the international data on the Internet. If you provide an audio stream (e.g. English) that is different from the audio stream (e.g. Korean) of the user, the user may download an audio stream (e.g. English), which is an international data on the Internet, depending on the user. There may be a request to play with the AV stream, or to play only the local data. To enable this, the association between the original data and the local data is defined, and the data is managed / played according to the user's request. A systematic method is needed.

For convenience of explanation, the signal recorded in the disk is referred to as the original data, and the signal existing outside the disk is referred to as the local data, but this is classified according to the method of acquiring the respective data. National data is not necessarily limited to specific data. Thus, data of any attribute existing outside the optical disk and associated with the original data is possible as the local data. The local data may be downloaded for each index file, playlist file (* .m2ts), clip information file (*, clpi), or may be downloaded in content unit or title unit. .

In this regard, in order to realize the needs of the user, it is essential to have a file structure associated with the original data and the international data. Hereinafter, a file structure and a data recording structure usable on an optical disc through FIG. When described in detail as follows.

First, Fig. 2 shows the data file structure of the present invention. Note that the file structure of the present invention is not limited to the names and locations described below. In other words, the directories and files should be understood by their meaning and not by name and location.

The file structure of the present invention includes at least one BDMV directory (BDMV) under one root directory. In the BDMV directory (BDMV), an index file ("index.bdmv") and an object file ("MovieObjet.bdmv") exist as general file (parent file) information for ensuring interactivity with a user. . In addition, as a directory having information on the data recorded on the physical disk and a method of playing the same, the playlist directory (PLAYLIST), clip information directory (CLIPINF), stream directory (STREAM), auxiliary directory (AUXDATA), A BD-J object directory (BDJO) is provided. Hereinafter, the directory and the files included in the directory will be described in detail.

The metadata directory META includes a metadata file that is data about a data. That is, a search file, a metadata file for a disc library, and the like exist in the directory.

The BD-J object directory (BDJO) contains a BD-J object file for playing a BD-J title.

The auxiliary directory (AUXDATA) contains additional data files required for disc playback, for example, a "Sound.bdmv" file that provides sound when executing interactive graphics, fonts for disc playback ( font) file "11111.otf".

The stream directory STREAM contains files for an AV stream recorded in a specific format in the disc. The most common case is that each stream is recorded as a well-known MPEG-2 transport packet, and has an extension of the stream files (01000.m2ts, 02000.m2ts). * .m2ts " In particular, a stream in which all of the video / audio / graphic information is multiplexed is called an AV stream, and a title is configured as at least one or more AV stream files.

The clip information directory CLIPINF is composed of clip stream files (01000.clpi, 02000.clpi) corresponding to each of the stream files ("* .m2ts"). The clip information file is a database file for a clip. In particular, the clip information file ("* .clpi") records attribute information and time information (timing information) of the corresponding stream file ("* .m2ts"). Relatedly, a clip information file ("* .clpi") corresponding to a stream file ("* .m2ts") and a stream file ("* .m2ts") one-to-one is named and named "clip". That is, "clip" is data including both a stream file ("* .m2ts") and a clip information file ("* .clpi").

The playlist directory (PLAYLIST) consists of playlist files ("* .mpls"), which are database files for playlists, and each playlist file ("* .mpls") contains a specific clip to be played. It includes at least one PlayItem (PI) and a SubPlayItem (SPI) that specify a playing interval, and the Playitem (PI) and the subplayitem (SPI) are specific clips to be played. Contains information about the playback start time (IN-Time) and playback end time (OUT-Time) of the (clip).

In this regard, a process played by the at least one playitem PI in a playlist file is referred to as a "main path", and a process played by each subplayitem SPI is referred to as a "sub". Sub path ". The main path must exist in a playlist file, and the sub path exists at least one or more according to necessity depending on the existence of a sub-playitem (SPI). As a result, the playlist file becomes a basic reproduction management file unit in the entire reproduction management file structure for reproducing a desired clip by combining at least one playitem.

The file structure of the present invention also includes a BDSVM directory (BDSVM) under the root directory. The BDSVM directory is a directory structure for a security virtual machine (Security VM). Under the BDSVM directory, there is a content code file ("ContentCode.svm") that stores a content code. The content code file also contains all necessary information (eg, a scrambled fixup table) used by the content code. In addition, the BDSVM directory has a backup directory where a backup file of the content code files is located as a subdirectory. The security virtual machine will be described in detail with reference to FIG. 7.

In this regard, " content code " is a type of decoding software stored on a recording medium and provided to an optical recording / reproducing apparatus, for interacting with a user or querying a player and player peripherals or drivers. Control the playback process. If a security problem is detected, the content code delivers an appropriate response or countermeasure.

3 is shown to help conceptually understand the media transform. The content code is involved in the decoding of the content and has the ability to transform the content. The modification may include modifications such as inserting forensic marks into the clip AV stream, as well as modifications that restore to their original form for decoding. Such a transformation of the content code is called a media transform. The involvement of the content code in the decoding process means that an illegally copied title or media key cannot be simply transmitted over the Internet because the content code operates in the form of converting the content.

Referring to FIG. 3, in providing content, a content provider may modify a portion of a transport stream packet and provide it to a playback device. The modified packet must be restored to its original form and decoded before it can be displayed in a form that a user can see. For example, the content provider may modify the 'k' bytes in a particular packet and provide it to the playback device. The content including the modified packet is displayed in a form that can be viewed by the user only after it is restored to its original form.

Content code is involved in the decoding of the content and has the ability to transform the content. The modification may include modifications, such as inserting forensic marks into the clip AV stream, as well as modifications that restore to their original form for decoding. Such a transformation of the content code is called a media transform.

Specifically, the playback apparatus executes content code to restore the modified packet to its original form, and overwrites a specific value of 'k' bytes at the modified position. The packet to which the media transform is applied and the values overwritten in that packet are provided by a Fix-Up Table (FUT) entry.

In relation to this, there are two main methods of implementing a media transform according to the form in which the fixup table is provided to the playback apparatus. Specific implementation methods of the media transform will be described with reference to FIGS. 8A to 9B.

Fig. 4 shows a data recording structure recorded on an optical disc according to the present invention, and shows a form in which information related to the above-described file structure is recorded on the disc. As seen from the inner periphery of the disc, the file system information area (File System Information area) as the system information for managing the entire file, the index file, the object file, the playlist file, for playing the recorded stream (* .m2ts), The area in which clipinfo files and metadata files are recorded (also called "database area"), and the stream area or data area in which streams or JAR files composed of audio / video / graphics, etc. are recorded. It can be seen that it exists.

In addition, an area for recording file information and the like for reproducing contents in the data area is called a management area, and the file system information area and database area correspond to this area.

There is also a security area in which information related to content protection is stored. In the secure area, information related to the protection of the content recorded on the recording medium, such as a content code file, a certificate, a media key, a title key, and key conversion data, is recorded.

However, each region of FIG. 4 is provided as an example, and it will be apparent that the present invention is not limited to the arrangement structure of each region as shown in FIG. 4. Therefore, although FIG. 4 illustrates that the security area exists separately from the database area and the stream area, a certain part of the database area or a certain part of the stream stored in the stream area may be used as the security area.

5 shows an example of the overall configuration of the optical recording and reproducing apparatus 10 of the present invention.

First, the pickup 11 for reproducing management information including the original data recorded on the optical disc and the reproduction management file information, the servo 14 for controlling the operation of the pickup 11, and the reproduction signal received from the pickup 11; The signal processor 13 for restoring the signal to a desired signal value or modulating the signal to be recorded into a signal recorded on the optical disk and transmitting the signal to the optical disk is basically configured.

The pickup 11, the servo 14, the signal processor 13, and the microcomputer 16 may also be referred to as a recording / playback unit. In view of reproduction, the recording / reproducing section reads data from the optical disc 30 or the storage 15 and provides it to the decoder under the control of the controller. That is, the recording and reproducing section serves as a reproducing section (or reader section) for reading data from the viewpoint of reproduction. In terms of recording, the recording and reproducing section is a recording section which receives a signal encoded by the AV encoder 18 and records video, audio data and the like on the optical disc 30.

In addition, the controller 12 is responsible for controlling all the components in the data recording and reproducing apparatus 10.

In this regard, the controller 12 and the microcomputer 16 may be provided separately to operate. In addition, the functions of the controller 12 and the microcomputer 16 may be integrated to operate as one control unit. The control unit may be composed of a program (software) and / or hardware provided in the data recording and reproducing apparatus 10.

In addition, the control unit downloads and stores the local data existing in addition to the optical disk by the user command in the storage 15 and generates a virtual file structure for reproducing the recording medium data and the data in the storage. By using the generated virtual file structure (Virtual Package), the original data and / or the locational data are reproduced according to a user's request.

In this regard, a virtual package is created through a binding operation performed by a virtual file system, and includes an original clip composed of original data on disk stored in different areas. And a file structure for playing and managing a local clip composed of local data in storage.

In addition, the playback system 17 finally decodes the data under the control of the controller and provides it to the user. The playback system 17 is particularly composed of a decoder for decoding the AV signal, an object command or application relating to the reproduction of the specific title described above, and a player model for analyzing the user command input through the control unit to determine the playback direction. .

In this regard, in the present invention, the control unit reads the content code from the recording medium and provides it to the reproduction system 17. The content code is executed in the playback system 17 to participate in the decoding process of the content to perform a media transform to convert the content into a viewable form. Thus, even if a pirate of the content simply copies and distributes the content, the content becomes invisible unless the content code is executed. In addition, the control unit may insert information into the stream to track the optical recording / reproducing apparatus (hereinafter, referred to as an “emulator”) that has executed the content code to perform illegal copying. The information is called a forensic mark, and the process of inserting the forensic mark into the stream is called forensic marking. When the content is damaged through illegal copying or illegal distribution through forensic marking, it is possible to track an optical recording / reproducing apparatus that has damaged the content, thereby suppressing content copying and distribution.

In addition, the AV encoder 18 converts an input signal into a signal of a specific format, for example, an MPEG2 transport stream, and provides it to the signal processor 13 under the control of a controller for performing a function of recording a signal on an optical disc. Done. In the present invention, the AV encoder 18 may multiplex a fix-up table used for media transformation into a clip AV stream and provide it to the signal processor 13. The fixup table may be multiplexed into the clip AV stream in a scrambled form, and the mixed fixup table is called a masked fixup table. Also, the AV encoder 18 may convert the fixup table composed of separate files into a recordable signal and provide the signal to the signal processor 13.

6 shows an example of a recording medium reproducing apparatus utilizing the playback system of the present invention.

The term " playback system " refers to a collective playback processing means composed of a program (software) and / or hardware provided in the optical recording and playback apparatus. A system for reproducing a recording medium loaded in the optical recording / reproducing apparatus 10 as well as reproducing and managing data stored in storage (for example, downloaded from the outside) in association with the recording medium.

In particular, the playback system 17 includes "User Event Manager 171", "Module Manager 172", "HDMV Module 174", "BD-J Module 175", "Playback control engine 176). "," Presentation engine 177 "and" Virtual File System 40 ". In the present invention, the playback system includes a "Security Virtual Machine 178" that provides additional security for titles associated with the record carrier. The detailed description thereof is as follows.

First, the virtual file system 40 creates a virtual file structure by combining original data recorded on a recording medium with the local data of the storage. However, when there is no binding unit corresponding to the loaded recording medium in storage, the virtual file structure may be created using only a disc file structure in the recording medium. The virtual file system 40 provides a binding operation of the virtual file structure and controls an access mechanism to a file belonging to the virtual file structure.

The virtual file structure created by the virtual file system 40 is used in both the BD-J mode and the HDMV mode. The HDMV mode and the BD-J mode are playback modes of the recording medium, respectively, in which the HDMV title in the recording medium is played in the HDMV mode, and the BD-J title is played in the BD-J mode. The BD-J mode is based on the Java platform, and the Java platform used for the BD-J mode is also called the BD-J platform. Content providers can program the interactive Java application (s) on the record carrier in a variety of ways (e.g., applications for the entire disc, applications by title, etc.).

In relation to this, an application in the present invention refers to a program which is designed to perform a specific function directly to a user or another application as an execution unit. Applications use an application programming interface (API) to formally request or communicate work to other programs. An application running in the HDMV mode is called an HDMV application, and an application running in the BD-J mode is called a BD-J application. HDMV applications use the HDMV platform and BD-J applications use the BD-J platform to perform specific functions.

In this regard, the application may reside in a record carrier or storage 15. That is, JAR files constituting a specific application may exist in a recording medium or may exist in storage. However, the virtual file system 40 allows the JAR file to be accessed in both the HDMV mode and the BD-J mode, regardless of its origin.

In addition, the playback system 17 is a separate playback processing management means for reproducing the HDMV title and the BD-J title, and includes "HDMV Module 174" for the HDMV title and "BD- for the BD-J title, respectively." J Module 175 "is configured independently. The "HDMV Module 174" and the "BD-J Module 175" particularly receive a command or program in the above-described object (Movie Object or BD-J Object) (120 in FIG. 7), It has a control function to handle this. The "Metadata Manager 173" can perform title selection at any time under the user's control and provide the recording medium and title metadata to the user. The " HDMV Module 174 " and " BD-J Module 175 " separate commands or applications from the hardware configuration of the playback system, thereby enabling portability of the commands or applications. As a means for receiving and processing the command or application, the "Command processor 174a" in the "HDMV Module 174" and the "Application in which the application is executed in the" BD-J Module 175 "are executed. "Java VM 175a" which is a "Virtual Machine" and an "Application manager 175b" including an application management function that manages the lifecycle of an application are provided.

In addition, the user command is transmitted to the "HDMV Module 174" and the "BD-J Module 175" as well as the operations of the "HDMV Module 174" and the "BD-J Module 175" are controlled. "Module Manager 172" is provided. The "Playback Control Engine 176" which interprets the playlist file information recorded in the actual disc and performs the playback function according to the playback commands of the "HDMV Module 174" and the "BD-J Module 175". Is provided. In addition, a "Presentation Engine 177" is provided to decode a specific stream managed by the "Playback Control Engine 176" and display it on the screen. In particular, the " Playback Control Engine 176 " is a " Playback Control Functions 176a " that manages virtually all playback and playback states and playback environments (" Player status registers (PSR) " "Player Registers (176b)" which stores "General purpose registers (GPR)". In some cases, "Playback Control Functions (176a)" may mean "Playback Control Engine (176)". "Playback Control Functions 176a" handles a static scenario (130 in FIG. 7) included in the playlist.

In this regard, the HDMV title and the BD-J title each receive a user command of a separate method, and the method of performing the user command is independent of each other. A means for receiving a user command and delivering it to either "HDMV Module 174" or "BD-J Module 175" is required, which is in charge of "User Event Manager 171". Thus, for example, the "User Event Manager 171" may refer to the "Module Manager 172" or the "UO Controller 171a" if the received command is a user command by the "User Operation (UO) 171a". If the received command is a user command by "Key Event", it is transmitted to "Java VM 175a" in the "BD-J Module 175" for execution.

In addition, the playback system 17 of the present invention may include a "Metadata Manager 173", in which the "Metadata Manager 173" provides a user with a disc library and an enhanced search metadata application. application).

In the above-described playback system of the present invention, the "Module Manager 172", "HDMV Module 174", "BD-J Module 175", and "Playback Control Engine 176" are software-based. Processing is possible. Software processing is more useful in design than actual hardware configuration. However, the "Presentation Engine 177", the decoder 17b, and the plane are generally designed in hardware. In particular, in the case of a component processed by software (for example, reference numerals 172, 174, 175, and 176) may be configured as one part of the above-described control unit. The configuration of the present invention should be understood as meaning, and is not limited to hardware configuration or software configuration.

Recently, with the development of a reproducing apparatus capable of playing or copying content and the Internet, illegal copying and distribution of content has been a problem. In addition, in the case of high-resolution / high-quality content, the risk of hacking, etc. is also high, the need for protection is increasing. Accordingly, various methods for protecting content have been raised. The playback system of the present invention includes a security virtual machine (178) as a module for content protection.

The system model of FIG. 7 is shown based on the security tool of the secure virtual machine 178 and shows the playback system and the secure virtual machine 178 of the recording medium navigation system.

The Security VM 178 included in the system model of the present invention provides additional security to titles recorded on the recording medium of the present invention. Titles to which the additional security is applied are also referred to as self-protecting digital content (SPDC). The main feature of the additional security is renewability, whereby the security mechanism of content playback for each content can be updated by the use of the secure virtual machine 178. The updateability is realized by content code 110 running on the secure virtual machine 178. Hereinafter, the security virtual machine 178 will be described in detail.

The secure virtual machine 178 provides the content owner with discovery, media transform, forensic mark, run native, application layer communication, and the like. A security tool such as an optical recording / reproducing device storage slot or the like is provided.

Discovery tools provide information about the playback environment to detect malicious environments and attacks. One of the most serious attacks on content owners, an imitator, pretends to be a legitimate player and plays content in an incorrect way. To counter this kind of attack, secure virtual machine 178 uses discovery and discovery random access memory (RAM) to distinguish legitimate players from mimics. Once the copycat is detected, other security tools can prevent playback of the content.

As described above, content code 110 may use media transforms to define modifications to be applied to the content stream as part of the decoding process. Once the imitator is detected by discovery, the secure virtual machine 178 ) Does not do anything for the media transform, so that the content cannot be played back normally in the imitator.

A forensic mark is a signal embedded in the content that is not recognized by the user when the content is played but can be detected by a special detector. In the media transform process, forensic marks using identifiable information can be inserted into the stream to be reproduced. Forensic marks themselves do not prevent attacks on content owners. However, since the information specific to the optical recording and reproducing apparatus is inserted into the played back output content, the content owner can check the forensic mark in the leaked content when the content is leaked to the public. The optical recording and reproducing apparatus which illegally copied and distributed the content can be detected and held responsible.

In addition, the secure virtual machine 178 finds or fixes a security flaw in the optical recording / reproducing apparatus. The content code 110 running on the native, secure virtual machine 178 exchanges data with an application layer. Application layer communication capabilities, and non-volatile storage used by the content code 110, Player Storage Slots.

Through such a security tool, the secure virtual machine 178 can provide updateability to protect content from various types of attacks. In addition, the use of discovery can detect the copying machine and restore the combination of the optical recording and reproducing apparatus.

In this regard, the secure virtual machine 178 may be implemented as part of a control unit as software, or may be implemented as an independent module as hardware.

Referring to Figure 7, the process of the secure virtual machine 178 will be described in detail. The secure virtual machine 178 is composed of two virtual machine processes, a background VM process and an interrupt VM process.

If there is no time-critical operation (eg, security checks) at the time that the secure virtual machine 178 should perform, then the secure virtual machine 178 may be configured to have the content code 110 Operate in background mode with no fixed timing. In the background mode, the secure virtual machine 178 need not operate over time, and the optical record / playback apparatus may alternate between providing processor time to the secure virtual machine 178 and performing other actions.

The two virtual machine processes share a fixed size memory area. The memory area is called a virtual machine memory space. The virtual machine memory space is a working memory for the background virtual machine process and the interrupt virtual machine process, and stores the content code 110 and its data or variables. The content code 110 recorded on the recording medium at the start of playback of the title is loaded into the virtual machine memory space, and the background virtual machine process and the interrupt virtual machine process read / write to the virtual machine memory space. The secure virtual machine 178 includes a random access memory (RAM) in addition to the normal virtual machine memory space. Discrete RAM reads data from non-confidential portions of the actual memory space of the optical recorder software.

In this regard, before the data of the content code file is stored in the virtual machine memory space, the secure virtual machine verifies the signature of the content code file. The content code 110 must be signed by the secret key of the owned trusted certificate authority. If the verification fails, the secure virtual machine does not read the data of the content code file. In this case, since the content code 110 is not executed, the media transform cannot be applied to the content.

An interrupt virtual machine process is provided for the optical recording and reproducing apparatus to perform operations requiring a result from the secure virtual machine 178 within a limited period of time. For example, to transform the clip AV stream 140 into its original form via a media transform, a secret parameter and associated values are needed. The secret parameter is provided by an interrupt virtual machine process of the secure virtual machine 178. In this case, "Playback Control Functions" (176a) invokes the interrupt virtual machine process and activates it. In the active mode, the interrupt virtual process process calculates the assigned content code 110 to provide a secret parameter to the transform function, return to non-active mode, and the background virtual machine process is resumed.

In this regard, the execution mode of the secure virtual machine 178 includes a media initialization mode, a background mode, a title initialization mode, a secret parameter calculation mode, an application request mode, and a title termination mode. When the recording medium is loaded, the secure virtual machine 178 operates in the media initialization mode. In media initialization mode, the interrupt virtual machine process is activated and media access occurs. When the content code 110 initializes the entire recording medium, the content code 110 enters the background mode. In background mode, the background virtual machine process runs.

When execution results from the content code 110 running on the secure virtual machine 178 are needed, the "Module Manager 172", "Playback Control Function (176a)" and "Command Processor (174a)" Causes an interrupt. When an interrupt occurs, the state moves to that mode. For example, when the "Module Manager 172" attempts to start playing a title, it is in the title initialization mode. When the "Playback Control Engine 176a" requires the calculation of a secret parameter, it is in the secret parameter calculation mode. When " Command Processor 174a " wants to change the state of " Player Registers 176b ", it enters the application request mode state. When the "Module Manager 172" wants to stop the playback of the entire recording medium, it enters the media termination mode. When an interrupt occurs in the background mode, the background virtual machine process is stopped and the interrupt virtual machine process is activated. When the content code 110 finishes the process for the interrupt, it returns to the background mode state, the interrupt virtual machine process is terminated, and the background virtual machine process is resumed.

The present invention relates to a media transform, in which a transform function 179 plays an important role in a security tool called a media transform. Transform function 179 plays an important part of the record carrier update mechanism. The transform function 179 is located outside the secure virtual machine 178, and the masked fix-up table entries are stored in the secret parameters calculated by the secure virtual machine 178. The media transform is applied to the clip AV stream 140 in combination with the (SPs) and forensic mark ID (FM_ID) values. The transform function 179 may be included in the controller in software, but may be designed in hardware as a separate device for performing media transform.

In this regard, the secret parameter is a value generated by the content code 110 for each secret parameter segment for the media transform. All clip AV streams are divided into secret parameter segments, and a secret parameter ID is assigned to each secret parameter segment. Each secret parameter applies to all fixup table entries contained in one secret parameter segment.

A fixup table is used for the media transform, which is divided into a series of fix-up table entries. Depending on the type of fixup table, a method of implementing a media transform varies. One way to implement the media transform is to use a masked fixup table multiplexed onto the clip AV stream, and another method is to use a masked fixup table stored as an independent file on the recording medium. Hereinafter, the implementation of the media transform will be described in detail with reference to FIGS. 8A to 9B.

8A through 8B illustrate a schematic diagram of a media transform using a multiplexing fixup table and a data structure of a fixup table.

Referring to FIG. 8A, when a masked fixup table 150m multiplexed in a clip AV stream is used for media transformation, the actual fixup entry (unmasked fixup entry) 200 is a masked fix. It may be calculated by a logical operation 179a (eg, an XOR operation) between the up entry 200m and the secret parameters provided by the secure virtual machine 178.

Referring to FIG. 8B, a program map table packet in a form in which a fixup table used in the media transform of the present invention is masked by a logical operation (eg, an exclusive OR) with a secret parameter provided by a secure virtual machine. (Program Map Table Packet, PMT packet) is stored in the "private data" field in the system use descriptor (system_use_descriptor). The "private data" field includes content protection information for the clip AV stream file. The fixup table may include a secret parameter identifier (SP_ID) of a secret parameter segment (SP Segment) to which the PMT packet belongs, a fixup entry (FixUpEntry) to be described with reference to FIG. 10, and an optical recording / reproducing apparatus to perform media transformation. It includes " Offset_SPN_to_next_FixUp " indicating the number of packets from each PMT packet to which fixup entry 200 needs to be confirmed to the next PMT packet. The secret parameter identifier is not masked and is the same as the secret parameter identifier for the secret parameter segment in which the fix-up entry 200 exists. Using the " Offset_SPN_to_next_FixUp ", the optical recording / reproducing apparatus can find the next PMT packet that needs to be identified. In this case, the optical recording / reproducing apparatus may not check the PMT packets between the current PMT packet and the PMT packet pointed by the " Offset_SPN_to_next_FixUp ".

Referring to FIG. 8A, a media transformation by a fixup table multiplexed onto a clip AV stream is described. The optical recording / reproducing apparatus 10 includes a clip AV stream including a masked fixup table 150m from a recording medium. Read 140. The content may be encrypted and provided to the optical recording / reproducing apparatus 10. In this case, the content must be decoded before it can be decoded.

Encryption refers to a kind of copy protection method that prevents illegal copying, redistribution, and editing of content provided by a content provider by modifying data using a specific algorithm. It serves as a kind of lock that prevents unauthorized access to the decrypting content of the content, and the particular algorithm serves as a key to lock the lock. Therefore, the specific algorithm used for encrypting the content may be referred to as an encryption key. In order to play the encrypted content, a means for decrypting a specific algorithm used to encrypt the content should be provided. The specific algorithm decryption means serves as a kind of key to unlock the lock. When a key is provided, the key is used to decrypt the algorithm used for content encryption and to restore the content to its original form, which is called decryption. When the content is encrypted in title units, a key used for encrypting and decrypting the title is called a title key Kt. The optical recording / reproducing apparatus 10 decrypts the clip AV stream encrypted using the title key Kt (179c). The decoded clip AV stream is provided to a demultiplex 179e via a buffer 179d.

The content code 110 stored in the recording medium is loaded into the secure virtual machine 178, executed in the secure virtual machine 178, and provided with a clip ID (Clip_ID) provided by the "Playback Control Engine 176". And secret parameter ID (SP_ID), the secret parameter ID and forensic mark ID (FM_ID) are output along with each secret parameter. The forensic mark ID is generated based on the information for identifying the optical recording and reproducing apparatus, and the forensic mark is inserted into the clip AV stream using the forensic mark ID.

In this regard, the clip ID provided from the "Playback Control Engine 176" to the secure virtual machine 178 is equal to the number used for the file name of each clip. For example, 'Clip_ID = 123' indicates a clip referring to the clip information file '00123.clpi' and the stream file '00123.m2ts'.

In the present invention, the clip AV stream 110 is intentionally corrupted and then encrypted and recorded on the recording medium. The optical recording / reproducing apparatus 10 restores the modified clip AV stream 110 to its original form through media transformation by the transform function 179. The transform function 179 controls a demultiplexer 179e to extract a masked fix-up entry 200m from the decoded clip AV stream 110. Through the logical operation 179a between the extracted masked fix-up entry 200m and the secret parameter output by the content code 110, the actual fix-up entry 200 used for the media transform is calculated.

10 shows an example of the structure of the fix-up entry 200 of the present invention, and the fix-up entry 200 includes information 210 for identifying a process using the fix-up table. The process identification information (type_identifier) 210 indicates whether media transformation or forensic marking is performed. For example, if the process identification information is set to '00b', it means that no media transform is applied, and if it is set to '01b', it means to apply a media transform, and '10b' indicates to perform forensic marking. it means.

In addition, the fix-up entry 200 includes information 220 indicating the bit position FM_ID_bit_position of the foresic mark ID for the forensic marking. When the forensic mark ID bit position 220 is set to a specific value (for example, '1'), the overwrite operation in the fixup entry is performed. However, when the bit designated by the forensic mark ID bit position information 220 included in the fixup table among the bits of the forensic mark ID is set to '0', an overwrite value included in the fixup table (overwrite value) ) 270 and 280 are not overwritten to the stream.

In addition, the fix-up entry 200 may include a relative source packet number Relative_SPN_1 230 from the PMT including the fix-up table to the first modified packet, and a relative source from the modified packet to the second modified packet. A packet number (Relative_SPN_2) 240, and an overwrite value ("Overwrite_value_1" 270 and "Overwrite_value_2" 280) to be overwritten in packets designated by the relative source packet numbers, respectively.

In relation to this, when the fixup table is multiplexed onto the clip AV stream 110, the PMT packet including the fixup table serves as a reference for calculating the "Relative_SPN_1" 230. 9A to 9B, when the fixup table is given as a separate file, the packet number of the packet (Base SPN 400 in FIG. 9B) to be used for the calculation of the "Relative_SPN_1" 230 is given separately. . Hereinafter, the packet number for calculating the "Relative_SPN_1" 230 will be described as a reference source packet number as described above.

In addition, it includes information ("Byte_position_1" 250 and "Byte_position_2" 260) indicating the start byte position of the transformed data in the designated packets. The information 250 and 260 indicating the start byte position specifies a position at which the overwrite starts in the packet in which the overwrite values 270 and 280 are designated, and the overwrite value is overwritten from the start position.

In this regard, the clip AV streams of the present invention are divided into secret parameter segments (SP Segments), and a secret parameter identifier is assigned to each secret parameter segment in each clip AV stream. The content code 110 generates a secret parameter for each secret parameter segment and provides it to the secure virtual machine 178. The secret parameter is used to calculate the actual fix-up entries 200 through logical operations with the masked fix-up entries 200m. The number of secret parameters for each clip is equal to the number of secret parameter segments in that clip, and applies to all fixup entries 200 in one secret parameter segment.

Referring to FIG. 8A, the optical recording and reproducing apparatus 10 has a forensic mark ID in which the process identification information 210 in the fix-up entry 200 is '01b' or the process identification information 210 is '10b'. It is checked whether the bit of the forensic mark ID designated by the bit position information 220 is '1'. If the condition is satisfied, the media transform process continues, so that the overwrite values 270 and 280 included in the fixup table are overwritten on the packets specified in the fixup table of the transport stream, respectively, 179b. And deformation occurs. If the process identification information is set not to perform media transformation (eg, '00b'), the clip AV stream 140 is not modified. In addition, when the forensic marking is set to perform forensic mark, but the forensic mark ID bit position information 220 indicates that the bit of the forensic mark ID is not '1' (when set to '0'), the overwrite values are specified. Is not overwritten.

Extracting the masked fixup table 150m from the decoded clip AV stream in the above-described process, calculating an actual fixup table, and overwriting an overwrite value in a specific packet using the fixup table (179b); Are repeated for the entire clip AV stream.

The overwritten clip AV stream is decoded by the decoder 179f and provided to the user via the display 20.

9A-9B show a schematic diagram of a media transform using a fixup table stored as a file and the data structure of the fixup table.

Referring to FIG. 9A, the optical recording and reproducing apparatus 10 preloads the masked fixup table 150m stored in a separate file from the secure virtual machine 178 from the recording medium before starting the reproduction of the content. The masked fix-up table may be obfuscated and recorded on a recording medium (150f). In this case, the secure virtual machine 178 de-obfuscates the obfuscate masked fix-up table 150m, and the masked fix-up table for the title at the start of playback. Send 150m to the transform function module 179.

Referring to FIG. 9B, the fixup table 150 includes fixup entries for all clips used in one title. The table has a block structure to be logically operated with each secret parameter. Each FixUpEntry 200 in the FUT block 300 is masked by an exclusive OR of the associated secret parameter value specified by the secret parameter ID.

All fixup entries 200 in one fixup block 300 are located in a secret parameter segment corresponding to a secret parameter ID associated with the fixup block 300. Fixup block 300 has a reference source packet number (Base SPN) 400 for each fixup entry 200 included in the fixup block 300. The reference source packet number 400 corresponds to the source packet number of the PMT packet having the system usage descriptor described with reference to FIGS. 8A to 8B. The relative source packet number Relative_SPN_1 230 in the fix-up entry 200 may be calculated from the reference source packet number.

The optical recording / reproducing apparatus 10 scans the masked fixup table to find the necessary fixup block to be used at the current playback position of the clip AV stream 140. The content code 110 loaded from the recording medium is executed in the secure virtual machine 178, corresponding to a command invoked by the "Playback Control Engine 176", with a secret parameter with each secret parameter. Outputs ID and forensic mark ID. A clear fix-up entry 200 may perform logical operations (eg, for example) between a secret parameter value from the secure virtual machine 178 and a masked fix-up entry 200m of the masked fix-up table 150m. Exclusive logical OR) 179a.

In this regard, the process of finding the required fixup block and producing a clear fixup entry is repeated for the entire clip AV stream.

The optical recording / reproducing apparatus 10 reads out the clip AV stream 140 from the recording medium and, if the clip AV stream is encrypted, decrypts it with the title key Kt (179c). Referring to FIG. 10, the optical recording / reproducing apparatus 10 checks the process identification information 210 from the fix-up entry 200 related to the current playback position of the clip AV stream, and determines whether to continue the media transform process.

When the process identification information 210 is '01b' or the process identification information 210 is '10b' and the bit of the forensic mark ID designated by the forensic mark ID bit position 220 is '1', media The transform process continues. In other cases, the media transformation defined in the fixup table is not applied, and the process returns to the process of reading the clip AV stream from the recording medium and decrypting it using the title key (179c).

The overwrite function 179b in the transform function 179 is information indicating the packet position to be modified included in the fix-up entry 200 (Relative_SPN_1 230 and Relative_SPN_2 240), and the overwrite function is performed on the modified packet. Each fix using information (Overwrite_value_1 (270) and Overwrite_value_2 (280)) indicating a value to be used and information (Byte_position_1 (250) and Byte_position_2 (260)) indicating the starting byte position of the transformed data in the packet to be modified. Perform overwrite 179b per up entry.

11 illustrates an example in which a media transform is applied according to the present invention. As described above, the packet to be transformed by the fix-up entry 200 and the byte position in the packet are determined. In this case, different fix-up entries designate the same packet so that an area overwritten may overlap. In this case, a plurality of transforms may be applied to one packet, and thus may not be correctly restored to the original stream.

For example, by the packets specified by FUT Entry 1 and the byte positions to be modified of the packets, the packets specified by FUT Entry 2 and the byte positions of the packets. When the regions to which the overwrite is to be applied overlap in whole or in part, the bit string of the packet may vary according to the order of applying the overwrite function using each fix-up entry.

That is, the modified region of the stream, which is designated by the relative source packet numbers 230 and 340 of the fix-up entry 1 and the fix-up entry 2 and the byte position information 250 and 260, may overlap. In this case, the stream to which Overwrite 1 using Fix-Up Entry 1 is applied and Overwrite 2 using Fix-Up Entry 2 is applied, and the overwrite 2 is applied first, and the overwrite 1 is applied. The stream applied may be different.

As a result, since the output stream is changed according to the overwrite order, an accurate media transformation may not be achieved. The present invention provides a method for solving the above problem.

12A-12C illustrate embodiments of a media transform according to the first method of the present invention.

The first method of the present invention allows the areas to be modified to be designated by fix-up entries so that the result of the media transform does not vary according to the overwrite order. The content provider must configure and provide the fixup table to the user so as to specify an area to be overwritten in the stream differently.

Referring to FIG. 12A, the content provider is different from packets designated by "Relative_SPN_1" and "Relative_SPN_2" included in fix-up entry 1 and packets designated by "Relative_SPN_1" and "Relative_SPN_2" included in fix-up entry 2. Fixup tables can be configured to In this case, since the packets to be modified designated by each fix-up entry are different, the same stream is provided to the decoder 179f regardless of the overwrite order.

In addition, referring to FIG. 12B, the content provider adjusts "Byte_position_1" and "Byte_position_2" included in Fix-Up Entry 1 and "Byte_position_1" and "Byte_position_2" included in Fix-Up Entry 2 to FixUp Entry 1. The fixup table may be configured such that the region overwritten by the overwrite and the region overwritten by the fix-up entry 2 do not overlap. Even if the same packet exists among the packets to be specified by the fix-up entries, if the overwritten portion of the packet is different, the output stream does not change according to the overwriting order.

For example, when the packet specified by "Relative_SPN_2" of fix-up entry 1 and the packet specified by "Relative_SPN_1" of fix-up entry 2 are equal, "Byte_position_1" of fix-up entry 2 is the fix-up entry. Must be equal to or greater than the sum of "Byte_position_2" and "Overwrite_value_2" of 1.

In addition, referring to FIG. 12C, the content provider may determine whether or not a base source packet number Base SPN, which is the basis for calculating the relative source packet number of the fix-up entry, and a packet designated by the fix-up entry. The fixup table may be configured such that there is no reference source packet number. For example, a different reference source packet number exists between base source packet number 1 (Base SPN 1) and packets to which overwrite 1 by fixup entry 1 corresponding to the base source packet number 1 is applied. Fixup tables are configured not to.

When the fixup table is configured according to the embodiments according to the first method of the present invention, the parts to be overwritten are not overlapped, and even if the overwrite order is changed, the result of the media transform is not changed. The control unit generates a fix-up table according to one of the embodiments according to the first method, controls the pickup 11 to record the fix-up table on a recording medium.

13A to 14B illustrate embodiments of a media transform according to the second method of the present invention, and FIGS. 13A to 13B illustrate applying media transforms in the order of a reference source packet number according to the second method of the present invention. 14A to 14B illustrate an embodiment in which the media transformer is applied in the reverse order of the reference source packet number.

The second method of the present invention is for the case where it is allowed to overlap portions of the transport stream to be modified. When the parts to be modified specified by the fix-up entries overlap, the result of the media transform may vary according to the application order of the overwrite. In this case, therefore, the application order of the overwrite needs to be determined.

13A to 13B, the optical recording / reproducing apparatus 10 may perform the overwrite function in the order in which the reference source packet numbers are processed in implementing the media transform. Referring to FIG. 13A, when a reference source packet number 1 is provided to a transform function module first and a reference source packet number 2 is provided next, the transform function is a fixup corresponding to the reference source packet number 1. Overwrite 1 with entry 1 is performed first. Referring to 13b, the optical recording / reproducing apparatus 10 performs overwrite 2 using fixup entry 2 corresponding to the reference source packet number 2 to the stream to which the overwrite 1 is applied. Therefore, the overlapping part of the overwrite areas designated by the fix-up entry 1 and the fix-up entry 2 has a bit string of the overwrite value by the fix-up entry 1.

In this regard, in the optical recording / reproducing apparatus of FIGS. 13A to 13B, in order for the deformed content to be restored to its original form through the media transform, the content provider performs an overwrite function in the order in which the reference source packet number is processed. In consideration of this, a fixup table should be constructed and provided.

14A to 14B, the optical recording / reproducing apparatus 10 may perform overwrite functions in the reverse order in which the reference source packet numbers are processed in implementing the media transform. Referring to FIG. 14A, when a reference source packet number 1 is provided to a transform function module first and a reference source packet number 2 is provided next, the transform function may have a fixup corresponding to the reference source packet number 2. Overwrite 2 using entry 2 is performed first. Referring to FIG. 14B, the optical recording / reproducing apparatus 10 performs overwrite 1 using fixup entry 1 corresponding to the reference source packet number 1 to the stream to which the overwrite 2 is applied. Therefore, the overlapping part of the overwrite areas designated by the fix-up entry 1 and the fix-up entry 2 has a bit string of the overwrite value by the fix-up entry 2.

In this regard, in the optical recording / reproducing apparatus of FIGS. 14A to 14B, in order for the deformed content to be restored to its original form through the media transform, the content provider performs an overwrite function in the reverse order in which the reference source packet number is processed. In consideration of this, the fixup table should be configured and provided.

In addition, the content provider of the present invention may determine the order of use of the fix-up entries to be applied in the media transform, and provide information on the order to the optical recording / reproducing apparatus. The controller in the optical recording and reproducing apparatus checks the information and performs overwriting on the stream in the order indicated by the information.

In this regard, although the case of two fix-up entries is illustrated as an example in FIGS. 11 to 14B, this is only an example, and it will be obvious that the present invention can be applied regardless of the number.

The present invention is not limited to the above-described embodiments, and as can be seen in the appended claims, modifications can be made by those skilled in the art to which the invention pertains, and such modifications are within the scope of the present invention.

According to the data reproducing method, the reproducing apparatus, and the data transmitting method according to the present invention described above, it is possible to track an optical recording and reproducing apparatus which has corrupted the contents by illegal copying or distribution by inserting the identifiable information into the reproduced content. It is possible to protect the content from malicious acts on the content, such as illegal copying and distribution.

Claims (39)

A stream area for storing the stream; And A security area for storing overwrite information specifying values and overwrite areas to be overwritten in the stream, The overwrite information is defined such that the overwrite areas do not overlap. The method of claim 1, And the recording medium includes a content code used in the overwrite process for the stream. The method of claim 1, The overwrite information is stored in the recording medium in a masked form. The method of claim 1, And the overwrite information is multiplexed into the stream and stored in the recording medium. The method of claim 1, The overwrite information is configured as a separate file and stored in the secure area. The method of claim 1, The overwrite information includes packet position information specifying a packet to be overwritten, And said packet position information is defined to specify different packets of said stream. The method of claim 1, The overwrite information includes overwrite start position information specifying a position at which an overwrite starts in a packet to be overwritten, And when the overwrite information designates at least one same packet, the start position information is defined such that overwrite areas do not overlap in the designated same packet. The method of claim 1, And the overwrite information is defined so as not to include another reference packet between the reference packet used for designating the packet to be overwritten and the packet to be overwritten. Record the stream to a record carrier, Generating overwrite information specifying values and overwrite areas to be overwritten in the stream and recording the overwrite information on the recording medium; And the overwrite information is generated so that the overwrite areas do not overlap. The method of claim 9, And generating a content code used in the overwrite process of the stream and recording the content code on the recording medium. The method of claim 9, And the overwrite information is recorded on the recording medium in a masked form. The method of claim 9, And the overwrite information is multiplexed into the stream and recorded on the recording medium. The method of claim 9, And the overwrite information is stored in the recording medium in a separate file. The method of claim 9, The overwrite information includes packet position information specifying a packet to be overwritten, And the packet position information is generated to designate different packets of the stream. The method of claim 9, The overwrite information includes overwrite start position information for designating a position at which an overwrite starts in a packet to be overwritten, And when the overwrite information designates at least one identical packet, the start position information is generated such that the overwrite areas do not overlap in the designated same packet. The method of claim 9, And the overwrite information is generated so as not to include another reference packet between the reference packet used for designating the packet to be overwritten and the packet to be overwritten. A recording unit for recording data on a recording medium; And Control the recording unit to record a stream on the recording medium, generate overwrite information specifying values to be overwritten in the stream and corresponding overwrite areas, and control the recording unit to write the overwrite information to the recording medium. Write in, And the control unit generates the overwrite information so that the overwrite areas do not overlap. The method of claim 17, And the control unit generates a content code used in the overwrite process for the stream, and controls the recording unit to record the content code on the recording medium. The method of claim 17, And the controller controls the overwrite information to be recorded on the recording medium in a masked form. The method of claim 17, And the controller controls the overwrite information to be multiplexed into the stream to be recorded on the recording medium. The method of claim 17, And the controller controls the overwrite information to be recorded on the recording medium as a file. The method of claim 17, And the control unit generates the overwrite information such that packet position information specifying a packet to be overwritten specifies different packets in the stream. The method of claim 17, If the overwrite information designates at least one packet of the same, The control unit generates the overwrite information such that the overwrite start position information specifying the position at which the overwrite starts in the packet to be overwritten specifies the overwrite regions that do not overlap in the designated same packet. Logger. The method of claim 17, And the control unit generates the overwrite information so as not to include another reference packet between the reference packet used for designating the packet to be overwritten and the packet to be overwritten. In the data playback method for playing a stream, Confirm overwrite information specifying values and overwrite areas to be overwritten in the stream, Rewrite the overwritten stream by overwriting a corresponding overwrite value in each overwrite area designated by the overwrite information. The overwrite information is defined such that the overwrite areas do not overlap. The method of claim 25, The overwrite information is stored in a separate file and is defined so as not to include another reference packet between a reference packet used for designating a packet position to be overwritten and the packet to be overwritten. A data reproducing apparatus for reproducing a stream, A reader unit for reading data from a recording medium; And The reader unit controls the reader to read overwrite information about the stream and the stream from the recording medium, overwrites an overwrite value corresponding to each overwrite area designated by the overwrite information, and the overwritten stream is overwritten. It includes a control unit for controlling to play, And the overwrite information is defined such that the overwrite areas do not overlap. The method of claim 27, The overwrite information is stored in a separate file on the recording medium, and data reproduction is defined so as not to include another reference packet between a reference packet used for designating a packet to be overwritten and the packet to be overwritten. Device. In the data playback method for playing a stream, Confirm overwrite information according to reference packets used to designate a packet to be overwritten in the stream, Replay the stream by overwriting the overwrite value included in the overwrite information in the packet to be overwritten specified by the overwrite information. And the overwrite is applied to the stream based on the order of the reference packet. The method of claim 29, The overwrite is applied to the stream in the order of the reference packet. The method of claim 29, And the overwrite is applied to the stream in the reverse order of the reference packet. The method of claim 29, The overwrite is applied to the stream in the order set by the provider of the stream. A data reproducing apparatus for reproducing a stream, A reader unit for reading data from a recording medium; And The reader unit reads the overwrite information for the stream and the stream from the recording medium, and overwrites an overwrite value corresponding to the packet to be overwritten specified by the overwrite information so that the overwritten stream is overwritten. It includes a control unit for controlling to play, The overwrite information is defined according to reference packets used to designate a packet to be overwritten in the stream, and the control unit applies the overwrite to the stream based on the order of the reference packets. Playback device. The method of claim 33, wherein And the controller applies the overwrite to the stream in the order of the reference packets. The method of claim 33, wherein And the controller applies the overwrite to the stream in the reverse order of the reference packets. The method of claim 33, wherein And the controller applies the overwrite to the stream in the order set by the provider of the stream. A stream area for storing the stream; And A security area for storing overwrite information according to reference packets used for designating a packet to be overwritten in the stream; The overwrite information includes an overwrite value and an overwrite area defined based on the order of the reference packets. In the data recording method for recording a stream, Generate overwrite information according to reference packets used for designating a packet to be overwritten in the stream, Record the overwrite information on the recording medium; And the overwrite information is generated to specify an overwrite area and a value to be overwritten in the stream based on the order of the reference packets. A data recording apparatus for recording a stream, A recording unit for recording data on a recording medium; And And a controller configured to generate overwrite information according to reference packets used for designating a packet to be overwritten in the stream, and to control the recording unit to record the overwrite information on the recording medium. And the controller controls a value to be overwritten in the stream and an overwrite area based on the order of the reference packets.

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