KR100556731B1 - Encryption recording/playing apparatus and method for disk - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and method for encrypting / reproducing a disc. In the related art, as a mass storage medium and a high-speed transmission medium are developed, there is a problem in that data is copied or reproduced without permission. Accordingly, the present invention provides a producer input unit for inputting producer input information; A media key generation unit for encrypting and outputting a media key according to producer input information inputted to the producer input unit; A media ID generator for generating a media ID; A title key encryption unit which receives the producer input information and encrypts and outputs a title key; A content encryption unit which receives the original content and encrypts it by the title key and outputs the encrypted content; It comprises a content recording unit that receives the encrypted content from the content encryption unit and writes it to a disc, thereby encrypting the content and data on the ROM disc, thereby preventing unauthorized reproduction, and also allowing different media IDs for each ROM disc. With the title key, unauthorized copying can be made impossible to play. Also, information related to the duplication of encrypted content recorded on the ROM disk can be checked and allowed to be played back and stopped. Also, unauthorized copying can be prevented. This has the effect of suppressing unauthorized copying of digital content.

Description

ENCRYPTION RECORDING / PLAYING APPARATUS AND METHOD FOR DISK}

Fig. 1 shows an area by a hierarchical encryption method of a general disc.

Fig. 2 is a block diagram showing the construction of the encryption recording apparatus of the disc of the present invention.

Fig. 3 is a block diagram showing the construction of the encryption / playback apparatus of the disc of the present invention.

4 is an operational flowchart of the encryption recording method of the disc of the present invention.

Fig. 5 is an operational flowchart of the encryption / playback method of the disc of the present invention.

Fig. 6 is a diagram showing the area by the hierarchical encryption method of the disc in Fig. 2;

FIG. 7 is a schematic diagram showing a recording scheme for a hierarchical encryption system in FIG. 2; FIG.

Fig. 8 is a schematic diagram showing a copy protection system on reproduction of a disc in Fig. 3;

***** Description of the symbols for the main parts of the drawings *****

10: producer input unit 11: media key generation unit

12: Media ID generation unit 13: Title key encryption unit

14: content encryption unit 15: content recording unit

16: Reader 17: Title Key Generator

18: Content decryption unit 19: Content encryption or not identification unit

20: watermark identification unit 21: playability determination unit

The present invention relates to an apparatus and method for encrypting and recording a disk, and more particularly, to an apparatus and method for encrypting and recording a disk to prevent unauthorized copying and playback of data stored on the disk with a simple and powerful hierarchical encryption technique. It is about.

With the advent of the digital age, various works such as movies and music are being sold and distributed in the form of digital content. The characteristics of the digital content are the same as those of the original and the copy is easy to copy and distribute.

In particular, recently, with the development of mass storage media and ultra-high speed transmission media, unauthorized copying and reproducing are more serious trends, which 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 copy protection system is applied, and divided into a lead-in area composed of a disc key block and an encrypted title key and a recordable user data area composed of encrypted content as shown in FIG. After encrypting the disk key using the device key, the title key is encrypted with the disk key, the content is encrypted with the title key, and decryption is performed in the reverse order of the above.

At this time, the disk key, title key, and content can be easily replicated through bit replication or general replication, and there is no way to check the type of the disk.

That is, as described above, the conventional technology has a problem in that data is copied or reproduced without permission as a mass storage medium and an ultrafast transmission medium are developed.

Accordingly, the present invention, which was devised in view of the above problems, uses an encryption system for content stored on a ROM disk and a watermark inserted into the content to encrypt and record an encrypted disk to prevent unauthorized reproduction and reproduction of the content. It is an object of the present invention to provide a reproducing apparatus and method.

The present invention for achieving the above object is a producer input unit for inputting the manufacturer input information; A media key generation unit for encrypting and outputting a media key according to producer input information inputted to the producer input unit; A media ID generator for generating a media ID; A title key encryption unit which receives the producer input information and encrypts and outputs a title key; A content encryption unit which receives the original content and encrypts it by the title key and outputs the encrypted content; And a content recording unit which receives the encrypted content from the content encryption unit and writes the encrypted content to the disc.

The present invention for achieving the above object is a content encryption or not identification unit for receiving the content recorded on the disk to determine whether to encrypt the content; A reader for reading producer input information recorded on the disc and outputting title key generation information accordingly; A title key generation unit for receiving title key generation information of the reader and generating a title key according thereto; A content decoding unit which receives the encrypted content from the content encryption or not identification unit and decrypts the content by the title key; A watermark identification unit which receives original content from the content decoding unit or the content encryption whether identification unit, and determines whether or not there is a watermark; And a playback determination unit that determines whether or not the content is to be played by the watermark information determination signal of the watermark identification unit and outputs a play / stop signal according to the watermark identification unit.

The present invention for achieving the above object comprises a first step of generating a title key using a stamper ID, media type information, media key, media ID; Encrypting original content using the title key of the first step; And performing a third step of recording the content encrypted in the second step to the disc.

The present invention for achieving the above object comprises a first step of determining whether the disk is encrypted after checking the media type, media ID and media key recorded on the disk with a reader; A second step of determining whether a watermark is present after decrypting the content if the encryption is not performed or the encryption result is determined in the first step; As a result of the determination in the second step, if there is a watermark without encryption, reproduction of the data recorded on the disc is stopped, and if there is no watermark without encryption, or if there is a watermark that is encrypted and cannot be copied, it is recorded on the disc. And performing a third step of reproducing the data.

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

Fig. 2 is a block diagram showing the configuration of an encryption recording apparatus of the present invention disk, which includes a producer input unit 10 for inputting producer input information as shown therein; A media key generation unit 11 for encrypting and outputting a media key according to the producer input information of the producer input unit 10; A media ID generator 12 for generating a media ID; A title key encryptor (13) for receiving the producer input information and encrypting and outputting a title key; A content encryption unit 14 which receives the original content and encrypts the original content by using the title key; And a content recording unit 15 which receives the encrypted content from the content encryption unit 14 and records it on a disc.

Fig. 3 is a block diagram showing the structure of an encrypted reproducing apparatus of the present invention, and as shown therein, a content encryption or notation unit 19 for receiving content recorded on the disc and determining whether the content is encrypted; A reader (16) which reads producer input information recorded on the disc and outputs title key generation information accordingly; A title key generator 17 for receiving title key generation information of the reader 16 and generating a title key according thereto; A content decrypting unit (18) which receives the encrypted content from the content encrypting or not identifying unit (19) and decrypts it with the title key; A watermark identification unit (20) for receiving the original content from the content decoding unit (18) or the content encryption or not identification unit (19) to determine whether a watermark is present; The watermark identification unit 20 is configured to determine whether or not the content is reproduced by the watermark information presence determination signal and the reproduction status determination unit 21 for outputting the reproduction / stop signal accordingly.

Fig. 4 is an operation flowchart of an encryption recording method of a disc of the present invention, which shows a first step of generating a title key using a stamper ID, media type information, a media key, and a media ID as shown in the figure; Encrypting original content using the title key of the first step; And a third step of recording the content encrypted in the second step to the disc.

FIG. 5 is a flowchart illustrating an encryption playback method of a disk according to the present invention. As shown in FIG. 5, an apparatus for determining whether a disk is encrypted after checking the media type, media ID, and media key recorded on the disk by the reader 16 is shown. Step 1; A second step of determining whether a watermark is present after decrypting the content if the encryption is not performed or the encryption result is determined in the first step; As a result of the determination in the second step, if there is a watermark without encryption, reproduction of the data recorded on the disc is stopped, and if there is no watermark without encryption, or if there is a watermark that is encrypted and cannot be copied, recording on the disc The third step of regenerating the data is performed, and this operation of the present invention will be described.

First, at the time of recording, the user generates and outputs producer input information through the producer input unit 10, and then the media key generator 11 encrypts and outputs the media key by the device key.

In this case, the producer input information includes at least one of stamper ID, media type information, and 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, and then the title key encryption unit 13 sends the media ID, the media key, the stamper ID, and the media type information. Receives and encrypts the title key accordingly.

Thereafter, 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 records the encrypted content on the disc. Done.

Here, as shown in FIG. 7, the content without the watermark is recorded without performing encryption because the content is allowed for unlimited copying, and the content with the watermark is encrypted and recorded because the content has conditions and limitations for copying.

At this time, as shown in Fig. 6, the disc records an unrecordable lead-in area in which a media key block and a media ID are recorded, a recordable lead-in area in which a title key encrypted with the media key is recorded, and a media type. And a user data area in which the content encrypted with the title key is recorded, and is encrypted hierarchically.

That is, the device key encrypts the media key, the media key encrypts the title key, and the title key encrypts the content and is recorded on the disk, and 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 on the specific disk cannot be decrypted on the disk with the other media ID, and the ROM type can be distinguished because the media type includes the physical characteristics. This can be checked if a copy has been made to a recordable disc.

In contrast to the above, during playback, the reader 16 reads the media type, media ID, media key, and device key recorded on the disc, and outputs the title key generation information accordingly, and then the title key generation unit 17 It receives the title key generation information of the reader 16 and outputs the title key accordingly.

At this time, the content encryption or not identification unit 19 receives the content recorded on the disk and determines whether the content is encrypted or not. The received key is decoded by the title key of the title key generation unit 17 and output to the watermark identification unit 20.

Then, the watermark identification unit 20 receives the original content, identifies whether a watermark exists in the content, and outputs the watermark information according to the reproduction content determining unit 21.

Accordingly, the reproduction determination unit 21 determines whether the content is reproduced based on the watermark information of the watermark identification unit 20 and outputs a reproduction / stop signal according to it, that is, the water is not encrypted. If the content does not have a mark or is encrypted and watermarked as non-copyable, the content is played normally. If the content is not encrypted, the content without watermark is regarded as illegal copy and stops playback.

That is, as shown in Fig. 8, the media type is determined from the physical characteristics of the disk, and the media ID and the media key block are read from the non-recordable lead-in area of the disk. Check.

In this case, the ROM disk has a unique media key, which prevents bit duplication or general duplication.

Then, it is checked whether or not the content on the ROM 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, and the content is not encrypted and watermarked content. It regards it as an illegal copy and stops playback.

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

As described in detail above, the present invention encrypts the content and data on the ROM disk, thereby preventing unauthorized playback, and since each ROM disk has a different media ID and title key, unauthorized reproduction of the content becomes impossible. In addition, it is possible to check and allow reproduction of information related to the duplication of encrypted content recorded on the ROM disc and to allow and stop the reproduction, and also to prevent unauthorized duplication of digital contents, thereby preventing unauthorized duplication of digital content.

Claims (16)

A producer input unit for inputting producer input information; A media key generation unit for encrypting and outputting a media key according to producer input information inputted to the producer input unit; A media ID generator for generating a media ID; A title key encryption unit which receives the producer input information and encrypts and outputs a title key; A content encryption unit which receives the original content and encrypts it by the title key and outputs the encrypted content; And a content recording unit which receives the encrypted content from the content encryption unit and writes the encrypted content to the disk. The apparatus of claim 1, wherein the producer input information includes at least one of stamper ID, media type information, and device key. The apparatus of claim 2, wherein the producer input information may further include other information in addition to at least one of stamper ID, media type information, and device key. 2. The disc of claim 1, wherein the disc comprises a non-recordable lead-in area in which a media key block and a media ID are recorded, a recordable lead-in area in which a title key encrypted with the media key is recorded, and an area in which a media type is recorded; And a user data area in which the content encrypted with the title key is recorded. 5. The apparatus of claim 2 or 4, wherein the media type includes a physical property that physically distinguishes the disk. 5. The apparatus of claim 4, wherein the media key block is a set of media keys encrypted by respective device keys. A content encryption / identifier for receiving content recorded on the disc and determining whether the content is encrypted; A reader for reading producer input information recorded on the disc and outputting title key generation information accordingly; A title key generation unit for receiving title key generation information of the reader and generating a title key according thereto; A content decoding unit which receives the encrypted content from the content encryption or not identification unit and decrypts the content by the title key; A watermark identification unit which receives original content from the content decoding unit or the content encryption whether identification unit, and determines watermark information; And a playback determination unit for judging whether or not the content is to be played based on watermark information of the watermark identification unit and outputting a play / stop signal according to the watermark information. 10. The apparatus of claim 7, wherein the playback decision unit plays back the content if the content is not encrypted and has no watermark or is encrypted and cannot be copied. An encryption / playback apparatus for a disc, characterized in that it is considered illegal copying and stops playback. The apparatus of claim 7, wherein the producer input information includes at least one of a stamper ID, media type information, and a device key. 10. The apparatus of claim 9, wherein the producer input information may further include other information in addition to one or more of stamper ID, media type information, and device key. 8. The disk of claim 7, wherein the disc comprises: a non-recordable lead-in area in which a media key block and a media ID are recorded, a recordable lead-in area in which a title key encrypted with the media key is recorded, and an area in which a media type is recorded; And a user data area in which the content encrypted with the title key is recorded. The apparatus of claim 9 or 11, wherein the media type includes a physical property that physically distinguishes the disk. 12. The apparatus of claim 11, wherein the media key block is a set of media keys encrypted by respective device keys. Generating a title key using a stamper ID, media type information, a media key, and a media ID; Encrypting original content using the title key of the first step; And a third step of recording the content encrypted in the second step to the disc. 15. The method of claim 14, wherein the first step comprises encrypting the media key with a device key. Checking a media type, a media ID, and a media key recorded on the disk with a reader and determining whether the disk is encrypted; A second step of determining whether a watermark is present after decrypting the content if the encryption is not performed or the encryption result is determined in the first step; As a result of the determination in the second step, if there is a watermark without encryption, reproduction of the data recorded on the disc is stopped, and if there is no watermark without encryption, or if there is a watermark that is encrypted and cannot be copied, recording on the disc And reproducing the encrypted data in a third step.

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