JP6548845B2 - Digital content transmission / reception system and digital content transmission / reception method - Google Patents

Description

The technical field relates to devices for recording and / or reproducing digital information. In particular, the present invention relates to the technology of copy control in an apparatus.

With regard to the above technical field, Patent Document 1 aims to "provide an apparatus and method capable of restricting recording on a recording medium in a recording / reproducing apparatus for digital information to be protected by copyright" as a problem means. Recording and playback control circuit, copy control information (Copy One Generatio
In the case of n), together with the information, converted digital information obtained by converting the information to a predetermined bit rate, and the copy number information are recorded on the recording medium, and according to the copy control information (Co
When moving the digital information or the converted digital information to the recording medium of the recording apparatus connected to the reproduction apparatus while py No More), the number of possible times is reduced to update the copy number information, and An information signal or the converted digital information, the copy control information, and the copy number information are recorded on the recording medium again, and the digital information signal or the converted digital information is not reproduced. Is stated.

Unexamined-Japanese-Patent No. 2006-114090

In recent years, with the spread of digital broadcasting, various recording media are in circulation, and the form of viewing digital content is also various. In such an environment, it is conceivable to control data transmission / reception between a plurality of recording devices or recording media by using copy control information from the viewpoint of copyright protection. However, control based on copy control information complicates determination of whether copying is possible between arbitrary devices, which reduces the usability for the user. In the digital information recording and reproducing method shown in Patent Document 1, the copy control information is Copy Once Ge.
The ease of use is improved by managing the number of times of copying of the digital information, which is the deletion, and displaying the information of the number of times of copying to the user.

However, in the digital information recording and reproducing apparatus shown in Patent Document 1, it is assumed that digital data is recorded by separating copying impossible and plural copying possible according to the type of recording medium as a copy control method of digital information. It does not describe about the control method.

In order to solve the above problems, an aspect of the present invention transmits digital content from a transmitting device, and in a receiving device, in a digital content transmitting / receiving system for receiving the digital content, the transmitting device generates the digital content A content generation unit, digital content generated by the content generation unit, and first control information and second control information on copy control of the digital content, or generated by the content generation unit A transmitting unit for transmitting the digital content and the first control information without attaching the second control information, wherein the first control information can be copied at least one generation in the copying of the digital content It is possible to indicate the state of and the state of copy-enabled without constraints Output protection information indicating whether or not to protect the output of the digital content when the copy control information includes copy control information and the copy control information can be copied without restriction conditions; And the copy control information includes copy control mode information indicating whether or not the digital content is a number-restricted copy-permitted content when the copy control information is one-generation copyable, and the receiving device is configured to transmit the transmitted digital content From the first recording medium, a first recording and reproducing unit for recording the digital content received by the receiving unit on a first recording medium, and reproducing the digital content from the first recording medium, and An output unit for outputting reproduced digital content; a second recording unit for recording the digital content received by the receiving unit on a second recording medium; A control unit for controlling the receiving unit, the first recording and reproducing unit, the output unit, and the second recording unit, and one copy of the copy control information is permitted in the control state of the control unit. And, when the copy control mode information indicates that the digital content is a content limited copy permitted content, and the copy control information is one generation copy enabled, and the copy control mode information is The digital content received is recorded on the first recording medium when not attached to the digital content, and the number of digital copies that can be generated from the recorded digital content is controlled to be within a predetermined number. A first state in which the recorded digital content is reproduced and output as one generation copy enabled, and the copy control information allows one generation copy, and In the case where the copy control mode information indicates that the digital content is a content subject to a limited number of copies, and the copy control information is copyable for one generation, and the copy control mode information is attached to the digital content. If the second recording medium does not correspond to the recording of the content for which the number restriction copy is possible, the second recording medium records the received digital content as the recopy prohibition on the second recording medium. The received digital content when the state is that the copy control information indicates that one-generation copying is possible, and the copy control mode information indicates that the digital content is not content that permits number-limited copying; A third state in which re-copying is prohibited on the recording medium 1 and the copy control information are restricted And, when the output protection information indicates that output protection is to be performed, the received digital content is encrypted and copied onto the first recording medium without restriction conditions and recorded. The received digital content when the copy control information indicates that copying is possible without constraints, and the output protection information indicates that protection is not performed at the time of output. The fifth aspect of the present invention is characterized in that there is a fifth state in which the recording medium of the fourth aspect of the present invention is recorded without being encrypted as encryption without restriction.

Further, according to one aspect of the present invention, there is provided a digital content transmitting / receiving method of transmitting digital content from a transmitting device and receiving the digital content in a receiving device, wherein the transmitting device generates the digital content. Transmitting the generated digital content, first control information and second control information on copy control of the digital content, or generating the generated digital content and the first control information; Transmitting without transmitting the second control information, wherein the first control information includes at least one generation copy enabled status and copy enabled status without constraints in the copying of the digital content. Copy control information that can be shown; and When output protection information indicating whether or not to perform protection at the time of output of the digital content when the copy control information can be copied without restriction conditions, and when the copy control information is copyable for one generation A copy control mode information indicating whether or not the digital content is a content limited copy permitted content, and in the reception device, the reception step of receiving the transmitted digital content, and the reception step Recording the received digital content on a first recording medium, reproducing the digital content from the first recording medium, and outputting the digital content reproduced from the first recording medium A second recording step of recording the digital content received in the receiving step on a second recording medium; When the copy control information indicates that the copy control information is copyable for one generation, and the copy control mode information indicates that the digital content is the content for which the number restriction copy is permitted, and A digital copy which can be copied and which can be generated from the recorded digital content by recording the received digital content on the first recording medium when the copy control mode information is not attached to the digital content The first state in which the recorded digital content is reproduced and output as one generation copy enabled, and the copy control information allows one generation copy, and the copy is managed When the control mode information indicates that the digital content is content that permits number-limited copying, and The second recording medium does not correspond to the recording of the content for which the number restriction copy is possible, when the copy control information is copyable for one generation, and the copy control mode information is not attached to the digital content. At the same time, a second state in which the received digital content is recorded on the second recording medium as recopy inhibition, the copy control information is for one generation copy, and the copy control mode information is the digital content A third state in which the received digital content is recorded as the recopy prohibition on the first recording medium when the content does not indicate that the content is copy-restricted content, and the copy control information is not restricted. It is possible to copy, and when the output protection information indicates that output protection is to be performed, the received digital The fourth state in which the first content medium is encrypted and recorded as copyable without restriction conditions, and the copy control information can be copied without restriction conditions, and the output protection information is output. And a fifth state in which the received digital content is recorded as copy-enabled without restriction on the first recording medium without being encrypted when it is indicated that protection is not performed. Do.

According to the above means, for example, it is possible to enhance the convenience of the user in the dubbing operation.

It is a block diagram showing an example of composition of a system. FIG. 2 is a block diagram showing an exemplary configuration of a transmission device 1; It is an example of the structure of the content utilization descriptor which is one of the copy control information. It is an example of description to each field of the content usage descriptor. It is an example of the structure of the digital copy control descriptor which is one of the copy control information. It is an example of the information which controls copy generation. It is an example of the reception process in the receiver 3 of each field of the content utilization descriptor sent from the transmitter 1. The transmission device 1 is an operation example of protection of program content by using copy control information. It is an example of control in case the receiver 3 accumulates (records) program contents using copy control information. FIG. 2 is a block diagram showing a configuration example of a recording apparatus 10. FIG. 6 is a block diagram showing an exemplary configuration of a recording and reproduction control unit 104. It is a schematic diagram which shows the structural example of the information of a removable recording medium. It is a schematic diagram which shows the structural example of the information of a removable recording medium. It is a schematic diagram which shows an example of management of the recorded copy control information. FIG. 6 is a schematic view of a recording medium when performing a copy operation. FIG. 6 is a schematic view of a recording medium when performing a move operation. It is an example of the dubbing menu of a recording device. It is an example of the warning message at the time of copy operation. It is a modification of the dubbing menu of a recording device. It is an example of a display at the time of move operation of the dubbing menu of a recording device. It is an example of the warning message at the time of move operation. It is an example of the dubbing menu of a recording device. It is an example of the judgment flow at the time of dubbing type setting menu display. FIG. 7 is a schematic view of a plurality of content copies when the copy destination recording medium supports a plurality of copies. FIG. 17 is a schematic view of a plurality of content copies when the copy destination recording medium does not correspond to a plurality of copies. It is an example of the video recording program list of a recording device.

Hereinafter, examples (examples) of embodiments suitable for the present invention will be described. However, the present invention is not limited to this embodiment. For example, although the present embodiment describes the recording apparatus and is suitable for implementation in the recording apparatus, it does not prevent the application to other than the recording apparatus. Further, not all the configurations of the embodiment need to be adopted, and they can be selected.

<System>
FIG. 1 is a block diagram showing a configuration example of a system according to the present embodiment. The case of transmitting and receiving information by broadcast and recording and reproducing is illustrated. However, the present invention is not limited to broadcasting and may be VOD by communication, and is also collectively referred to as distribution.

1 is a transmitter installed in an information providing station such as a broadcast station, 2 is a relay installed in a relay station or a satellite for broadcasting, 3 installed in a user's house etc. 3 is a receiver, 10 is a receiver 3 Is a reception recording and reproduction unit incorporated in The reception recording and reproduction unit 10 can record and reproduce the broadcasted information.

The transmitter 1 transmits the modulated signal radio wave via the relay device 2. For example, transmission by cable, transmission by telephone line, transmission by terrestrial broadcasting, or the like can be used. The signal radio wave received by the receiver 3 is demodulated into an information signal as described later, and then recorded as a signal suitable for recording as needed. In addition, when a display is built in the receiver 3, the user connects the receiver 3 and a display (not shown) to view the video and audio indicated by the information signal. Can.

<Transmitter>
FIG. 2 is a block diagram showing a configuration example of the transmission device 1 in the system of FIG.

Reference numeral 11 denotes a source generation unit, 12 an encoding unit which performs compression in accordance with the MPEG system or the like, 13 a scramble unit, 14 a modulation unit, 15 a transmission antenna, and 16 a management information adding unit. camera,
Information such as video and audio generated by the source generation unit 11 including a recording device is compressed in data amount by the encoding unit 12 so that it can be transmitted in a smaller occupied band. As necessary, the scrambler 13 performs transmission encryption so as to be viewable to a specific viewer. After being modulated by the modulation unit 14 so as to be a signal suitable for transmission, the signal is transmitted as a radio wave from the transmission antenna 15 to the relay device 2. At this time, the management information adding unit 16 adds information such as copy control information which is information for controlling copying and the current time.

A plurality of pieces of information are often multiplexed in one radio wave by a method such as time division or spectrum spreading. Although not shown in FIG. 2 for the sake of simplicity, in this case, there are a plurality of streams of the source generation unit 11 and the encoding unit 12, and multiplexing is performed to multiplex a plurality of pieces of information between the encoding unit 12 and the scrambling unit 13. Section (multiplexing section) is placed.

<Copy control information>
The copy control information is information for controlling restrictions such as the possibility of copying and the number of times, and is added by, for example, the management information adding unit 16. It includes content usage descriptor and digital copy control descriptor.

FIG. 8 shows an example of operation regarding protection of program content by using copy control information.

"Operation available" indicates that the transmission side can select the content corresponding to each service type as the generation restriction using digital copy control information. For example, “pay-per-view” indicates that any digital copy control information may be used, and “pay-per-month pay etc.” indicates “copy prohibited” on the transmitting side. Indicates that it can not be selected.

"Flat / tier" refers to flat subscriptions for multiple channels in paid broadcasts as flat subscriptions, and subscriptions for each channel as tier subscriptions.

“Other than the above” includes, for example, “in the case of a program not accompanied by content protection, not pay broadcasting”.

FIG. 3 shows an example of the structure of a content usage descriptor which is one of copy control information. The content usage descriptor is generated and added by, for example, the management information adding unit 16, and the content of the MPEG-TS P is
It is information that is stored and sent out in SI (Program Specific Information) (as one example, PMT (Program Map Table) or the like) or SI (Service Information).

The usage of the content usage descriptor is arranged (sent) when the control information related to storage (recording) or output is described for the program. The meaning is digital_recording_
When the 1-bit field of control_mode (digital copy mode bit) is "1"
It shows that even if digital_recording_control_data of the digital copy control descriptor described in FIG. 5 is “copy permitted for one generation”, it can be recorded as “copy limited for number limit”. "0"
In the case of, it can not be recorded as "number limited copy available".

The content usage descriptor is always placed (sent) when the program is subject to output protection. This output protection is the output protection bit of the content usage descriptor (encryption_mod
Using e) is meant to implement protection for the high speed digital interface output of the "copy free without constraints" content. In other words, although encryption is performed when outputting on a digital interface or copying to a recording medium, the number of copies and generation are not limited. Retransmission to the Internet is virtually impossible. It is also called "copy free with output protection" or EPN (encryption plus non-assertion).

In addition, when the digital copy control information of the program is "copying of one generation is possible" and is not a target of "copy with limited number of copies", it is always arranged (sent).

  FIG. 4 shows an example of the description content of each field of the content usage descriptor.

In "descriptor_tag" is described "0xDE" which means a content usage descriptor. 'Desc
In riptor_length, the descriptor length of the content usage descriptor is described. 'Digital_recordi
In the case of “ng_control_mode”, “0” is described when the digital copy control information is “copying of one generation is possible” and is not a target of “the number limit copying is possible”. '1' if the digital copy control information is "one-generation copy permitted" and is "targeted for number limited copy"
Describe

In “encryption_mode”, “0” is described in the case where digital copy control information is “copyable without restriction conditions” and protection is to be performed on high-speed digital interface output.

“Retention_mode” means temporary storage control bit, “di” of digital copy control descriptor
Describe “0” indicating that temporary storage is possible even if “gital_recording_control_data” (digital copy control information) is “copy prohibited”. “Retention_state” means a temporary storage allowance time, and describes “111” indicating that storage for one hour and thirty minutes is possible. "I
mage_constraint_token "," retention_state "and" encryption_mode "are" 1 "by default.

  Each field will be described later with reference to FIG. 7 as processing on the receiving side.

FIG. 5 shows an example of the structure of a digital copy control descriptor which is one of copy control information.
The digital copy control descriptor is generated and added by the management information adding unit 16, for example,
It is information that is stored and transmitted in PSI (such as PMT as an example) or SI of TS.

The digital copy control descriptor represents information for controlling copy generation by a 2-bit field of "digital_recording_control_data" (digital copy control information).

FIG. 6 shows an example of digital copy control information. If the digital copy control information is "00", it indicates that copying is possible without constraints, if it is "01", it means that it is defined by the broadcaster, and if it is "10", one generation of copying In the case of "11", it indicates that copying is prohibited. Note that “copying of one generation is possible” records the received broadcast signal (
This means that the first generation copy can be performed, but after recording, the broadcast signal can not be copied (copied).

The content usage descriptor in FIGS. 3 and 4 is also called copy number restriction information, and the digital copy control information in FIGS. 5 and 6 is also called copy generation restriction information.

The receiving device 3 related to the copy control information described in FIGS.
A detailed example of the process of will be described.

FIG. 7 shows an example of processing for each field of the content usage descriptor in the receiving device 3.

If “descriptor_tag” is “0xDE”, it is determined that the corresponding descriptor is a content usage descriptor. Based on "descriptor_length", it is determined that it is the descriptor length of the content usage descriptor. When “digital_recording_control_mode” is “1”, when the digital copy control information is “one-generation copy permitted”, it is determined that “number-limited copy is possible”. If it is '0',
If the digital copy control information is "one-generation copy permitted", it is determined that "number-limited copy permitted" is not the target. With regard to "image_constraint_token", it is determined that the resolution of the video signal output is not limited regardless of what value is included. With regard to "retention_mode", it is determined that temporary accumulation is possible regardless of what value is included. With regard to “retention_state”, it is determined that the temporary storage allowable time is 1 hour and 30 minutes regardless of what value is included. "En
If the cryption_mode is '1', it is determined that the high speed digital interface output is not protected if the digital copy control information is 'copy without restriction'. If '0', it is determined that the protection is to be applied to the high speed digital interface output when the digital copy control information is “copy without restriction conditions”.

If the content usage descriptor is not placed (sent) for some reason, it is preferable to interpret each field as the following values. digital_recording_control_mode = '1', image
_constraint_token = '1', retention_mode = '0', retention_state = '111', encry
ption_mode = '1'.

FIG. 9 shows an example of control in which the receiving device 3 accumulates (records) program content using copy control information.

For example, when the program content is stored, the content shown in FIG. 9 indicates that the copy control information on the recording medium is "re-reproduced" when the digital_recording_control_data of the digital copy control descriptor is "10" and "one-generation copy is possible". Store as copy prohibited. However, digital_recordin
When g_control_mode is '1', it is accumulated as “number limited copy possible”. Note that digital_recording_cont in the digital copy control descriptor is also used when storing data in the “do not copy again”.
The value of rol_data does not have to be changed.

Also, if digital_recording_control_data of the digital copy control descriptor is '10' and 'one generation copy is possible', multiple copies should not be generated. However, accumulation in the area where the user can not access for backup purpose is excluded. Further, the above limitation is imposed on each broadcast receiving unit, and when there are a plurality of broadcast receiving units, the above limitation is imposed on each broadcast receiving unit.

N number of copies can be generated from the program content stored as "number limited copy allowed" regarding number limited copy allowed. The value of N may conform to, for example, a standard. When a copy is generated via the high speed digital interface output, the copy may be performed if the number of copies to be generated can be determined by using a move function or the like.
For example, it is a case where it can be recognized that the interface is IEEE 1394 and the output destination is a device compliant with the DTCP standard. Note that the generated copy is in the state of "no recopying" or equivalent.

In addition, when reproducing and outputting program content stored as "number limited copy permitted", DTCP (Digital Transmission Content Pro) is used in the high-speed digital interface.
Performs the No More Copies processing specified in tection) and outputs it. The analog video output and the digital audio output can be output as "one generation copy permitted".

When the recording medium is a removable recording medium, there is another limitation in addition to FIG. For digital recording of program content on a removable recording medium, a digital copy control descriptor digital_recording_control_data is '10' and "one generation copy is possible" program in TV, digital recording of data service, or digital recording of audio service. When receiving and recording content, three or more copies of the received content are not permitted even in the first generation (for example, three or more recording media at the same time when receiving and recording a broadcast) Will not record). This value (three or more is exemplified) may be, for example, compliant with the standard. In addition, a plurality of copies of one generation having the same recording format are not generated. However, digital recording to an area where the user can not access for backup purposes is excluded. In addition, it is assumed that the recording restriction to the digital recording medium is imposed for each reception unit of the broadcast, and when there are a plurality of reception units of the broadcast, the restriction is imposed for each reception unit of one broadcast. Receiver is digita
When a recording method not compatible with l_recording_control_mode is installed, the digital copy control descriptor copy_control_type is '01' and digital_recording_control_data is '10'
The program content is digitally recorded in the treatment of “copying of one generation is possible” regardless of the value of digital_recording_control_mode of the content usage descriptor.

<Receiver>
FIG. 10 shows a configuration example of the recording device 100 as an example of the recording device 10 in the receiving device 3.
It may be an apparatus having only one of recording and reproduction functions.

An input terminal 101 receives digital data such as radio waves from the relay device 2. 10
A receiver 2 performs frequency conversion, modulation operation, error correction, and the like on digital data received from the input terminal 101, and separates the multiplexed bit stream in one transponder into packets such as video and audio. A video / audio information processing unit 103 decodes video data and audio data. A recording / reproduction control unit 104 controls recording or reproduction on a recording medium, and an example of a more detailed internal configuration of this module is shown in FIG. Reference numeral 105 denotes a recording medium for recording digital data, such as a hard disk drive. A display control unit 106 generates output data from display data of video / audio data and interfaces (IFs) for various applications. For example, scaling is performed as necessary on the video data processed by the video and audio processing unit 103, and the display data is superimposed on the video data, for example, image data uniquely prepared by the recording apparatus 100 such as an operation interface or a still image. Generate An output terminal 107 transfers the generated data to a display device such as a liquid crystal display panel. Reference numeral 108 denotes a remote control IF when the user performs an operation using the remote control. An input terminal 109 is a light receiving unit for receiving a signal from the remote controller.
An operation unit 110 has, for example, a group of buttons for performing operations such as recording and reproduction, and the user directly controls the recording apparatus 100 by operating the buttons. The remote control IF 108 and the operation unit 110 are generically referred to as an operation unit and an operation input unit. A control unit 111 controls the operation of the recording apparatus 100, and is constituted by, for example, a CPU. Reference numeral 112 denotes a non-volatile memory for recording information. A system bus 113 performs data communication between blocks connected to the control unit 111.

Reference numeral 114 denotes a slot (also referred to as an attachment / detachment part) for enabling attachment of the removable recording medium. 1
A removable recording medium 15 performs recording in the same recording format as the recording medium 105. Reference numeral 116 denotes a switch, which selects which data of the recording medium 105 or the removable recording medium 115 is to be output or which data is to be input to the recording / reproduction control unit 104. Although only one switch is shown in FIG. 10, it is also conceivable to prepare different switches for input and output. Alternatively, a configuration may be considered in which a recording and reproduction control unit is provided for each of the recording medium 105 and the removable recording medium 115. Further, although the slot 114 and the recording medium 115 are described as a single in the drawing, a plurality of each may exist, and a configuration in which data are exchanged between the respective recording media is also conceivable.

  FIG. 11 shows a configuration example of the recording and reproduction control unit 104.

An input / output terminal 201 is connected to the system bus 113 to transmit control signals. 202
The input terminal is an input terminal and receives digital data including video data and audio data to be recorded on a recording medium. A copy control information processing unit 203 analyzes copy control information included in digital data and updates the copy control information as needed. 204 is an encryption unit, for example, the control unit 11
The input digital data is encrypted using, for example, key information transmitted by 1.
A recording control unit 205 issues a command for recording on a recording medium, and performs processing such as transfer of digital data. An output terminal 206 is connected to the recording medium. An input terminal 207 inputs digital data to be reproduced from the recording medium. Reference numeral 208 denotes a reproduction control unit, which issues a command to the recording medium to reproduce desired digital data. A decryption unit 209 decrypts the read encrypted digital data using, for example, key information transmitted from the control unit 111. An output terminal 210 outputs decoded digital data. A system bus 211 is a system bus that performs data communication between blocks connected to the control unit.

When digital data is stored in the recording medium 105, the control unit 111 performs control based on, for example, a digital copy control descriptor and a content usage descriptor included in the digital data. The digital copy control descriptor comprises, for example, a copy control type and digital recording control data, and the content usage descriptor is represented by, for example, a signal comprising an encryption mode and a digital recording control mode. The control unit 111 controls the copy control information processing unit 20 according to the values of these descriptors.
3 instructs update of copy control information of digital data to be stored, and instructs the encryption unit 204 to perform encryption / non-encryption.

The copy control information processed by the copy control information processing unit 203 includes, for example, copy generation management information and copyable number information, and the copy generation management information is, for example, a 2-bit signal as described below. )
01 Can not re-copy after recording (No-more-copies)
10 Recording of only one generation is possible (Copy-one-generation)
00 Copy available (Copy-free)
Designation such as can be considered. It is possible to designate the copyable number information as an integer of 0 or more and to designate how many copies are possible. Further, digital data whose copy generation management information is “copyable” may include data encrypted and output protected and data not encrypted and output protected.

FIG. 12 shows an example of a preferred data configuration of the removable recording medium 115 (eg, removable hard disk). Reference numeral 301 denotes a management area which the user can not access. Confidentiality is maintained by storing key data for encrypting digital data and recording it in the data recording area 302 in the management area. Reference numeral 302 denotes a data recording area where the user can access internal data by a predetermined operation. In 301, key data is recorded. At 302, information reproduction data for discriminating key information corresponding to each data of the data recording area is recorded together with data such as video / audio data and still image data. Copy control information can be collectively recorded in the management area on such a removable recording medium 115.

FIG. 13 shows another example of a preferred data configuration of the recording medium of FIG. This recording medium is a recording medium (also referred to as a security removable medium) capable of performing copy control. The copy control here is management of plural copies (also called copy number management, copy number control, number control copy) and / or copy generation management (also called copy generation management, copy generation control, generation control copy). )including. It has a normal area accessible to the user and a tamper-resistant area not accessible to the user in one recording medium. Confidential information stored in the tamper-resistant area can be accessed if authentication can be confirmed by authentication processing with an apparatus capable of handling this recording medium, so that confidential information can be managed. It has become. The management area 301 in FIG. 12 is the tamper resistant area, and the data recording area 30 is
2 corresponds to the normal area.

In the recording apparatus 100 shown in FIG. 10, the removable recording medium 115 is the one shown in FIGS.
Different from the ones shown above, for example, it is a recording medium in which management information related to copy control and program information may be tampered with illegally, or a recording medium in which copy control can not be performed In the case where the recording medium is not certified, this recording medium 1
When the digital data input from the input terminal 101 is recorded on the F.15 (non-secure recording medium), the control unit 111 causes the copy control information processing unit 203 to transmit copy generation management information to No-more-co.
Pies, copyable number information is recorded as 0.

FIG. 14 shows an example of copy control information 601 held in an area where information concealment is possible when recording is performed on the recording medium 105 or the removable recording medium 115. Reference numeral 602 denotes a program ID indicating one group of digital data. The unit of grouping is, for example, the range from the beginning to the end of the program to be broadcast, and the range in which the copy control information in the same program is the same.
603 shows the date when the program and the copy control information were recorded. Reference numeral 604 denotes address information indicating where the corresponding data is recorded on the recording medium. 605 indicates copy generation management information of the corresponding digital data. 606 indicates the copyable number information of the corresponding digital data.

The dubbing operation of the content will be described with reference to FIGS. 15 and 16. Dubbing refers to both copying of content (content remains at the copy source of content) and move (content does not remain at the copy source of content).

In order to prevent content from being copied to an unauthorized device that does not comply with copy control, authentication is performed between recording media and recording devices before dubbing. In order to perform authentication, for example, certificates (data in which device information and maker information are registered) that each recording medium or device has in the management area are exchanged. This is called an authentication process. After the authentication process, access to each other's management area becomes possible. After authentication proves that each other is not an unauthorized device, exchange information with each other.

FIG. 15 shows an example of copying the content. In this example, an example is shown in which a program B having key data 0002 and copy control information 0002 is copied from a recording medium A to a recording medium B. The recording medium 115, management area 301, and data recording area 302 in the figure are the same as the contents shown in FIG. When copying content, after performing authentication processing between recording media, copy destination (recording medium B) from the data recording area of the copy source (recording medium A) first
Copy to the data storage area of Thereafter, key data and / or copy control information is copied from the copy source management area to the copy destination management area. This makes it possible to reproduce the content (program B) at both the copy source and the copy destination.

FIG. 16 shows an example of moving content. In this example, a program B having key data 0002 and copy control information 0002 is moved from the recording medium A to the recording medium B. The difference between the move process and the copy process is that when key data and / or copy control information is passed, the key data is written to the move destination (recording medium B), and then the content (program of the move source (recording medium A) is sequentially B) Copy control information and key data are deleted. In this case, although the copy source content, copy control information, and key data are deleted, for example, only key data may be deleted. In this way, at the time of move, management is performed so that contents can not be reproduced simultaneously at both the move source and the move destination.

In the present embodiment, a case where the user executes the dubbing operation of the content will be described.

For example, when the user presses a button such as "Recorded program list" on the remote control in order to confirm the content currently recorded on the recording medium, the content list currently recorded on the recording medium as shown in FIG. A recorded program list 2601 to be displayed on the screen is displayed. 260
Reference numeral 2 denotes a recording medium list capable of displaying a recording list, and can be switched. Also 260
A part of the content included in the recording medium selected in 2602 is displayed at 3. From this state, the user performs a predetermined operation using the remote control or the operation unit 110,
Select the content to be dubbed from 2603 and start the dubbing menu (for example, press the "Dubbing" button, press the menu button to activate the menu, select "Dubbing" from the menu), and the dubbing menu is activated. Be done.

Although the remote control is mainly described, it is not limited to the remote control. Further, in the case of displaying a screen in response to an operation, the control input is received by the remote control IF 108 or the operation unit 110 and the control unit 111 is analyzed to cause the display control unit 106 to output the screen.

FIG. 17 shows an example of the dubbing menu. A display screen 1701 is shown, and in this example, the copyable number information of the content to be dubbed selected by the above operation is analyzed as X pieces. Here, X is 1 or more. The menu displays a message example 1702 indicating the number of possible copies of the content, and a dubbing type setting menu 1703 that allows the user to select copy or move. In order to display the copyable number X, for example, the control unit 111 acquires (analyzes) the copyable number of the currently selected content from the recording and reproduction control unit 104, notifies the display control unit 106, and copies Display the possible number X. Also,
When the content is "Copy-free", the display of the X part is "∞", "unli"
It is also conceivable to indicate that the copying operation can be performed without restriction by designating “mited”, “Free” or the like.

When the user operates the remote control, for example, the dubbing type setting menu 1703
When the “Copy” button is selected, a copy destination selection menu 1704 is displayed. For example, a list 1705 of the recording media 115 currently connected to the slot 114 is displayed, and the respective devices or This is a menu allowing the user to select how many contents are to be copied to the recording medium, in this example, the external HDD 1, external HDD 2, SD card, i.Link device as the recording medium connected to the slot 114. Is detected through the slot 114, and the content is copied to the external HDD 1 and to the SD card by the user's operation, for example, the control unit 11
1 is an example set. The user sets the number of copies of the content to each recording medium using a remote control or the like, and then the copy is executed by selecting the "OK" button on the final decision button 1705 on the menu. . Note that even if there is no operation by the remote control or the like, for example, an initial value may be automatically set according to the number of recording media loaded to allow change. The method of copying one content to one recording medium is as described in FIG. 15, and the method of copying a plurality of contents to one recording medium will be described later.

In this way, the user can easily set how many copies are to be made to a plurality of recording media while confirming the copyable number of contents. Further, although this example shows an example in which a plurality of recording media exist, the same operation is possible even in the case of one.

If the total number of copies set by the user in a plurality of recording media (hereinafter referred to as the user-set number of copies) is one greater than the copyable number of contents, a message such as 1801 in FIG. A notice is notified that the original content is to be deleted, and the user is asked to confirm the intention of "execution" or "cancellation". A copy may be made up to the same number as the copyable number, and if the copyable number is exceeded, a message indicating that copying is not possible may be displayed, but if it is 1 larger than the copyable number, copy together with the move This is because +1 dubbing is possible. This eliminates the need for the user to operate the copyable number of copies and the move, respectively. In addition to the message that “The original content is deleted when copying is performed up to the maximum number of copies + 1”, as shown in 1801, the display message is
A message such as “execute X copies and move” may be issued.

If the number of copies set by the user is larger than the copyable number of contents by 2 or more, an error message 1802 indicating that copying is not possible is displayed as shown in FIG. 18B, and the user is prompted to input again. This is because execution is impossible even if the copyable number and the move are combined.

Moreover, in the example of FIG. 17, although the dubbing type setting menu 1703 and the copy destination selection menu 1704 are displayed on the same screen, they are configured by separate screens as shown in (a) and (b) of FIG. May be

FIG. 20 shows an example of a display screen when the user performs a "move" operation. When the “move” button of the dubbing type setting menu 1703 is selected by the user, the move destination selection menu 2001 is displayed. For example, a list 1705 of the recording media 115 currently connected to the slot 114 is displayed in the move destination selection menu 2001, and the move types that can be supported by the respective recording media (corresponding to a plurality of copies and can be moved) A symbol is displayed which can be judged whether it is not compatible with plural copies but can be moved or can not be moved (also called move condition). In this example, ◎ represents a plurality of copies and can be moved, ○ represents a plurality of copies not corresponding but can be moved, and x represents that it is not possible to move. In addition, a symbol description 2002 is displayed on the screen so that the user can easily understand the meaning. Of course, the combination of symbols is not limited to this example, and other symbols may be used, and numbers, letters, etc. may be used.

As a method of determining which move type each recording medium corresponds to, there can be considered a method of acquiring and analyzing information of each recording medium. (For example, the corresponding version of the copy control standard is acquired, and if it is newer than a certain version, multiple copies are supported. Since the authentication of DTCP has been confirmed, the move is OK, etc.)
When the user tries to move a recording medium that supports multiple copies to a recording medium that does not support multiple copies, a message indicated by 2102 in FIG. A warning is given to the effect that multiple copies of the information will be deleted. That is, it is a warning that copying becomes impossible (the number of possible copies is 0) after the move, even if the remaining five copies of the content should have been made.

By these displays, the user can perform the move operation while easily grasping the corresponding conditions of the move destination recording medium.

When the content selected by the user is 0 copyable number or copy-prohibited content, a screen as shown in FIG. 22 is displayed. In FIG. 22, there is no option of “copy” in the dubbing type setting menu 1703, and only the move is selectable.

The above determination process will be described using the process flow of FIG. First, when the content selected by the user is copy prohibited (yes in S1) (specifically, the copy generation information of the content is “No-more-copies”, etc.), the dubbing displayed on the screen Only "Move" is displayed in the type setting menu 1703 (S4), and when the content selected by the user is not copy prohibited (yes in S1) (specifically, the copy generation information of the content is "Copy" In the case of -one-generation "," Copy-free ", etc.), the next determination S2 is performed. If the number of times the target content can be copied is zero (S2: yes), S4 is executed as described above, and only "move" is displayed in the dubbing type setting menu 1703 displayed on the screen. If the copyable number of times for the target content is not 0 (including the case of "Copy-free" (no in S2), "Copy", "Move" in the dubbing type setting menu 1703 displayed on the screen Both are displayed (S3). As a result, the user can easily determine the processing that can be selected from the copy and move of the currently selected content.

A process of copying a plurality of contents simultaneously to one recording medium will be described. Here, it is assumed that P pieces of content are simultaneously copied to one device.

FIG. 24 shows the processing in the case where the device of the copy destination is "a recording medium capable of managing the generation of copy". The configurations of the recording medium A and the recording medium B in the drawing are the same as the recording medium 115 of FIG.
When the copy destination device is a "recording medium that can manage copy generation", one key data and copy control information are transferred after copying one content, but the copyable number of copy control information is P-1) Control is performed so that the number of copy sources that can be copied is P-subtracted. As a specific control method, copy control information (information 0002) in which the number of copyable copies is set to (P-1) may be transferred from the beginning, or the number of copy control information (information 0002) may be 0. After transferring as individual pieces, an operation of increasing the number of copyable information pieces of information 0002 on the recording medium B may be performed (P-1) times. Since these processes depend on the implementation of the security processing module, it does not matter if you choose an implementation that is both convenient. Thereafter, P copies of the copyable number of copy sources are also subtracted. By processing in this manner, the recording capacity of the recording medium to be used is 1/1, while holding the copyable number of times of the copied content equal as compared to simply copying the content for P-1 times. (P-1) It is possible to reduce by a factor of two.

FIG. 25 also shows the processing in the case where the copy destination device is “a recording medium that can not manage copy generation”. If the copy destination device is a "recording medium that can not manage copy generation"
The copy process is simply performed a plurality of times (P times), or the like, so that P content, key information, and copy control information are included.

As described above, it is determined whether the recording medium of the recording destination is “recording medium capable of managing copy generation” or “recording medium not capable of managing copy generation”, and the process is automatically switched.

In addition, even in the case of "a recording medium that can manage copy generation", if there is a reason such as ease of management, simplification of processing, or the need to have multiple content entities, simply copy multiple times. The method may be implemented to hold P content, key information, and copy control information.

DESCRIPTION OF SYMBOLS 1 ... Transmission apparatus 2 ... Relay apparatus 3 ... Reception apparatus 11 ... Source generation part 12 ... Encoding part 13 ... Scrambling part 14 ... Modulation part 15 ... Transmission antenna 16 ... Management information provision part 10
, 100, 1200 ... recording devices 101, 109, 201, 202, 207, 1201 ...
Input terminal 102, 1201 ... Reception unit 103 ... Image and sound signal processing unit 104, 120
3 ... recording and reproduction control unit 105 ... recording medium 106 ... display unit 107, 206, 210, 1
203, 1302 ... output terminal 108 ... remote control interface 110 ... operation unit 11
DESCRIPTION OF SYMBOLS 1 ... Control part 112 ... Non-volatile memory 113 ... System bus 203 ... Copy control information processing part 204 ... Encryption part 205 ... Recording control part 208 ... Reproduction control part 209 ... Decoding part
114 ... slot 115 ... removable recording medium 116, 1204 ... switch

Claims (2)

In a digital content transmitting and receiving system, which transmits digital content from a transmitting device and receives the digital content in a receiving device,
The transmitting device is
A content generation unit that generates the digital content;
Transmitting the digital content generated by the content generation unit and first control information and second control information on copy control of the digital content, or digital content generated by the content generation unit; A transmission unit that transmits one control information without attaching the second control information;
The first control information includes copy control information capable of indicating at least one generation copy enabled status and copy enabled status without constraints in copying of the digital content,
The second control information includes one piece of output protection information indicating whether or not to protect the output of the digital content when the copy control information can be copied without restriction conditions, and the copy control information Copy control mode information indicating whether or not the digital content is a content subject to number-limited copying, when generation copy is possible;
The receiving device is
A receiver for receiving the transmitted digital content;
A first recording and reproducing unit that records the digital content received by the receiving unit on a first recording medium and reproduces the digital content from the first recording medium;
An output unit that outputs digital content reproduced from the first recording medium;
A second recording unit for recording the digital content received by the receiving unit on a second recording medium;
A control unit that controls the receiving unit, the first recording and reproducing unit, the output unit, and the second recording unit;
The control state of the control unit is:
In the case where the copy control information indicates that the one-generation copy is possible, and the copy control mode information indicates that the digital content is the content in which the limited number of copies is permitted, and the copy control information indicates that the one-generation copy is possible. And, if the copy control mode information is not attached to the digital content, the received digital content is recorded on the first recording medium, and the number of digital copies that can be generated from the recorded digital content is Managing the digital content within a predetermined number, reproducing the recorded digital content, and outputting it as one generation copy permitted;
In the case where the copy control information indicates that the one-generation copy is possible, and the copy control mode information indicates that the digital content is the content in which the limited number of copies is permitted, and the copy control information indicates that the one-generation copy is possible. And, when the copy control mode information is not attached to the digital content, the received digital content is not received when the second recording medium does not correspond to the recording of the content with the number restriction copy enabled. A second state of recording as recopy prohibited on the second recording medium;
When the copy control information indicates that one generation copy is possible, and the copy control mode information indicates that the digital content is not a number-limited copy permitted content, the received digital content may be recorded as the first record. A third state of recording as recopy prohibited on the medium;
The received digital content is not restricted to the first recording medium when the copy control information indicates that the copy control information can be copied without restrictions, and the output protection information indicates that protection is performed at the time of output. A fourth state of encrypting and recording as copy permitted;
When the copy control information is copy-free without restriction and the output protection information indicates that protection is not performed at the output, the received digital content is not restricted to the first recording medium. And a fifth state of recording without copying as being copy-enabled, and
Digital content transmission / reception system characterized in that In a digital content transmitting and receiving method, digital content is transmitted from a transmitting device, and the receiving device receives the digital content.
In the transmitter,
A content generation step of generating the digital content;
Transmitting the generated digital content, first control information and second control information on copy control of the digital content, or generating the generated digital content and the first control information; Transmitting without transmitting the second control information,
The first control information includes copy control information capable of indicating at least one generation copy enabled status and copy enabled status without constraints in copying of the digital content,
The second control information includes one piece of output protection information indicating whether or not to protect the output of the digital content when the copy control information can be copied without restriction conditions, and the copy control information Copy control mode information indicating whether or not the digital content is a content subject to number-limited copying, when generation copy is possible;
In the receiver,
Receiving the transmitted digital content;
A first recording and reproducing step of recording the digital content received in the receiving step on a first recording medium and reproducing the digital content from the first recording medium;
Outputting the digital content reproduced from the first recording medium;
Recording the digital content received in the receiving step on a second recording medium;
In the case where the copy control information indicates that the one-generation copy is possible, and the copy control mode information indicates that the digital content is the content in which the limited number of copies is permitted, and the copy control information indicates that the one-generation copy is possible. And, if the copy control mode information is not attached to the digital content, the received digital content is recorded on the first recording medium, and the number of digital copies that can be generated from the recorded digital content is Managing the digital content within a predetermined number, reproducing the recorded digital content, and outputting it as one generation copy permitted;
In the case where the copy control information indicates that the one-generation copy is possible, and the copy control mode information indicates that the digital content is the content in which the limited number of copies is permitted, and the copy control information indicates that the one-generation copy is possible. And, when the copy control mode information is not attached to the digital content, the received digital content is not received when the second recording medium does not correspond to the recording of the content with the number restriction copy enabled. A second state of recording as recopy prohibited on the second recording medium;
When the copy control information indicates that one generation copy is possible, and the copy control mode information indicates that the digital content is not a number-limited copy permitted content, the received digital content may be recorded as the first record. A third state of recording as recopy prohibited on the medium;
The received digital content is not restricted to the first recording medium when the copy control information indicates that the copy control information can be copied without restrictions, and the output protection information indicates that protection is performed at the time of output. A fourth state of encrypting and recording as copy permitted;
When the copy control information is copy-free without restriction and the output protection information indicates that protection is not performed at the output, the received digital content is not restricted to the first recording medium. And a fifth state of recording without copying as being copy-enabled, and
A digital content transmission / reception method characterized in that