JP2001027968A - Storage medium and its reproduction system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inhibit the looking/listening of a storage medium that is illegally produced by recording a code showing a medium which cannot be recorded again as the medium identification information and a code which is different from a code showing the inhibition of duplication as the duplication management information and showing the inhibition of re-duplication. SOLUTION: A code showing a medium which cannot be recorded again as the medium identification information is recorded together with a code which is different from a code showing the inhibition of duplication as the duplication management information and showing the inhibition of re-duplication. Then the medium identification information showing the type of a storage medium 60 that is used by a recorder 70 is inputted from an input device 40 to a recording signal processing circuit 50 of this recording system, and also the duplication management information showing the priority of producing more duplications is inputted from the medium 60 to the circuit 50. The circuit 50 performs the prescribed processing of the inputted and enciphered video and voice signals and the key information, medium identification information and duplication management information and then outputs these processed signals and information to the recorder 70 to use them as the recording data based on the recording format of the medium 60.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a storage medium and a reproduction system therefor, and more particularly, to a storage medium that has been legally sold or distributed, a storage medium that has been recorded properly, and a medium that has been illegally copied. The present invention relates to a copyright-protected storage medium that cannot be played back and a playback system therefor.

[0002]

2. Description of the Related Art A video signal processing apparatus, a video signal processing method, and a recording medium for ensuring copyright protection for a high-quality video signal obtained by a video disk, a digital VTR, a digital broadcast receiving apparatus, and the like. For the technology, see, for example,
No. 56 is described.

[0003]

The above-mentioned prior application publication discloses that
A copy prevention technique using generation management information is shown. However, there is no mention of a technology that makes it impossible to reproduce an illegally created storage medium.

[0004] The object of the present invention is to make it impossible to view a storage medium created illegally, and to store a storage medium created and sold or distributed legally, or a storage medium recorded according to a regular method. It is an object of the present invention to provide a storage medium and a reproduction system thereof, which can be reproduced and viewed.

[0005]

A storage medium according to the present invention is recordable in which at least medium identification information, copy management information, an encrypted main signal, and key information necessary for the encryption are recorded. Is a storage medium in which the same portion once recorded cannot be erased and re-recorded. The medium identification information includes a code indicating that the storage medium cannot be re-recorded, and the copy management information includes a code indicating re-reproduction impossible, which is different from the code indicating non-reproduction. . This makes it possible to identify, from a storage medium on which a duplication-prohibited signal is recorded and which cannot be directly recorded, by illegally copying the contents of the storage medium as it is by any means, so that the illegally copied storage medium cannot be viewed. can do.

[0006] A storage medium reproducing system according to the present invention comprises a reproducing apparatus for reproducing bit-compressed information that is at least partially encrypted, encryption / decryption processing means, decompressed signal processing means, and an output terminal. Detection control means for detecting the medium identification information and the copy management information from the storage medium, and stopping the output of the bit-extended information from the output terminal according to the relationship between the medium identification information and the copy management information, It is characterized by having. This makes it impossible to view when the illegally duplicated storage medium is detected.

Further, the storage medium reproducing system according to the present invention detects a type of the storage medium based on the physical characteristics of the storage medium and a reproduction apparatus for reproducing bit-compressed information at least partially encrypted. Medium detection means, encryption / decryption processing means, decompression signal processing means, output terminals, and medium identification information detected from the reproduced information, and the detected information detected by the medium detection means is compared with the medium identification information. And a detection control means for stopping the output of the bit-expanded information from the output terminal when the two are different. This makes it impossible to view when the illegally duplicated storage medium is detected.

[0008]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a diagram showing a configuration example of a recording system for a storage medium according to an embodiment of the present invention. In FIG. 1, 10 is a signal source, 20 is a compressed signal processing circuit, 30 is an encrypted signal processing circuit, 40 is an input device, 50 is a recording signal processing circuit, 60 is a storage medium, 7
Reference numeral 0 denotes a recording device for recording on a storage medium.

The signal source 10 is, for example, a video tape recorder. The video signal and the audio signal output from the signal source 10 are input to a compression signal processing circuit 20 and are bit-compressed. As a compression signal processing method, for example, MPEG2
(Motion (Moving) Picture Experts Group Phase 2) is used. The video signal and the audio signal compressed by the compression signal processing circuit 20 are input to the encryption signal processing circuit 30.

A key signal for encryption is input from the input device 40 to the encryption signal processing circuit 30. This key signal becomes key information when the video signal and the audio signal are encrypted by the encryption signal processing circuit 30. The video signal and the audio signal encrypted by the encryption signal processing circuit 30 and the key information used at the time of compression are input to the recording signal processing circuit 50.

The recording signal processing circuit 50 receives, from the input device 40, medium identification information indicating the type of the storage medium 60 used in the recording device 70, and a copy indicating whether or not a copy can be made from the recording medium 60. Management information is entered.

The recording signal processing circuit 50 converts the input encrypted video signal and audio signal, key information, medium identification information, and copy management information into recording data in accordance with the recording format of the storage medium 60. , And performs appropriate signal processing such as signal rearrangement processing and error correction code addition processing, and outputs the result to the recording device 70.

In the recording device 70, the inputted encrypted video signal and audio signal, key information, medium identification information, and copy management information are recorded in the storage medium 60 according to the format. Here, the video signal and the audio signal are the main signals.

When the storage medium 60 is a disk-shaped recording medium, and when the medium on which the information is recorded is sold or distributed in large quantities, based on the recorded storage medium 60 created according to the recording system shown in FIG. A disk-shaped recording medium can be prepared by using a technique such as injection molding or the like, which is a well-known technique. This completed disk-shaped recording medium is a storage medium that cannot be directly recorded. In the case of small-volume production, the above-described method requires the cost of producing a mold or the like, and therefore, the storage medium 60 recorded by the recording device 70 may be directly sold or distributed. An example of the disk-shaped recording medium in this case is a disk-shaped substrate on which a dye is applied using a spinner. The recording device 70 records a main signal and various information data by irradiating the disk-shaped recording medium coated with the dye with a laser beam to change the state of the dye. In this case, the state of the dye is not reversible, and the recorded data is recorded on the disk-shaped recording medium in a non-rewritable manner.

As described above, there are various types of storage media 60, and in each of these cases, the medium identification information input from the input device 40 is different. FIG. 2 shows an example of the type of each storage medium and the medium identification information.

A storage medium 60 made by injection molding or the like.
Is a medium that cannot be directly recorded from the beginning, so that medium identification information (“00” in the example shown in FIG. 2) indicating a medium that cannot be directly recorded is input. When the recorded storage medium 60 is used for sale or distribution as it is in the case of small-scale production, the medium identification information input from the input device 40 is the medium identification information indicating a recordable medium. Among recordable media, there are a medium on which data can be erased after recording once and other information cannot be rewritten again, and a medium on which data can be rewritten. Therefore, in the case of the example shown in FIG. 2, "01" or "11" is input as the medium identification information according to the type of the medium. The medium identification information “00”, “01”, “1”
1 "is an example used to explain the present invention,
It goes without saying that a different code may be used as the medium identification information.

FIG. 3 shows an example of the copy management information. Here, “0” is used as the copy management information.
0, 01, 10, and 11. For example, “11” indicates that copying is not permitted and copying is not permitted.
“10” indicates that only one generation can be copied, “01” indicates that re-copying is not possible, and “00” indicates that copying is possible. For the copy management information, it is meaningful to assign different codes depending on whether copying is prohibited or re-copying is prohibited, and is directly assigned to the codes “00”, “01”, “10”, and “11” used in FIG. There is no real meaning. However, since it is four information, 2
It can be represented by a code of bits, and if codes are assigned as in the example shown in FIG. 3, the number of bits used can be minimized.

A specific method of using the copy management information will be described below. When paying for a new movie after collecting the viewing fee and broadcasting it, for example, if copying on a disk recorder or video tape recorder is not allowed at all,
If it is not allowed to make a copy from a video disk or video tape on a recorded video disk or video tape such as a movie at all, "1" is used as the copy management information.
1 "is added to broadcast or sell or distribute video discs and video tapes. The recorded video disc shown here is one in which information is fixed on a disc-shaped recording medium, and the information is rewritten later. It is assumed that the medium cannot be directly recorded, that is, the medium having the medium identification information “00” that cannot be directly recorded as shown in FIG.

In the case where a movie or the like is broadcasted for free, for example, when the video is recorded by a video tape recorder or a disk recorder and the user is allowed to view the video at a later time, the broadcast is set with the copy management information set to "10". Do. If the received signal is to be recorded by a video tape recorder or a disc recorder, the duplication management information is changed to "01" for prohibiting re-duplication and then recorded. As described above, in the case where a copy is normally created using a recordable storage medium, the copy management information is set to “01” instead of “11”, so that all copy-impossible media can be used regardless of the means. Can be distinguished from a medium that has been copied to a recordable medium as it is and sold, and copyright can be easily protected.

In addition, in the case of a broadcast or a public broadcast that becomes insignificant after a certain period of time, such as a weather forecast, if it is permitted to freely make a copy using a video tape recorder or a disc recorder, the duplication may be performed. "00" is added as management information and broadcast. In this case, in the recording system shown in FIG. 1, the encryption signal processing in the encryption signal processing circuit 30 becomes unnecessary.

In the above description, a specific example has been shown focusing on broadcasting. However, the same concept applies to the sale and distribution of recorded storage media that cannot be directly recorded. By distributing, the propriety of duplication can be managed.

Next, a method for reproducing the recorded storage medium created as described above and a method for managing illegal duplication will be described.
This will be described with reference to FIG. FIG. 4 is a diagram showing the configuration of an embodiment of a storage medium reproducing system for reproducing a storage medium according to the present invention. The playback system according to the present embodiment assumes a system used in a general home.

In FIG. 4, reference numeral 100 denotes a storage medium;
Is a storage medium reproducing device, 115 is a medium detecting device for detecting the type of medium, 120 is a detection control circuit, 130 is an encryption / decryption processing circuit, 140 is a decompression signal processing circuit, and 150 is an output terminal.

The storage medium 100 refers to a recorded medium that cannot be directly recorded or the storage medium 60 directly recorded by the recording system shown in FIG.
Will be played back. Here, the storage medium 100 will be described as an optical disk.

In the reproducing apparatus 110, the medium type is physically detected directly by using the medium detecting apparatus 115 provided therein, separately from the medium identification information recorded in the storage medium 100. A medium that cannot be directly recorded and a medium that can be directly recorded, which are created by injection molding, have information "1",
The reflectivity of the bit indicating “0” differs depending on the type of the storage medium. In the case of a directly recordable medium, lands or grooves are formed on the disk for tracking or addressing for recording. Because the boundaries are modulated or the addressing is different, it is possible to physically identify the medium.

The bit-compressed video signal and audio signal, which are the main signals recorded in the storage medium 100, are reproduced by the reproducing device 110 and input to the encryption / decryption circuit 130 via the detection control circuit 120. The video signal and the audio signal whose codes have been decrypted in the decryption circuit 130 are input to the decompression signal processing circuit 140 and the bit-compressed video signal,
The audio signal is bit-extended and output from the terminal 150.

The medium information directly detected by the medium detection circuit 115 is input to the detection control circuit 120,
The data reproduced from the storage medium 60 is also input to the detection control circuit 120. The detection control circuit 120 detects medium identification information, key information, and copy management information of the storage medium 100 from the input reproduction data. Detection control circuit 120
Then, the medium information directly detected by the medium detection device 115 is compared with the medium identification information recorded on the storage medium 100, and if they are different, it is determined that some illegal duplication has been performed, and the compressed video information and audio The decompression processing circuit 140 is controlled so that the information is not decompressed. In the embodiment shown in FIG. 4, the detection control circuit 120 is
The reproduction output of the video signal and the audio signal, which are the main signals, is prohibited by controlling the control signal 40. However, the reproduction output of the main signal may be prohibited by controlling the encryption / decryption circuit 130 or the output terminal 150. Good.

Next, a description will be given of a determination as to whether reproduction output is possible or not when the medium information detected by the medium detection device 115 matches the reproduced medium identification information. FIG. 5 shows a criterion used at this time to determine whether or not illegal duplication has been performed.

If the medium information detected by the medium detection device 115 matches the reproduced medium identification information, the following processing is further performed. In other words, in the case of a medium that cannot be directly recorded, the medium identification information is “00”, but the copy management information is “11” and cannot be copied, or the copy management information is “10” and only one generation can be copied. If it is not encrypted, it is determined that some illegal duplication has been performed, and the detection control circuit 120 sends the expanded signal processing circuit 14
A control signal is sent to 0 to control not to expand the compressed signal. Alternatively, even if the medium cannot be directly recorded (medium identification information is “00”), and the duplication management information is “01” and the state cannot be re-reproduced, it is assumed that there is no rule, and the decompression signal processing is not performed. Control.

A recordable medium (medium identification information is "0"
(1) or "11"), if the copy management information indicates that the copy of "11" is not possible or that only one generation of "10" is possible, it is determined that illegal copy has been performed, and the decompression is also performed. Originally, a recordable medium should record an input signal that can be duplicated for only one generation or a signal that can be copied freely.
Therefore, when a signal indicating that only one generation can be duplicated is recorded, the duplication management information is replaced and “0”, which indicates that duplication is impossible.
It should be "1", and if a signal that can be freely copied is recorded, it should be "00" indicating that copying is possible. In other words, reproduction is allowed only in these two cases. In the example shown in FIG. 5, even if the duplication management information is “01” and cannot be re-duplicated, if it is not encrypted, it is determined that some illegal duplication has been performed.

In the case of small-volume sales or distribution using a recordable medium, what kind of management information should be used when duplication is prohibited, as described above, If the unacceptable copy management information “11” is used, the reproduction cannot be performed in the reproduction system that prohibits the reproduction of the illegally created storage medium based on the above-described determination criteria. Therefore, in the case of disabling copying at the time of small-volume sales or distribution using such a recordable medium, sale or distribution is performed by adding copy management information “01” indicating that re-copying is not possible. . As a result, it is possible to perform reproduction while prohibiting duplication without affecting others, and when the duplication is illegally performed and the data is not encrypted, the reproduction medium of the illegally duplicated storage medium can be reproduced. Playback can be disabled.

FIGS. 6 and 7 show other examples of the recording system. FIG. 6 shows an example in which the inputted compressed and encrypted bit stream is recorded as it is. In FIG. 6, reference numeral 200 denotes a signal input / output terminal;
Is a copy management information detection circuit, 240 is a copy management information change control circuit, 250 is a recording signal processing circuit, 260 is a storage medium, 270 is a recording device, 275 is a medium detection device that detects the type of storage medium, and 290 is a medium detection device. This is a recording system for a storage medium.

From the terminal 200, copy management information, authentication information for authenticating whether or not the storage medium recording system 290 is a legitimate device (system), and a signal including a bit stream as a main signal are input. The signal input from the terminal 200 is supplied to the detection circuit 210 and the recording signal processing circuit 25.
Input to 0. The detection circuit 210 authenticates whether the signal source (not shown) and the storage medium recording system 290 are mutually proper devices (systems). If the devices are recognized as valid devices, the actual recording operation can be started. However, if the devices are not recognized as valid devices, the input signal input from the terminal 200 is cut off or the recording operation is stopped. Do not do.

If the device is recognized as a legitimate device (system), the detection circuit 210 detects the copy management information and
If the duplication is impossible (duplication management information is "11") and if the duplication is impossible (duplication management information is "01"), the operation of the recording signal processing circuit 250 via the change control circuit 240 is prohibited. . When the recording is permitted, the duplication is permitted (duplication management information is “00”) or only one generation is duplicatable (duplication management information is “10”), the operation of the recording signal processing circuit 250 via the change control circuit 240 However, if only one generation can be copied, the duplication management information is changed to non-reproducible (duplication management information is “01”) and recording signal processing is performed.

The recording device 270 has a medium detection device 275, detects the type of the storage medium 260 to be recorded, and transmits information of the detected storage medium 260 (medium identification information) to the recording signal processing 250. According to the format, the data is written to the storage medium 260 to be finally recorded. By having the medium detection device 275, writing of incorrect medium identification information can be prevented. With the above processing, the normal duplication processing can be performed.

FIG. 7 shows an example in which the recording system of the storage medium performs compression signal processing and encryption processing. 7, reference numeral 300 denotes a signal input / output terminal; 310, a copy management information detection circuit; 320, a compressed signal processing circuit; 330, an encrypted signal processing circuit; 340, a copy control information change control circuit; The circuit 390 is a recording medium recording system. Note that 260 is a storage medium, 270 is a recording device, and 275 is a medium detection device that detects the type of storage medium.

In the recording system shown in FIG.
In the same manner as the system shown in (1), copy management information, authentication information for authenticating whether or not this storage medium recording system 390 is an authorized device (system), and a signal including a main signal are input from a terminal 300. . The signal input from the terminal 300 is input to the detection circuit 310 and the compression signal processing circuit 320. The authentication of the recording medium recording system 390 is performed as shown in FIG.
The detection is performed by the detection circuit 310 as in the system shown in FIG.

When it is recognized by the authentication process that the device is a legitimate device (system), the detection circuit 310 detects the copy management information and disables the copy (the copy management information is "1") shown in FIG.
1 "), re-copying is not possible (copy management information is" 01 ")
In this case, the operation of the recording signal processing circuit 350 via the change control circuit 340 is prohibited. If recording is permitted, and duplication is permitted (duplication management information is “00”) or only one generation is duplicatable (duplication management information is “10”), the operation of the recording signal processing circuit 350 via the change control circuit 340 However, if only one generation can be copied, the duplication management information is changed to non-reproducible (duplication management information is “01”) and recording signal processing is performed. At this time, since the encryption is unnecessary when the copying is permitted as shown in FIG. 3, the encryption signal processing circuit 330 does not perform the encryption process, and the main signal compressed by the compression signal processing circuit 320 is directly recorded signal processing. Input to the circuit 350. When only one generation can be copied, the main signal compressed by the compression signal processing circuit 320 is encrypted by the encryption circuit 330 and input to the recording signal processing circuit 350.

Thereafter, the system operates in the same manner as the system shown in FIG.

[0040]

As described above, according to the present invention, when copying is prohibited, if the storage medium cannot be directly recorded,
In the case of a storage medium that can be copied but cannot be re-recorded by erasing the same portion once recorded, a code indicating re-prohibition different from the code indicating re-prohibition is added. . This makes it possible to distinguish a signal recorded on a storage medium that cannot be directly recorded from a signal that cannot be copied from a recording medium that can be illegally recorded in some way as it is, by discarding the signal on a storage medium that can be illegally recorded. Can not be viewed.

Further, according to the present invention, the medium identification information and the copy management information are detected from the storage medium, and when illegality is detected based on the relationship, the output of the bit expanded information is stopped. In addition, when a storage medium that is illegally duplicated is detected, it can be prevented from being viewed.

Further, according to the present invention, the medium identification information is detected from the physical characteristics of the storage medium and the reproduced information, respectively, and these are compared. By stopping the output of the storage medium, it is possible to prevent the user from viewing when the illegally duplicated storage medium is detected.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a first example of a configuration of a recording system for a storage medium according to the present invention.

FIG. 2 is an explanatory diagram showing an example of the type of storage medium and its identification information.

FIG. 3 is an explanatory diagram showing an example of copy management content and its management information.

FIG. 4 is a block diagram showing a configuration of an embodiment of a storage medium reproducing system for reproducing a storage medium according to the present invention.

FIG. 5 is an explanatory diagram showing an example of a determination criterion for determining whether or not decompression is possible based on medium identification information, copy management information, and the presence or absence of encryption in the reproduction system of FIG.

FIG. 6 is a block diagram showing a second example of the configuration of a recording system for a storage medium according to the present invention.

FIG. 7 is a block diagram showing a third example of the configuration of a recording system for a storage medium according to the present invention.

[Explanation of symbols]

 20, 320 compression signal processing circuit 30, 330 encryption signal processing circuit 40 input device 50, 250, 350 recording signal processing circuit 60, 100, 260 storage medium 70, 270 recording device 110 reproduction device 115, 275 medium detection device 120 detection Control circuit 130 Encryption / decryption processing circuit 140 Decompression signal processing circuit 150 Output terminal 200, 300 Input / output terminal 210, 310 Detection circuit 240, 340 Change control circuit

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yukio Isobe 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside Digital Media Development Division, Hitachi, Ltd. (72) Inventor Akinobu Watanabe 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa-ken Address F-term (reference) 5B017 AA06 CA09 Digital Media Development Division Hitachi, Ltd.

Claims (4)

[Claims] 1. A recordable, but once recorded, same portion in which at least medium identification information, copy management information, an encrypted main signal, and key information necessary for the encryption are recorded, are erased and re-recorded. A code indicating that the storage medium is a storage medium that cannot be recorded, and is a storage medium that can be recorded but cannot be re-recorded by erasing the same portion once recorded as the medium identification information. A storage medium characterized by recording, as information, a code indicating re-reproducibility different from a code indicating re-prohibition. 2. A reproducing apparatus for reproducing bit-compressed information, wherein at least a part of the information recorded on a storage medium is encrypted, and an encryption / decryption apparatus for decrypting the encrypted information reproduced by the reproducing apparatus. Processing means; decompression signal processing means for bit-expanding the information decrypted by the encryption / decryption processing means; an output terminal for outputting the information bit-expanded by the decompression signal processing means; and information reproduced by the reproduction apparatus. Detecting control means for detecting at least the medium identification information and the copy management information, and stopping the output of the bit expanded information from the output terminal according to the relationship between the medium identification information and the copy management information. A reproduction system for a storage medium, comprising: 3. The storage medium reproducing system according to claim 2, wherein the medium identification information is information indicating that the recording medium is a storage medium which is recordable but cannot be re-recorded by erasing the same portion once recorded. In some cases, the detection control means causes the bit-expanded information to be output from the output terminal when the duplication management information is information indicating re-reproduction impossible or information indicating duplication possible, which is different from duplication impossible. And outputting the bit-decompressed information from the output terminal if the copy prohibition information or the information indicating that only one generation can be copied. 4. A reproducing apparatus for reproducing bit-compressed information, at least a part of which is recorded on a storage medium, and a medium detecting means for detecting a type of the storage medium from physical characteristics of the storage medium. Encryption / decryption processing means for decrypting the encryption of the encrypted information reproduced by the reproduction apparatus; expansion signal processing means for bit-expanding the information decrypted by the encryption / decryption processing means; An output terminal for outputting bit-expanded information at, detecting at least medium identification information from the information reproduced by the reproduction apparatus, and detecting the storage medium and the medium identification information detected by the medium detection means. And a detection control means for stopping the output of the bit-decompressed information from the output terminal when the two are different from each other. .