KR20090089639A - Method for recording or providing contents and apparatus thereof - Google Patents

Abstract

A method for recording or providing contents and an apparatus thereof are provided to record contents only in a specific disk. A disc key decoding unit(370) extracts the first disk key from the first disk loaded in a recording device. A controller(320) transmits the extracted first disk key to a server. The controller receives a title key about contents which is encrypted by using the first disk key. The controller determines whether the second disk key of the second disk currently loaded in the recording device is matched with the first disk key. When the second disk key is matched with the first disk key, the controller records the contents and the encrypted title key in the second disk.

Description

Method for providing or recording content and apparatus for performing the same

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a content providing or recording method and an apparatus for performing the method. More particularly, the present invention relates to a content recording method and an apparatus capable of recording content only on a specific disc to prevent unnecessary disc waste.

With the development of digital technology, various media signal recording devices such as digital TVs, DVD players, computers, etc., have been widely used. In addition, the development of communication technology has made it possible to transmit and receive a large amount of data in a short time through a wired or wireless communication network. Accordingly, the user can access a server operated by various content providers including a movie production company or a broadcasting station through a communication network, and can download content such as an audio signal, a video signal, or a text signal directly from the server to the user's recording device. It became. The user can record the downloaded content on a hard disk inside the recording apparatus or record the content on an external recording medium inserted in the recording apparatus, and play the same. Recording media capable of recording a large amount of data include a digital versatile disc (DVD), a blue-ray disc (BD), and the like.

Digital Right Management (DRM) technology is used to prevent users from illegally copying or tampering with content downloaded from a server. The user may use the content after being authorized by the content provider to release the DRM technology. As one of the DRM technologies, a content scrambling system (CSS) technology is used, which enables content to be played through a multi-step decryption process using multiple keys. CSS is a DRM for prohibiting illegal copying and playing of contents stored in a DVD to a HDD and also preventing recording and playing of contents stored in the HDD on another disk.

1 is a view for explaining a method of playing a DVD disk to which the CSS technology is applied.

Referring to FIG. 1, an encrypted disk key, an encrypted title key, and scrambled content are recorded on the DVD disk 110 to which the CSS technology is applied. A player key is assigned to a reproducing apparatus 120 for reproducing the DVD disc 110. The player key is a value for decrypting an encrypted disc key. Every player 120 capable of playing the disc 110 is assigned a unique player key. The disc key is a disc-specific value given to each disc 110 and is information for decrypting an encrypted title key. The disc key is encrypted with the respective player keys given to all recording apparatuses capable of recording or playing the disc, and recorded in the lead-in area of the disc 110. The title key is a unique value assigned to each title such as content, and is used to decrypt information encrypted in all of one title or part of one title. The title key is stored in the header section of the title in encrypted form.

When the user loads the disc 110 to the playback device 120 to play the content, the playback device 120 reads the encrypted disk key from the lead-in area of the loaded disk 110. The playback device 120 finds a disk key encrypted with the player key unique to the playback device 120 among the disk keys encrypted with the plurality of player keys, and extracts the disk key by decrypting it with the player key unique to the playback device 120. . The reproducing apparatus extracts the title key by decrypting the encrypted title key stored in the header section of the title to be reproduced using the disc key. The playback device 120 may descramble the scrambled content by using the extracted title key and play back the content recorded on the disc 110.

2 is a diagram illustrating a CSS managed recording system. The CSS Managed Recording system is a technology that downloads content through a communication network and records the downloaded content by applying CSS, which is the same content protection system as a commercial DVD title, on a blank disk. Referring to FIG. 2, the CSS managed recording system includes a recording device 200, a server 220, and a communication network 210. The recording device 200 is coupled with the server 220 via the communication network 210. The server 220 is operated by a content provider such as a broadcasting station or a movie production company. The server 220 stores an audio signal, a video signal, a text signal, or a metadata signal thereof.

The user may access the server 220 to log in, select a desired content, and download the content. The user loads the disc into the recording apparatus 200 to record the content downloaded from the server 220. The recording apparatus 200 reads out the encrypted disk key from the lead-in area of the loaded disk. The recording device 200 decrypts the disk key encrypted with the player key unique to the recording device, extracts the disk key, and transmits the extracted disk key to the server through the communication network 210. The server 220 encrypts the disc key received from the recording device 200 with the title key of the content to be recorded by the user to generate an encrypted title key and transmits the encrypted title key to the recording device 200 together with the scrambled content. The recording apparatus 200 may download the encrypted title key and the scrambled content from the server, and record the encrypted content and the title key capable of playing the content by decrypting the encrypted content on the disc.

As described above, the recording apparatus 200 transmits the disk key of the specific disk to record the content to the server 220, downloads the title key encrypted with the disk key from the server 220, and writes it to the disk along with the scrambled content. The scrambled content can be descrambled and played later. However, in some cases, the encrypted title key and scrambled content downloaded from the server 220 are recorded on the disc, and there is a problem in the recording apparatus 200, which causes recording to fail. In this case, the user sometimes records the encrypted title key and scrambled content downloaded to a new disc. In addition, when a user transmits a disk key of a specific disk to the server 220 and downloads an encrypted title key and scrambled content using the disk key from the server 220, the encryption downloaded by a user's error or the like. The title key and scrambled content may be recorded on a disc other than a specific disc.

In the above case, the apparatus for playing a disc decrypts the encrypted title key using the disc key assigned to the new disc. Since the encrypted title key is encrypted with the disc key of the previous disc, when the encrypted title key is decrypted using the disc key of the disc different from the disc key of the previous disc, a title key with a value different from the original title key is obtained. Is saved. Since the scrambled content cannot be decrypted with the title key having a value different from the original title key, the playback device cannot play the content. Therefore, if an encrypted title key generated using a disc key for a particular disc is recorded on a disc other than the particular disc, there is a problem that the disc is wasted because contents cannot be reproduced.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problem, and an object of the present invention is to provide a content recording method and apparatus capable of recording content only on a specific disc, thereby preventing unnecessary disc waste.

In addition, it is an object of the present invention to provide a content providing method that enables content recording only on a specific disc, thereby preventing unnecessary disc waste, and a server performing the method.

According to an aspect of the present invention to solve the above problems in the content recording method performed in the recording device to communicate with the server via a communication network, the first disk key of the first disk loaded in the recording device to the server Transmitting, from the server, receiving an encrypted title key generated by encrypting a title key for content with the first disk key, wherein the second disk key of the second disk currently loaded in the recording device is Determining whether it is the same as the first disk key, and if the second disk key is the same as the first disk key, recording the content and the encrypted title key to the second disk. A content recording method can be provided.

In a preferred embodiment, the determining whether the second disk key is the same as the first disk key may include decrypting the encrypted title key with the second disk key, and the content that identifies the content with the decrypted value. Transmitting to the server with an identifier and being notified by the server as to whether the decrypted value is equal to the title key of the content identified by the content identifier. Decrypting the encrypted first disk key recorded on the first disk with the player key of the recording device to obtain the first disk key; and converting the encrypted second disk key recorded on the second disk into the player key of the recording device. And decrypting to obtain the second disk key. The recording of the content and the encrypted title key on the second disc may include: if the decrypted value is notified by the server to be the same as the title key for the content, the second disc may be read. And determining the same as the disk. Further, when notified from the server that the decrypted value is not the same as the title key for the content, a screen is displayed indicating that the content and the encrypted title key cannot be recorded on the second disc. The method may further include outputting the same. In addition, whether the second disk is the same as the first disk is determined by using an encrypted second disk key extracted from the second disk and an encrypted first disk key extracted from the first disk. Characterized in that it comprises a step. The method may further include storing the encrypted title key received from the server together with the content and the encrypted first disk key as a group, and storing the content and the encrypted title key as the second disk. Recording in the second disk comprises receiving an instruction to record the content and the encrypted title key on the second disc, the encrypted stored in the one group together with the content and the encrypted title key in correspondence with the command. Extracting a first disk key, extracting the encrypted second disk key from the second disk, and determining whether the encrypted first disk key and the encrypted second disk key are the same; It is characterized by. In addition, if the encrypted first disk key is not the same as the encrypted second disk key, a screen indicating that the content and the encrypted title key cannot be recorded on the second disk is generated and output. Characterized in that it further comprises the step.

According to another aspect of the present invention, there is provided a content providing method performed by a server communicating with a recording apparatus through a communication network, the method comprising: receiving a first disk key of a first disk from the recording apparatus, wherein a title key for the content is received; Generating an encrypted title key by encrypting with the first disk key, transmitting the encrypted title key to the recording device, and decrypting the encrypted title key with the second disk key of a second disk from the recording device. Receiving a value, determining whether the decrypted value received from the recording device is the same as a title key for the content, and notifying the recording device of the result of the determination. A provision method can be provided.

According to still another aspect of the present invention, there is provided a content recording apparatus for communicating with a server through a communication network, comprising: a communication unit for transmitting and receiving information with the server via the communication network, and a first disk key from a first disk loaded in the recording apparatus. A disc key decryption unit for extracting a key, controlling the recording device to transmit the extracted first disc key to the server, and encrypting a title key for the content with the first disc key from the server Receive the title key, and determine whether the second disc currently loaded in the recording apparatus is the same as the first disc, and if the second disc is the same as the first disc, the content and the encrypted title key And a control unit to record the content on the second disc, and the content and the encrypted title key. And a recording unit for recording on the second disk.

According to another aspect of the present invention, a server for communicating with a recording device through a communication network, comprising: a transceiver for transmitting and receiving information to and from the recording device through the communication network, and a first disk of a first disk received from the recording device. An encrypted title key generation unit for generating an encrypted title key by encrypting the title key for the content with a key, and using a value obtained by decrypting the encrypted title key with a second disc key of a second disc received from the recording apparatus; A title key comparison unit for determining whether the decrypted value is the same as the title key for the content and the server to generate the encrypted title key, and wherein the decrypted value is the title for the content. Control to determine whether the key is the same and to notify the recording apparatus of the result of the determination By including it is possible to provide a server according to claim.

According to another aspect of the invention, the step of transmitting to the server a first disk key of a first disk loaded in a recording device, generated by encrypting a title key for content with the first disk key from the server Receiving an encrypted title key and recording the content and the encrypted title key on the second disk if the second disk currently loaded in the recording device is the same as the first disk. A computer readable recording medium having stored thereon a program for executing the recording method can be provided.

According to another aspect of the invention, receiving a first disk key of a first disk from a recording device, encrypting the title key for the content with the first disk key to generate an encrypted title key, the encryption Transmitting the decoded title key to the recording device, receiving a decrypted value of the encrypted title key from the recording device with a second disk key of a second disk, and receiving the decrypted value received from the recording device. Providing a computer-readable recording medium having stored thereon a program for executing the content providing method, comprising the step of determining whether the title key is identical to the content and notifying the recording apparatus of the determination result. can do.

According to the present invention, it is possible to provide a content recording method and apparatus capable of recording content only on a specific disc, thereby preventing unnecessary disc waste.

In addition, according to the present invention, it is possible to provide a content providing method that enables content to be recorded only on a specific disk, thereby preventing unnecessary disk waste, and a server performing such a method.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 is an internal block diagram of a content recording apparatus according to an embodiment of the present invention. Referring to FIG. 3, the content recording apparatus 300 according to an exemplary embodiment of the present invention may include a user interface 310, a controller 320, a communication unit 330, a local storage 340, a recording unit 350, and a recording medium. 360, a disk key decryption unit 370, and a title key decryption unit 380. In some cases, the recording apparatus 300 may include a reading unit (not shown) that reads data from the inserted recording medium 360 or the local storage 340, and an output unit (not shown) that processes and outputs the read data. ) May be further included.

The recording device 300 is coupled to the server 301 via the communication network 210. The recording device 300 is a device capable of recording content received from the server 301 on a recording medium, and includes a digital TV, a computer, a DVD player, and the like. In the present invention, the recording device 300 may perform a reproducing function for reproducing the content recorded on the recording medium. However, the present invention is not limited thereto, and the recording device 300 does not perform the reproducing function. You can only do it. The communication network 210 includes a wired or wireless communication network.

The server 301 is operated by a content provider such as a broadcasting station, a movie production company, or a general content generating company. The server 301 stores audio signals, video signals, text signals, or metadata signals thereof. . In the present invention, the title is used in the same concept as the content. In the present invention, the content includes an audio signal, a video signal, a text signal and metadata signals thereof, so that the title also does not mean only a video signal in the present invention, but includes an audio signal, a text signal, and a metadata signal thereof. Used in a broad sense. The server 301 scrambles various titles using at least one title key to store titles in scrambled form. The server 301 also stores a title key for decrypting the scrambled title. In FIG. 3, the server 301 performs a function of providing content. However, in some cases, a database (not shown) may perform the same function as the server 301.

The user may access the server 301 to perform a login or the like, select a desired content, and download the desired content. When the use of the content is paid, the user may transmit payment information or the like to the server 301 to download the content or the like from the server 301 after the payment is completed.

The user loads a recording medium 360 such as a disc, on which the content is to be recorded, into the recording apparatus 300. The recording apparatus 300 reads out the encrypted disk key from the lead-in area of the loaded disk. The recording device 300 decrypts the disk key encrypted with the player key unique to the recording device, extracts the disk key, and transmits the extracted disk key to the server 301 through the communication network 210. The server 301 encrypts the title key for the content to be recorded by the user by using the disc key received from the recording device 300 and transmits the encrypted title key to the recording device 300. Hereinafter, the disc key used by the server 301 to encrypt the title key of the content selected by the user as the disc key transmitted by the recording device 300 to the server 301 is called a first disc key. A disc from which one disc key is extracted is called a first disc.

The recording device 300 downloads and stores the title key encrypted with the first disk key and the encrypted (scrambled) content to the local storage 340 or the like. Encrypted content may be downloaded with the encrypted title key but may be downloaded separately from the encrypted title key.

Subsequently, when the recording device 300 is instructed to record the encrypted title key and the encrypted contents on the disc currently loaded in the recording device 300, the recording device 300 determines whether the currently loaded disc is the same as the first disc. . A disc currently loaded in the recording device 300, and is referred to as a second disc to distinguish the disc from the first disc in which the user is instructed to record the encrypted content and the encrypted title key stored in the local storage. The recording apparatus 300 determines whether the second disc currently loaded is the same as the first disc, and records the content and the encrypted title key on the disc only when the two discs are the same. If the disc currently loaded is not the first disc, the recording device 300 generates and outputs a screen indicating that content and an encrypted title key cannot be recorded on the disc currently loaded.

A method of determining whether the disc currently loaded in the recording device 300 is the first disc will be described with reference to internal components of the recording device 300. The user interface 310 is responsible for an interface with a user, and transmits a user's command to the controller 320. The user interface 310 includes a physical trasducer such as a keyboard mouse, a touch screen or a microphone, and receives commands, letters, numbers, or voice information from the user and informs the controller 320 of the command.

The communication unit 330 transmits and receives information by combining to a server 301 or a database using a wired or wireless communication network 210. When the communicator 330 performs a wireless communication technology, the communicator 330 may include a radio signal transceiver (not shown), a baseband processor (not shown), and a link controller (not shown). The baseband processor and the link controller are connected to the controller 320 by a host control interface (HCI) to transmit and receive HCI packets to send and receive control commands and data. As a wireless communication method, WLAN, Bluetooth, ZigBee, WiBro technology, or the like may be used.

The local storage 340 stores information downloaded by the communication unit 330 from the server 301 or a database. In the present invention, the local storage 340 downloads and stores the encrypted title key generated by encrypting the encrypted content and the title key for decrypting the content with the first disk key from the server 301. As described above, the first disk key is a disk key transmitted by the recording device 300 to the server 301, and is used by the server 301 to encrypt a title key for predetermined content.

The recorder 350 records the encrypted title key and the encrypted content stored in the local storage 340 on the recording medium 360 currently loaded in the recording device 300.

The disk key decryption unit 370 extracts the encrypted disk key from the recording medium 360 loaded in the recording device 300. The disk key decryption unit 370 extracts the encrypted first disk key from the first disk when the first disk is loaded in the recording device 300, and encrypts the first disk encrypted with the player key unique to the recording device 300. Decrypt the key to extract the first disk key. The disk key decryption unit 370 transmits the extracted first disk key to the server 301 through the communication unit 330. Then, when the second disk is loaded in the recording device 300, the disk key decryption unit 370 extracts the encrypted second disk key from the second disk, decrypts the encrypted second disk key with the player key, and 2 Extract the disk key. The disc key decryption unit 370 sends the extracted second disc key to the title key decryption unit 380.

When the title key decryption unit 380 instructs the user to record the content on the disc currently loaded, the disc key decryption unit 370 is loaded on the recording apparatus 300, that is, the first recording medium. The encrypted title key stored in the local storage 340 is decrypted using the second disk key extracted from the two disks. Since the encrypted title key stored in the local storage 340 is encrypted with the first disk key, the first disk and the second disk are the same. When the first disk key and the second disk key are the same, the decrypted value is the content. It is the same as the title key of. However, if the second disk key and the second disk key are not the same because the first disk and the second disk are not the same, the value decrypted by the title key decryption unit 380 is different from the title key of the content. do. The title key decryption unit 380 transmits the decrypted value to the server 301 through the communication unit 330.

The controller 320 controls the overall operation of the recording apparatus 300 so that the content recording method according to the present invention is performed. The controller 320 includes an Arithmetic Logic Unit (ALU) for performing calculations and a register for temporarily storing data and instructions. The controller 320 controls the disk key decryption unit 370 to extract the first disk key from the recording medium 360 loaded in the recording device 300. The control unit 320 transmits the first disk key to the server 301 through the communication unit 330, and downloads a title key for the content encrypted with the first disk key from the server 301. The controller 320 stores the downloaded encrypted title key and the encrypted content in the local storage 340.

Subsequently, when the user is instructed to record the content and the encrypted title key stored in the local storage 340 on the disc currently loaded in the recording apparatus 300 through the user interface 310, the control unit 320. Determines whether the second disk currently loaded in the recording device 300 is the same as the first disk. In order to determine whether the second disk is the same as the first disk, the controller 320 controls the disk key decryption unit 370 to extract the second disk key from the second disk, and then executes the title key decryption unit 380. By controlling, the decrypted value is obtained by decrypting the encrypted title key stored in the local storage 340 using the second disk key. The controller 320 transmits the decrypted value to the server 301 together with the content identifier for identifying the content. The server 301 retrieves the identified content by using the content identifier, and extracts a title key unique to the content assigned to the identified content. The server 301 determines whether the value obtained from the recording device 300 and decrypted the title key encrypted with the first disk key with the second disk key is the same as the title key of the content identified by the content identifier, and records the result. Notifies the device 300. The control unit 320 determines that the second disc is the same as the first disc when notified from the server 301 that the value of decrypting the title key encrypted with the first disc key with the second disc key is the same as the title key for the content. The recorder 350 records the encrypted content and the encrypted title key stored in the local storage 340 on the second disk. If the controller 320 is notified by the server 301 that the value of decrypting the title key encrypted with the first disk key with the second disk key is not the same as the title key for the content, the control unit 320 outputs the content and the encrypted title to the second disk. Create a screen that indicates that the key cannot be recorded and print it out.

The reading unit reads data from the local storage 340 or the recording medium 360, and sends the read data to the output unit. The output unit transforms the read-out data into a format that can decode and output the read data, and outputs the modified signal. In addition, the output unit outputs the overall state of the recording device 300 or information input by the user through the user interface 310 through a screen or a speaker. The output unit includes a display unit (not shown) for outputting a video signal, a speaker (not shown) for outputting an audio signal, and the like. The output unit may include an OSD processor which generates a user control list and the like and outputs the same. The output unit records the content and the encrypted title key on the second disk when the user wants to write the encrypted title key and the encrypted content stored in the local storage 340 to a second disk that is not the same as the first disk. Create a screen that says it can't and print it.

4 is an internal block diagram of a content recording apparatus according to another embodiment of the present invention. Referring to FIG. 4, the content recording apparatus 400 according to another embodiment of the present invention may include a user interface 410, a control unit 420, a communication unit 430, a local storage 440, a recording unit 450, and a recording medium. 460, a disk key decryption unit 470, and a disk comparison unit 480. In some cases, the recording apparatus 400 may include a readout unit (not shown) that reads data from the inserted recording medium 460 and an output unit that processes and outputs the data read out from the recording medium 460 (not shown). May further include). As shown in FIGS. 2 and 3, the recording apparatus 400 of FIG. 4 is coupled to the server 401 through the communication network 210.

The user interface 410, the communication unit 430, the recording unit 450, the recording medium 460, and the disc key decryption unit 470 of the recording apparatus 400 of FIG. 4 are the user interface of the recording apparatus 300 of FIG. 3. (310), the communication unit 330, the recording unit 350, the recording medium 360 and the disk key decryption unit 370 has the same function and described with respect to these components described with reference to FIG. The description will be omitted.

Referring to FIG. 4, the local storage 440 downloads encrypted title keys and encrypted contents from the server 401 or a database and stores them. In FIG. 4, the local storage 440 stores the encrypted title key and the encrypted content in a group together with the encrypted first disk key. Each group stored in the local storage 440 is managed using a content identifier. That is, the local storage 440 manages a group by assigning a content identifier for identifying encrypted content included in each group as an identifier of each group.

The disk comparator 480 may encrypt the encrypted second disk key extracted from the second disk loaded by the disk key extractor 470 in the current recording device 400 in the local storage 440. It compares with the key to determine whether the two values are the same and informs the controller 420 of the result.

The controller 420 controls the overall operation of the recording apparatus 400 to perform the content recording method according to the present invention. The controller 420 controls the disk key decryption unit 470 to extract the encrypted first disk key and the first disk key from the first disk loaded in the recording apparatus 400. The control unit 420 transmits the first disk key to the server 401 through the communication unit 430, and downloads an encrypted title key generated by encrypting the title key for the content with the first disk key from the server 401. Receive. The controller 420 bundles the downloaded encrypted title key and the encrypted content into a group together with the encrypted first disk key and stores them in the local storage 440.

Then, the recording device 400 stores the encrypted content and the encrypted title key of a specific group stored in the local storage 440, that is, a specific group managed by the specific content identifier, from the user through the user interface 410. When a command is given to record to the second disk currently loaded, the controller 420 determines whether the second disk currently loaded in the recording apparatus 400 is the same as the first disk. To this end, the controller 420 may include the scrambled content and the title key encrypted with the first disk key before recording the scrambled content and the title key encrypted with the first disk key stored in the local storage 440 on the second disk. The second disk is extracted by extracting the encrypted first disk key stored in the local storage 440 together as a group and comparing the encrypted second disk key of the second disk currently loaded in the recording device 400. It is determined whether it is the same as the first disk. That is, the controller 420 controls the disk key decryption unit 470 to extract the encrypted second disk key from the second disk currently loaded in the recording device 400 and to extract the extracted second disk key. To the disk comparator 480. The controller 420 controls the disk comparator 480 to compare the encrypted first disk key stored in the local storage 440 with the second disk key to determine whether the two values are the same. If the encrypted first disk key and the encrypted second disk key are not the same, the controller 420 determines that the first disk and the second disk are not the same, and the recording unit 450 encrypts the encrypted content on the second disk. And controlling not to record the encrypted first title key, and controlling the output unit to output a screen indicating that the content and the encrypted title key cannot be recorded on the second disc. If the encrypted first disk key and the encrypted second disk key are the same, the controller 420 determines that the first disk and the second disk are the same, and controls the recording unit 450 to control the content encrypted on the second disk. And record the encrypted first title key.

5 is a module configuration diagram of a server performing a content providing method according to an embodiment of the present invention. Referring to FIG. 5, the server 301 may transmit / receive a transmission / reception processing module 541 for processing communication with the recording device 300 of FIG. 3 and a title for a title desired by the user using the first disk key transmitted by the user. An encrypted title key generation module 543 for encrypting the key to generate an encrypted title key, and a value obtained by decrypting the title key encrypted with the second disk key received from the recording device 300 includes a title key for the content; A title key comparison module 545 that determines whether they are the same.

Looking at the overall configuration of the server 301 through such an application module as follows. The server 301 may use various operating systems (OS) as the OS of the system. The OS provides a high level command to an application program interface (501) to control the operation of each application module 540. The server 301 includes a high level command processor 510 for identifying each application module 540 corresponding to the high level command provided from the API 501, and decoding the high level command and providing the decoded high level command to a corresponding place. do. The application module controller 520 controls the operation of the application module 540 according to the command provided from the high level command processor 510. That is, the high level command processing unit 510 identifies whether there is an application module 540 corresponding to the high level command provided through the API 510, and if the corresponding application module 540 exists, The decoded command is recognized by the application module 540 and transmitted to the corresponding mapping unit or the message transmission is controlled. Accordingly, the application module controller 520 may be a mapping unit 521, 525, and 529 and an interface unit 523 for the transmission / reception processing module 541, the encrypted title key generation module 543, and the title key comparison module 545. , 527, and 531, respectively.

The transmission / reception processing module mapping unit 521 receives a high-level command for performing communication with the recording device 300 from the high-level command processing unit 510 to a device level that can be processed by the transmission / reception processing module 541. Mapping is provided to the transmission and reception processing module 541 via the transmission and reception processing module interface unit 523.

The encrypted title key generation module mapping unit 525 and the encrypted title key generation module interface unit 527 retrieve the content requested by the user, extract the title key of the content requested by the user, and receive it from the recording device 300. The title key is encrypted with one first disk key to generate an encrypted title key. The encrypted title key generation module mapping unit 525 receives a high level command for using the encrypted title key generation module 543 from the high level command processing unit 510 and maps it to a device level command. The title key generation module 527 is provided to the encrypted title key generation module 543.

The title key comparison module mapping unit 529 and the title key comparison module interface unit 531 receive and receive from the recording device 300 a value obtained by decrypting the title key encrypted with the first disk key with the second disk key together with the content identifier. The determined value is compared with the title key of the identified content using the content identifier to determine whether the two values are the same. To this end, the title key comparison module mapping unit 529 receives a high level command applied through the high level command processing unit 510 and maps it to a device level command that can be recognized by the title key comparison module 545. The device level command is provided to the title key comparison module 545 through the title key comparison module interface 531.

FIG. 6 is a flowchart illustrating a content recording method performed by the recording apparatus of FIG. 3. Referring to FIG. 6, the recording device 300 extracts an encrypted first disk key from a first disk loaded in the recording device 300, and converts the encrypted first disk key into a player key unique to the recording device 300. Decrypt and extract the first disk key. The recording device 300 transmits the extracted first disk key to the server 301 through the communication unit 330 (step 601). The user may access the server 301, select content to be recorded on the recording medium 360, and download the content. The server 301 encrypts the content selected by the user with the first disk key to generate an encrypted title key. The recording device 300 receives from the server 301 the title key encrypted with the first disk key (step 603). The recording device 300 stores the title key encrypted with the first disk key together with the encrypted content (step 605). When the recording device 300 is instructed by the user to record the title key encrypted with the first disk key and the encrypted content on the second disk currently loaded (step 607), the recording apparatus 300 extracts the second disk key from the second disk. The title key encrypted with the first disk key is decrypted using the extracted second disk key (step 609). The recording device 300 transmits the decrypted value to the server 301 (step 611). The server 301 compares the value received from the recording device 300 with the title key of the content and notifies the recording device whether the two values are the same. The recording device 300 is informed by the server 301 whether the decrypted value is the same as the title key (step 613), and when notified that the two values are the same, the recording device 300 matches the encrypted content with the encrypted content of the first disk key. The second disc is recorded together (step 615). If the recording device 300 is notified that the two values are not the same, the recording device 300 blocks the recording of the title key encrypted with the first disk key and the encrypted content on the second disk, and the encrypted title key and encrypted on the second disk. A screen indicating that the content cannot be recorded is generated and output (step 617).

7 is a flowchart illustrating a content recording method performed by the recording apparatus of FIG. 4. Referring to Fig. 7, the recording device 400 extracts an encrypted first disk key from the first disk currently loaded in the recording device 400 (step 701). The recording device 400 decrypts the encrypted first disk key with a player key, extracts the first disk key, and transmits it to the server 401 (step 703). The server 401 generates the encrypted title key by encrypting the title key of the content desired by the user with the first disk key and transmits the encrypted title key to the recording apparatus 400. The recording device 400 receives a title key encrypted with the first disk key from the server 401 (step 705). The recording device 400 stores the encrypted title key together with the encrypted content and the encrypted first disk key as one group identified by the content identifier (step 707). When the recording device 400 is instructed by the user to record the encrypted title key and the encrypted content of the group identified by the specific content identifier on the second disk (step 709), the recording device 400 is currently loaded in the recording device 400. The encrypted second disk key is extracted from the second disk (step 711). The recording device 400 searches for a group identified by a specific content identifier in the local storage 440 and extracts an encrypted first disk key included in the group. The recording device 400 determines whether the extracted first disk key is the same as the second disk key (step 713). If the two values are the same, the recording device 400 determines that the first disc and the second disc are the same, and records the encrypted title key and the encrypted content on the second disc (step 715). If the two values are not the same, the recording device 400 blocks the recording of the encrypted title key and the encrypted content on the second disk, and the recording device 400 cannot record the encrypted title key and the encrypted content on the second disk. A screen to be displayed is generated and output (step 717).

FIG. 8 is a flowchart illustrating a content providing method performed by the server 301 of FIG. 3. Referring to Fig. 8, server 301 receives a first disk key from recording device 300 (step 801). As described above, the server 301 stores various contents scrambled with a title key, and stores a title key for decoding the scrambled contents. The user can select the desired content in the server 301. The server 301 retrieves the content desired by the user and extracts the title key of the content selected by the user. The server 301 encrypts the extracted title key with the first disk key to generate an encrypted title key (step 803) and transmits it to the recording apparatus 300 (step 805). Thereafter, the server 301 receives, from the recording apparatus 300, the value obtained by decrypting the title key encrypted with the first disk key with the second disk key together with the content identifier (step 807). The server 301 searches for the identified content by using the received content identifier and extracts the title key of the corresponding content. The server 301 compares the extracted title key with the decrypted value received from the recording device 300 to determine whether the two values are the same (step 809). The server 301 notifies the recording apparatus 300 whether the two values are the same (step 811).

The content providing or recording method as described above can also be embodied as computer readable codes on a computer readable recording medium. The computer-readable recording medium includes all kinds of recording devices in which data that can be read by a computer system is stored. Examples of computer-readable recording media include ROM, RAM, CD-ROM, magnetic tape, floppy disks, optical data storage devices, and the like. The computer readable recording medium can also be distributed over network coupled computer systems so that the computer readable code is stored and executed in a distributed fashion. In addition, functional programs, codes, and code segments for implementing the recording / reproducing method can be easily inferred by programmers in the art to which the present invention belongs.

So far I looked at the center of the preferred embodiment for the present invention. Those skilled in the art will appreciate that the present invention can be implemented in a modified form without departing from the essential features of the present invention. Therefore, the disclosed embodiments should be considered in descriptive sense only and not for purposes of limitation. The scope of the present invention is shown in the claims rather than the foregoing description, and all differences within the scope will be construed as being included in the present invention.

1 is a diagram for explaining a recording apparatus writes content to a disc using CSS technology.

2 is a diagram showing a content recording system for explaining the present invention.

3 is an internal block diagram of a content recording apparatus according to an embodiment of the present invention.

4 is an internal block diagram of a content recording apparatus according to another embodiment of the present invention.

5 is a module configuration diagram of a server performing a content providing method according to an embodiment of the present invention.

FIG. 6 is a flowchart illustrating a content recording method performed by the recording apparatus of FIG. 3.

7 is a flowchart illustrating a content recording method performed by the recording apparatus of FIG. 4.

FIG. 8 is a flowchart illustrating a content providing method performed by the server 301 of FIG. 3.

<Explanation of symbols for the main parts of the drawings>

300, 400: recording device 301, 401: server

210: communication network 380: title key decryption unit

480: disk comparator

Claims (22)

A content recording method performed by a recording apparatus communicating with a server via a communication network, Transmitting a first disk key of a first disk loaded in the recording apparatus to the server; Receiving, from the server, an encrypted title key generated by encrypting a title key for content with the first disk key; Determining whether a second disk key of a second disk currently loaded in the recording apparatus is the same as the first disk key; And And recording the content and the encrypted title key on the second disc when the second disc key is the same as the first disc key. The method of claim 1, wherein determining whether the second disk key is the same as the first disk key Decrypting the encrypted title key with the second disc key; Transmitting the decrypted value to the server with a content identifier identifying the content; And And notifying from the server as to whether the decrypted value is equal to the title key of the content identified by the content identifier. The method of claim 2, further comprising: obtaining the first disk key by decrypting the encrypted first disk key recorded on the first disk with a player key of the recording apparatus; And And decrypting the encrypted second disk key recorded on the second disk with the player key of the recording device to obtain the second disk key. The method of claim 2, wherein the recording of the content and the encrypted title key on the second disc includes: And determining that the second disc is the same as the first disc when notified from the server that the decrypted value is the same as the title key for the content. 5. The method of claim 4, wherein when the server has been notified that the decrypted value is not the same as the title key for the content, it indicates that the content and the encrypted title key cannot be recorded on the second disc. And generating a screen and outputting the screen. The method of claim 1, wherein determining whether the second disk key is the same as the first disk key And determining whether the encrypted second disk key extracted from the second disk and the encrypted first disk key extracted from the first disk are the same. The method of claim 6, Storing the encrypted title key received from the server together with the content and the encrypted first disk key in a group; Recording the content and the encrypted title key on the second disc Receiving a command to record the content and the encrypted title key on the second disc; Extracting the encrypted first disk key stored in the one group together with the content and the encrypted title key in response to the command; Extracting the encrypted second disk key from the second disk; And And determining whether the encrypted first disk key and the encrypted second disk key are the same. 8. The screen of claim 7, wherein when the encrypted first disk key is not the same as the encrypted second disk key, a screen indicating that the content and the encrypted title key cannot be recorded on the second disk. Generating and outputting the same. A content providing method performed by a server communicating with a recording device through a communication network, Receiving a first disk key of a first disk from the recording device; Encrypting a title key for the content with the first disk key to generate an encrypted title key; Transmitting the encrypted title key to the recording device; Receiving a value obtained by decrypting the encrypted title key with a second disc key of a second disc from the recording device; Determining whether the decrypted value received from the recording device is the same as a title key for the content; And And notifying the recording device of the result of the determination. 10. The method of claim 9, comprising receiving a content identifier identifying the content from the recording device, The determining step Extracting a title key for the content identified by the content identifier; And And determining whether a value obtained by decrypting the encrypted title key with the second disc key is identical to the extracted title key received from the recording apparatus. A content recording apparatus communicating with a server via a communication network, A communication unit for transmitting and receiving information with the server through the communication network; A disc key decryption unit for extracting a first disc key from a first disc loaded in the recording apparatus; Control the recording device to transmit the extracted first disk key to the server, and receive, from the server, an encrypted title key generated by encrypting a title key for the content with the first disk key, If the second disc key is the same as the first disc key by judging whether a second disc group of the second disc currently loaded in the recording apparatus is the same as the first disc key, the content and the encrypted title key are changed. A control unit for recording on the second disk; And And a recording unit for recording the content and the encrypted title key on the second disc. 12. The apparatus of claim 11, further comprising a title key decryption unit that decrypts the encrypted title key with the second disk key of the second disk. The disk key decryption unit extracts the second disk key from the second disk currently loaded in the recording apparatus; The control unit transmits the decrypted value of the title key decrypter to the server together with the content identifier identifying the content, and the title key of the content from which the decrypted value is identified by the content identifier. And be notified whether or not they are the same. The apparatus of claim 12, wherein the disk key decryption unit Extract the encrypted first disk key from the first disk, decrypt the encrypted first disk key with a player key to obtain the first disk key, extract the encrypted second disk key from the second disk, and encrypt the And deciphering the second disc key with the player key to obtain the second disc key. The contents of claim 12, wherein the controller determines that the second disc is the same as the first disc when the server is informed that the decrypted value is the same as the title key for the content. Recording device. 15. The apparatus of claim 14, further comprising an output unit for outputting content recorded on the disc. If the controller is notified by the server that the decrypted value is not the same as the title key for the content, the controller controls the output unit to record the content and the encrypted title key on the second disc. And a screen for displaying and outputting the screen. The apparatus of claim 11, wherein the disk key decryption unit extracts an encrypted second disk key from the second disk, extracts an encrypted first disk key from the first disk, And the controller determines whether the second disk is the same as the first disk by using whether the encrypted first disk key and the encrypted second disk key are the same. The method of claim 16, Local storage for storing the encrypted title key received from the server together with the contents and the encrypted first disk key in a group; And And a disk comparing unit which determines whether the encrypted first disk key is the same as the encrypted second disk key. 18. The apparatus of claim 17, further comprising an output unit for outputting content recorded on the disc. If the encrypted first disk key is not the same as the encrypted second disk key, the controller controls the output unit to indicate that the content and the encrypted title key cannot be recorded on the second disk. And a screen for generating a screen and outputting the screen. A server for communicating with a recording device via a communication network, A transceiver for transmitting and receiving information with the recording device through the communication network; An encrypted title key generation unit for generating an encrypted title key by encrypting the title key for the content with the first disc key of the first disc received from the recording apparatus; A title key comparison unit for determining whether the decrypted value is the same as the title key for the content by using a value obtained by decrypting the encrypted title key with a second disc key of a second disc received from the recording apparatus; ; And And a controller configured to control the server to generate the encrypted title key, to determine whether the decrypted value is the same as the title key for the content, and to notify the recording apparatus of the result of the determination. Server. 20. The apparatus of claim 19, wherein the title key comparison unit And extracting a title key for the content identified by the content identifier by using the content identifier received from the recording apparatus and the content identifier identifying the content received together with the decrypted value. A content recording method performed by a recording apparatus communicating with a server via a communication network, Transmitting a first disk key of a first disk loaded in the recording apparatus to the server; Receiving, from the server, an encrypted title key generated by encrypting a title key for content with the first disk key; Determining whether a second disk key of a second disk currently loaded in the recording apparatus is the same as the first disk key of the first disk; And if the second disc key is the same as the first disc key, recording the content and the encrypted title key on the second disc. Readable recording medium. A content providing method performed by a server communicating with a recording device through a communication network, Receiving a first disk key of a first disk from the recording device; Encrypting a title key for the content with the first disk key to generate an encrypted title key; Transmitting the encrypted title key to the recording device; Receiving a value obtained by decrypting the encrypted title key with a second disc key of a second disc from the recording device; Determining whether the decrypted value received from the recording device is the same as a title key for the content; And And notifying the recording apparatus of the result of the determination.

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