KR100690596B1 - Content recording apparatus and method - Google Patents

Abstract

The present invention relates to a content recording apparatus and method. In the related art, encryption is hierarchically performed by taking advantage of the characteristics of recordable discs, Even if it is desired to reproduce data for backup purposes or the like, it is impossible to reproduce data if there is a watermark in any kind, thereby limiting the use of the data for personal use. Accordingly, in order to solve the above-mentioned problems, the present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a method and a system for setting a copy permission step in a content received through various transmission channels, The user of the replication permission step can back up the data. In the case where the user is in the non-replication step, the replication can be selectively allowed, .

Description

[0001] CONTENT RECORDING APPARATUS AND METHOD [0002]

1 is a diagram showing an area by a hierarchical encryption method of a general disk;

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001]

3 is a block diagram showing a configuration of an encryption / playback apparatus of a conventional disk.

FIG. 4 is a diagram showing an area by a hierarchical encryption method of a recordable disk in FIG. 2; FIG.

5 is a block diagram showing a configuration of a content recording apparatus according to the present invention.

FIG. 6 is a flowchart schematically showing a content recording process in FIG. 5;

Description of Reference Numerals to Main Parts of the Drawings *****

100: Input interface unit 200: Replication control information verification unit

300: Content decryption unit 400: Analog copy control verification unit

500: Content-ID conversion unit 600: Content-

700: watermark remarking unit 800: content output unit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a content recording apparatus and method, and more particularly, to a content recording apparatus and method for preventing unauthorized copying by selectively recording content received through various channels according to whether the content is authenticated.

With the advent of the digital age, various works such as movies and music are being sold in the form of digital contents. The characteristic of such digital contents is that duplicates are not different from the original, and duplication and distribution are easy.

In particular, in recent years, unauthorized copying and reproduction have become more serious as a mass storage medium and a super high-speed transmission medium have developed. Such prior art will be described with reference to the accompanying drawings.

1 is a cross-sectional view showing a structure of a ROM disc to which a conventional CSS (Content Scramble System) copy protection system is applied. As shown in FIG. 1, a lead-in area including a disc key block and an encrypted title key, And a recordable user data area. The disc key is encrypted using the device key, the title key is encrypted with the disc key, the content is encrypted with the title key, and the decryption is performed in the reverse order.

At this time, the disk key, the title key, and the content can be easily copied through a bit by bit copy or a general copy (casual copy), and a method of confirming the type of disk (ROM type, RAM type) It was impossible to confirm whether or not it was copied when it was copied to a recordable disk.

Accordingly, the above-described problem has been solved by an apparatus as shown in FIG. 2 in the related art.

That is, FIG. 2 is a block diagram showing a configuration of an encryption recording apparatus of a conventional recordable disk. As shown in FIG. 2, the author input unit 10 for inputting author input information; A media key generation unit (11) for encrypting and outputting a media key according to the manufacturer input information of the producer input unit (10); A media ID generation unit (12) for generating a media ID; A title key encryption unit 13 for receiving the author input information and encrypting and outputting the title key; A content encryption unit (14) for receiving the original content and encrypting it with the title key and outputting the encrypted content; And a content recording unit 15 for receiving the encrypted content from the content encryption unit 14 and recording it on a disk.

Therefore, in order to reproduce the disc produced as described above, the manufacturer information used for the encryption is detected from the disc to generate the same title key used for the encryption, thereby allowing the content to be decrypted, The disc was not reproduced by itself.

FIG. 3 is a block diagram showing a configuration of a conventional recordable disc reproducing apparatus. As shown in FIG. 3, the content encrypting / non-verifying unit 19 receives content recorded on a disc and determines whether the content is encrypted or not. A reader (16) for reading the author input information recorded on the disc and outputting the title key generation information according to the read author input information; A title key generation unit 17 for receiving the title key generation information of the reader 16 and generating a title key corresponding to the title key generation information; A content decryption unit 18 for receiving the encrypted content from the content encryption / decryption unit 19 and decrypting the encrypted content using the title key; A watermark identification unit (20) for receiving an original content from the content decryption unit (18) or the content encryption / decryption identification unit (19) and discriminating the presence / absence of a watermark; And a playback / non-playback determining unit 21 for determining whether the content is played back based on the watermark information presence / absence determination signal of the watermark identification unit 20 and outputting a playback / stop signal corresponding thereto. The operation and operation of the playback apparatus will be described.

First, at the time of recording, the user generates and outputs producer input information through the producer input unit 10. Then, the media key generating unit 11 encrypts and outputs the media key using the device key of the producer input information.

At this time, the manufacturer input information includes at least one of a stamp ID, media type information, and a device key.

At this time, the media ID generation unit 12 generates a media ID and outputs it to the title key encryption unit 13. Then, the title key encryption unit 13 encrypts the media ID, the media key, the recorder ID, And encrypts and outputs the title key accordingly.

Then, the content encryption unit 14 receives the original content to be recorded, encrypts it with the title key of the title key encryption unit 13, and outputs the encrypted content. Then, the content recording unit 15 encrypts the encrypted content, .

Here, since the content without watermark is content permitted to be copied indefinitely, the content is recorded without performing encryption, and the content with watermark is encrypted and recorded because it is a content with conditions and restrictions for copying.

4, the media key block and the media ID are recorded in a non-recordable lead-in area of the recordable disc, and the recordable lead-in area is recorded with the title key encrypted with the media key, Media type, and the like, and the content encrypted with the title key is recorded in the user data area so that encryption can be performed according to each layer of the recordable disk.

That is, the device key encrypts the media key, the media key encrypts the title key, and the title key encrypts the content and records the encrypted content on the disc. The decryption is performed in the reverse order.

Here, since the title key is generated through the media key, the media ID, and the media type, the content stored in the specific disc can not be decoded on the disc having the different media ID, and the media type includes the physical characteristics. (For example, the type of a disc produced by a professional producer is a ROM type, and the type of a disc used for the reproduction is a RAM type). When a title is reproduced, The key can not be generated.

The process of reproduction will be described in more detail as follows.

The playback apparatus reads the media type, media ID, media key, and device key recorded on the disk through the reader 16 and outputs the title key generation information according to the read media type, media ID, media key, and device key, Receives the title key generation information of the reader 16, and outputs the title key corresponding thereto.

At this time, the content encryption / decrypter identification unit 19 receives the content recorded on the disk and determines whether or not the content is encrypted. If the content is encrypted, the content decryption unit 18 decrypts the encrypted content And decodes it by the title key of the title key generating unit 17 and outputs it to the watermark identifying unit 20.

Then, the watermark identification unit 20 receives the original content, identifies whether the watermark exists in the content, and outputs the watermark information to the playback determination unit 21.

Accordingly, the reproduction-playback determining unit 21 determines whether or not the content is to be played back based on the watermark information of the watermark-identifying unit 20 and outputs a playback / stop signal corresponding thereto, that is, If there is no mark, or if the content is encrypted and the watermarked content is watermarked, the watermarked content is regarded as illegal and the playback is stopped.

That is, the media type is identified from the physical characteristics of the disc (for example, a wobble is made to facilitate recording on the recordable disc). The media ID and the media key block are read from the unreadable lead- , It is confirmed that the given disc from the media type is a recordable disc.

At this time, the recordable disk has a unique media key, which is generated in a factory-level stamper step of producing the media. By bit copying or general copying, the data in the area is not copied Therefore, information to be input for generating a title key at the time of reproduction becomes different, and reproduction becomes impossible.

Thereafter, it is checked whether or not the content on the recordable disk is encrypted. If the content is not encrypted and there is no watermark, the content is regarded as unlimited copyable content and played back. If the content is not encrypted, The content is regarded as illegal copy and playback is stopped.

That is, in order to prevent unauthorized copying of the watermark, the content is inserted together with the watermark. However, when the encrypted content is decrypted and copied, the content is not encrypted. However, It will be regarded as illegal copy.

If the content is encrypted, the title key is obtained using the media type, the media ID, and the media key block, the content is decrypted with the title key, and the content is reproduced even if the decrypted content has a non-copyable watermark.

 In this way, conventionally, by making use of the characteristics of the recordable disk and performing encryption in a hierarchical manner, it is possible to prevent illegal copying by making it impossible to reproduce when duplication is performed. However, There is a problem that the use range of the recording apparatus is reduced because the use of the watermark is irrelevant for the personal use by making the reproduction impossible.

Accordingly, the present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a method and apparatus for selectively copying content permitted to be copied once or freely according to a watermark or copy control information, It is possible to prevent unauthorized copying other than the personal use from being recorded in the recording step and prevent duplication of the content through the other transfer channel as well as copying the content, And an object of the present invention is to provide a recording apparatus and method.

According to an aspect of the present invention, there is provided a digital broadcasting receiver comprising: a control unit for dividing and controlling whether content input through various transmission channels is authenticated digital content; A duplication control information verifying unit for determining whether duplication is possible if the content is authenticated digital content; A content decryption unit for decrypting the digital content when the authenticated digital content is a copyable content; A content output unit for outputting the decrypted digital content and the digital content not subjected to the authentication so that the content can be recorded when the content is allowed to be copied in the content watermark information; And a watermark updating unit for updating the content watermark information when the recording is performed.
According to another aspect of the present invention, there is provided a method of transmitting digital content, the method comprising: determining whether content input through various transport channels is authenticated digital content or unauthenticated digital content; Determining whether the content that has been authenticated in the step is reproducible through the copy control information; And performing recording after performing the decoding of the authenticated digital content when the copy control information indicates that it is replicable, and performing recording after processing the unauthorized content without performing a separate decoding operation .

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Hereinafter, operations and effects of the content recording / reproducing apparatus and method of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 5 is a block diagram illustrating a configuration of a content recording apparatus according to an embodiment of the present invention. As shown in FIG. 5, when digital content is authenticated according to the type of content received through the input interface unit 100 according to a transmission channel, A duplication control information verifying unit 200 for verifying information; A content decoding unit (300) for decoding the content if the copy control information is permitted to be copied; An analog copy control verification unit 400 for checking whether a copy protection signal is added when the content input through the input interface unit is analog content; A content-ID converting unit 500 for performing analog-to-digital conversion on an analog content to which a copy protection signal is not added; The digital content that has not been authenticated through the input interface unit 100 or the content decrypted through the content decryption unit 300 or the content that has been subjected to the A / D conversion through the content-A / D conversion unit 500 receives the watermark information A content watermark verifying unit 600 for verifying the content watermark; A watermark remarking unit 700 for remarking and outputting the copy permission information of the content watermark; And a content output unit 800 for outputting the content permitted to be infinitely reproduced as a result of the watermark check or the content for which the watermark is remarked as a result of the watermark check. In the flowchart of FIG. 6, Reference will now be made to the following.

First, the input interface unit 100 receives various types of content through various transmission channels (for example, the Internet, USB, IEEE 1394, etc.), and controls so that it can pass through appropriate processing steps depending on whether the content is authenticated .

Accordingly, if the content is digital content that has been authenticated, it is input to the duplication control information verification unit 200 to determine whether duplication is allowed or not. If duplication is impossible, a recording operation is performed .

However, if the content is permitted to be copied, the content decryption unit 300 generates the title key through the same process as that of the encrypted content, thereby decrypting the content.

On the other hand, when the content inputted through the input interface unit 100 is analog content such as audio or video, it is checked whether copy protection is enabled through the analog copy control confirmation unit 400, The recording operation is not performed.

However, if copy protection is not provided, analog to digital conversion is performed through the content-ID conversion unit 500, and the converted digital watermark is output to the content watermark verification unit 600.

At this time, the content watermark verifying unit 600 receives the digital content that has not been authenticated through the input interface unit 100 or receives the decrypted content through the content decrypting unit 30, Mark is detected and the recording operation is not performed when copying is impossible or when copying is not possible, and when the copying is within the copying permission step, the permission step is reduced and remarked through the watermark remarking unit 700.

Accordingly, the content output unit 800 inputs the content that is allowed to be infinitely reproduced, that is, the content which can be freely reproduced, or the content remarking the copying step through the watermark remarking unit 700 through the content watermark checking unit 600 So that the recording operation can be performed.

As described in detail above, according to the present invention, it is possible to set and record the copy permission step on the content received through various transmission channels, or to copy the content permitted by the watermark or the copy control information by the permitted step The user of the replication permission step can back up the data. If the user is in a step that is not in the replication permission step, the reproduction can be prevented in advance as well as the replication itself, thereby allowing selective replication, .

Claims (8)

A controller for discriminating whether the content input through the various transport channels is authenticated digital content or not; A duplication control information verifying unit for determining whether duplication is possible if the content is authenticated digital content; A content decryption unit for decrypting the digital content when the authenticated digital content is a copyable content; A content output unit for outputting the decrypted digital content and the digital content not subjected to the authentication so that the content can be recorded when the content is allowed to be copied in the content watermark information; And And a watermark updating unit for updating the content watermark information when the recording is performed. The apparatus of claim 1, wherein the control unit Further comprising: an analog copy control checking unit for checking whether the content is analog content and checking whether a copy protection signal is added when the content is analog content; Further comprising a digital converting unit for performing digital conversion on analog content to which the copy protection signal is not added as a result of the checking. The method of claim 1, Wherein the input unit receives input through a transmission channel of the Internet, USB, or IEEE 1394, and determines whether or not the content is input through another channel. Determining whether the content input through the various transport channels is authenticated digital content or unauthenticated digital content; Determining whether the content that has been authenticated in the step is reproducible through the copy control information; And performing recording after performing the decoding of the authenticated digital content when the copy control information indicates that it is replicable, and performing recording after processing the unauthorized content without performing a separate decoding operation . 5. The method of claim 4, Wherein in the case of the authenticated digital content, the execution of the recording operation is stopped when the confirmed copy control information is not copyable, and the content is decrypted when the copied copy control is permitted. 5. The method of claim 4, It is further checked whether the content is analog content and whether or not copy protection is performed when the content is analog content. If the content is not analog content, the recording operation is stopped. If copy protection is not performed And converting the digital data into digital data before recording. 5. The method of claim 4, A content watermark is checked before the recording is performed, and whether or not the content is recordable is confirmed after confirming whether or not the content can be copied. 8. The method of claim 7, And when the recording is permitted, updating the content watermark and recording the content watermark.

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