JP2004335024A - Device for transmitting/receiving contents data and system for transmitting contents data - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a system for transmitting contents data, capable of providing high-level copyright protection stronger than conventional without adding another interfaces. <P>SOLUTION: This system is provided with a contents data transmission device 1 for transmitting the attribute data indicating the attributes of the contents data constituted of audio data and license data making a pair with the audio data by superimposing it on the audio data, and transmitting the license data making the pair with the audio data through a digital data output part 1a to the outside, and a contents data receiving device 11 for receiving the transmitted contents data through a digital data input part 11a, and using the audio data according to the contents of the attribute data contained in the contents data. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
INDUSTRIAL APPLICABILITY The present invention is applicable to, for example, a digital audio device that transmits and receives copyright-protected digital audio data via a digital audio signal input / output terminal, and is suitable for a content data transmitting device, a content data receiving device, and a content. It relates to a data transmission system.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as interface standards between devices for inputting and outputting digital audio signals, consumer digital audio devices such as CD (Compact Disc) playback devices, MD (Mini Disc) playback devices, and DAT (Digital Audio Tape) have been used. There are standards such as S / PDIF (Sony Philips Digital Interface) and AES / EBU (the Audio Engineering Society / European Broadcasting Union) which are widely adopted. A coaxial cable or an optical fiber is used for the connection between the devices, and since the audio signals are transmitted and received as they are digitally, there is an advantage that the sound quality does not deteriorate due to the transfer between the devices.
[0003]
However, in recent years, there has been a problem of copyright infringement due to illegal duplication (copying) of digital contents composed of the above digital audio signals. Therefore, in order to address this problem, it has been considered to add information for copy control to digital content, and to prevent illegal duplication by using this additional information.
[0004]
As an example of a control method for preventing this duplication, for example, an SCMS (Serial Copy Management System) method has been put into practical use. The SCMS system is a serial copy control system that enables a digital copy only once by a copy control signal including a copy prohibition / permission flag and a category code transmitted together with a digital audio signal. The digital audio signal of the first eye can be copied, but the copied digital audio signal cannot be further copied, so that generation limit control of the duplication of the digital audio signal can be performed (for example, And Patent Document 1.).
[0005]
[Patent Document 1]
JP 2000-339851 A
[Problems to be solved by the invention]
However, in the SCMS method, there is a problem that only copy control is performed, and it is difficult to perform more advanced copyright protection.
[0007]
On the other hand, there is a method of transmitting content protected by copyright, which is more advanced than the SCMS method, by using an interface such as USB (Universal Serial Bus) or IEEE1394. However, when these methods are adopted, development of a corresponding digital audio device requires development cost and production cost for a new interface. In addition, the addition of a new interface is confusing to the user, and is inconvenient to use, such as learning how to use and easy dedicated cables. Furthermore, since these interfaces are limited to the devices used, they may be installed together with conventional general interfaces on one device, which is disadvantageous in weight reduction and product design. Problem.
[0008]
In view of such a point, the present invention proposes a content data transmitting device, a content data receiving device, and a content data transmitting system that enable stronger and higher copyright protection than conventional ones without adding a new interface. The purpose is to do.
[0009]
[Means for Solving the Problems]
The digital data transmission device of the present invention includes a content data storage unit that stores audio data and license data necessary for using the audio data, and audio data and license data that is paired with the audio data. A content data transmitting unit that transmits attribute data representing the attribute of the content data to the audio data in a superimposed manner, and a license data paired with the audio data; and the attribute data from the content data transmitting unit is superimposed. And a content data output unit for outputting the audio data and license data to the outside.
[0010]
In addition, the digital data receiving apparatus of the present invention receives audio data and / or license data, which are composed of audio data and license data that is a pair of the audio data, on which attribute data representing the attribute of the content data is superimposed. A content data input unit, a content data receiving unit for receiving audio data on which attribute data is superimposed, and / or license data via the content data input unit, and converting the received content data to audio data and the license. A license data analysis unit that analyzes the contents of the license data; and an audio data use unit that uses the audio data in accordance with the analyzed contents of the license data.
[0011]
Further, the digital data transmission system of the present invention superimposes attribute data representing attribute of content data, which is composed of audio data and license data paired with the audio data, on the audio data, and transmits the audio data. And a content data transmitting device that transmits license data to the outside via a digital data output unit, and an attribute included in the received content data via a digital data input unit. The content data receiving device uses audio data according to the content of the data.
[0012]
According to the above configuration, the attribute data representing the attribute of the audio data and the content data composed of the license data paired with the audio data is transmitted by being superimposed on the audio data. In the receiving device that transmits the license data paired with the content data and receives the content data, audio data is used in accordance with the content of the attribute data included in the content data. Sends and receives audio data and license data required to use this audio data via the output unit, using a conventional interface without adding a new interface Copyright protection can be realized .
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
1 to 3, a digital audio signal (hereinafter, also referred to as audio data) as an example of an embodiment of a content data transmitting device, a content data receiving device, and a content data transmission system of the present invention. For example, as an interface standard between devices for inputting / outputting S / PDIF terminals, audio / video devices equipped with an S / PDIF terminal, which are widely used in consumer digital audio devices such as CD players, MD players, and DATs. Now, a case where content data is transmitted and received will be described.
[0014]
Examples of transmitting and receiving content data include, for example, a case where audio data recorded on an MD using an MD playback device is transmitted to another device via an S / PDIF terminal, and a case where the S / PDIF standard for an MD playback device is used. Various cases can be considered, such as listening to music by connecting headphones to the headphone terminal.
[0015]
FIG. 1 shows a content data transmission system for transmitting and receiving audio data via, for example, an S / PDIF terminal as an input / output terminal for digital audio data. Reference numeral 1 denotes a content data transmission device (hereinafter, referred to as a transmission device). ) And 11 are content data receiving devices (hereinafter, referred to as receiving devices).
[0016]
The transmitting device 1 and the receiving device 11 represent an audio data producing / supplying device and a reproducing device, respectively, and a content data output portion 1a and a content data input portion 11a each having an S / PDIF terminal are connected by an S / PDIF cable 10. Thus, it is configured to be able to transmit and receive data.
[0017]
The content data transmission device 1 includes a content data storage unit 2, a content data transmission unit 3, a license data addition processing unit 4, and a content data output unit 1a. The content data storage unit 2 stores content data including audio data and license data including license information necessary for using the audio data for protecting the copyright of the audio data. .
[0018]
The audio data in this example is data to be played back as music, and is protected by copyright using an encryption technique or the like. In addition, the license data is information necessary for decrypting encrypted content data such as audio data, and for the use of content data, for example, a playback time limit, the number of playbacks, and how many times the device has transmitted from an own device to an external device. And information indicating some restriction such as the number of checkouts indicating the number of checkouts. Note that the content data storage unit 3 may be of various types such as a recording medium such as a CD, MD, DAT, or DVD (Digital Versatile Disc), or a recording device such as an HDD (Hard Disk Drive).
[0019]
The content data transmitting section 3 outputs the audio data and / or license data necessary for using the audio data stored and stored in the content data storage section 2 to the content data output section 1a. It is assumed that a content data using device that needs to transmit content data to another content data using device has a content data transmitting unit.
[0020]
The content data use device has an interface for transmitting and receiving audio data such as S / PDIF, and has both a license data analysis unit and a content data use unit as described later. Then, it is assumed that either the content data transmitting unit or the content data receiving unit is provided, or both of them are provided.
[0021]
When the audio data and / or the license data to be paired are output to the content data output unit 1a, the license data addition processing unit 4 including a control device such as a microprocessor, for example, issues an instruction from a user via an operation unit. Based on the above, audio data and license data to be paired are selected, and the presence / absence of license data, the presence / absence of information in the audio data, or the content data to which the conventional copy control data corresponding to the license data absence is added The attribute data, which will be described later, indicating whether or not the attribute data is included is superimposed on the audio data.
[0022]
The content data output unit 1a transmits content data including audio data and / or license data on which attribute data is superimposed to the reception device 11 via the data transmission unit 10 including an S / PDIF cable or the like.
[0023]
The receiving device 11 includes a content data input unit 11a, a content data analysis unit 13, a license data analysis unit 14, and an audio data use unit 15. The content data transmitted from the transmission device 1 is input to the content data receiving unit 12 via the content data input unit 11a.
[0024]
The content data input to the content data receiving unit 12 is divided into license data and audio data in a content data analyzing unit 13, the license data is sent to a license data analyzing unit 14, the audio data is sent to an audio data using unit 15, Each is entered. It is assumed that a content data using device that needs to receive content data from another content data using device has a content data receiving unit.
[0025]
The license data analysis unit 14 has a function of analyzing the content of the input license data. Then, the analyzed information is notified to the audio data using unit 15 as information necessary for using the audio data.
[0026]
The audio data use unit 15 has a function of using audio data, such as decryption of encrypted audio data input from the license data analysis unit 14 and reproduction of audio data. The audio data using unit 15 may be realized by software or hardware as long as it satisfies the function of using audio data.
[0027]
Here, the data format of the content data transmitted from the transmission device 1 to the reception device 11 will be described. In this example, audio data and license data necessary for using the audio data are transmitted as content data from the content data transmitting unit 3 to the receiving device via the content data output unit 1a and the transmission unit 10. At this time, the following two patterns can be considered as a method of transmitting license data.
-When license data and audio data are transmitted simultaneously.
-When license data and audio data are transmitted separately.
[0028]
Therefore, the transmitting side and the receiving side must be able to identify whether the transmitted content data is license data, audio data, or whether both are transmitted simultaneously. In this example, information indicating the attribute of the content data is transmitted while being superimposed on the audio data.
[0029]
FIG. 2 shows a data format of audio data that can be transmitted and received via the S / PDIF terminal, which is the content data output unit 1a and the content data input unit 11a of this example. In the conventional content data transmission via the S / PDIF terminal, the reserved area of the channel status bit whose use purpose can be arbitrarily determined by the content data distributor has not been used, but in this example, this reserved area is used as the data area. Used as bits to indicate attributes.
[0030]
Audio data that can be transmitted / received at the S / PDIF terminal is composed of 31 bits, and audio data 21 from 0 to 29 bits contains audio information such as music. The copy control signal 21a according to the conventional SCMS method performs copy control depending on, for example, the presence or absence of the second bit flag of the audio data 21. In this example, the data format of the conventional system is also effective.
[0031]
Reference numeral 22 denotes a data area indicating an attribute of content data composed of audio data and / or license data. In this example, a reserved area for data that can be transmitted and received according to the S / PDIF standard is used. The attribute of the content data is indicated by the presence or absence of the flag of the bit 22a of the 30th bit and the bit 22b of the 31st bit.
[0032]
For example, the 31st and 32nd bits of the data format are
In the case of 00, in the case of the license data non-correspondence content data 01, in the case of 10, including only the license data, in the case of 11, including only the audio data, and in the case of 11, including both the license data and the audio data.
[0033]
When the bits 22a and 22b indicating the attribute of the content data to be transmitted indicate only one of the license data and the audio data, such as 01 and 10, the corresponding license data or audio data is separately received from the transmission side. Is transmitted to the side. The order in this case does not matter.
[0034]
Further, in this example, when the copy control signal 21a and the flag of the bits 22a and 22b representing the attribute of the data coexist, that is, when the conventional method and the method of this example are mixed in the content data, the copy of the conventional method is performed. The control information is given a lower priority than the copyright information indicated by the license data of this example.
[0035]
FIG. 3 is a flowchart for explaining the present example. With reference to FIG. 3, the operation of the content transmission system of the present example will be described.
[0036]
First, a user inputs and operates a user interface (hereinafter, referred to as a UI) (not shown) provided in the transmission device 1 to select a desired music stored in the content data storage unit 2. A case where the content data is transmitted to the receiving device 11 will be considered.
[0037]
The receiving device 11 receives the content data transmitted from the transmitting device 1 by the content data receiving device 12 via the transmission unit 10 and the content data input unit 11a, and inputs the content data to the content data analyzing unit 13 (step S1). ).
[0038]
First, the content data analysis unit 13 checks whether or not the flag relating to the attribute information indicating the content of transmission of the content data indicated in the reserved areas 14a and 14b is 00 (step S2). If the flag is not 00, it is checked whether the flag is 01 (step S3).
[0039]
If the flag is neither 00 nor 01, it is checked whether or not the flag is 10 (step S4). Further, when the flag is not 10, that is, when the flag is 11, data including license data and audio data has been transmitted from the transmitting device 1 to the receiving device 11, and the content data analysis is performed. The unit 13 inputs each data to the license data analysis unit 14 and the audio data use unit 15.
[0040]
The license data analysis unit 14 analyzes the input license data and notifies the analyzed license information to the audio data use unit 15 (step S5).
[0041]
The audio data using unit 15 performs content processing (step S6) such as decoding or reproducing audio data in accordance with the content of the notified license, and performs audio processing (step S6). Data is available.
[0042]
In the process of step S3, if the flags of the reserved areas 14a and 14b are 01, since only the license data is transmitted from the transmitting device 1, the content data analyzing unit 13 transmits the paired audio data. Wait for coming (step S7). Then, audio data corresponding to the license data is received (step S8). When the license data and the corresponding audio data are completed, the respective data is input to the license data analysis unit 14 and the audio data use unit 15, and Move to step S5.
[0043]
The license data analysis unit 14 analyzes the input license data and notifies the audio data use unit 15 of the analyzed license information. The audio data use unit 15 performs content processing such as decoding or reproducing the audio data according to the content of the notified license, and processes the audio data input from the content data analysis unit 13. use.
[0044]
Also, in the process of step S4, if the flags of the reserved areas 14a and 14b are neither 00 nor 01 and are 10, since only the audio data has been transmitted, the process proceeds to step S7 in the same manner as described above. And waits for license data to be transmitted. Then, when the corresponding license data is received and the audio data and the corresponding license data are completed, the respective data is input to the license data analysis unit 14 and the audio data use unit 15, and the process proceeds to step S5.
[0045]
The license data analysis unit 14 analyzes the input license data and notifies the audio data use unit 15 of the analyzed license information. The audio data use unit 15 performs content processing such as decoding or reproducing the audio data according to the content of the notified license, and processes the audio data input from the content data analysis unit 13. Can be used.
[0046]
Thus, even if the transmitting device 1 takes in the content data stored in the content data storage unit 2 through the transmitting means 10 into the receiving device 11 and attempts to reproduce or record audio data, a corresponding license is required. If there is no data, it cannot be used, or the method of use, the number of times of use, and the like are limited, so that the copyright of the audio data can be strongly protected.
[0047]
If the flag is 00 in the process of step S2, the copyright protection process of the related art corresponding to the license data rejection, that is, the audio data to which the copy control signal is added is transmitted to the receiving device 11. If the conventional method is the SCMS method, an SCMS analysis process is performed (step S9).
[0048]
In this case, since there is no license data, the process proceeds to step S6, in which the audio data is input to the audio data use unit 15, and the content processing such as decoding the audio data or reproducing the audio data is performed. Can use audio data. The above-described SCMS analysis processing function may be provided not in the content data analysis unit 13 but in the audio data use unit 15.
[0049]
With the above configuration, it is possible to introduce a more robust copyright protection scheme such as the SCMS scheme using the existing interface, for example, the S / PDIF terminal, without adding a new interface. it can.
[0050]
Also, audio data and license data necessary for using the audio data can be transmitted together as content data.
[0051]
Further, since there is no need to develop and add an interface, development and production costs can be reduced.
[0052]
Further, since it is not necessary to add a new interface, it is possible to reduce a user's burden of learning how to use the new interface.
[0053]
Further, since no new interface is added, there is no need to prepare a dedicated cable for the interface, and the economic burden on the user can be reduced.
[0054]
In addition, since copyright can be protected without adding a new interface, compatibility with digital audio equipment having only a conventional interface, such as an S / PDIF terminal, can be easily realized. it can.
[0055]
In addition, since the number of interfaces does not increase, the design can be easily maintained, and an increase in the weight of the device can be suppressed.
[0056]
It should be noted that the present invention is not limited to the above-described embodiment, and for example, the function of the transmitting device and the function of the receiving device may be mounted in one device.
[0057]
Further, the present invention is not limited to the above-described embodiment, and it goes without saying that various other configurations can be adopted without departing from the gist of the present invention.
[0058]
【The invention's effect】
According to the present invention, the audio data and the attribute data representing the attribute of the content data composed of the license data paired with the audio data are superimposed on the audio data and transmitted. In the receiving device that transmits the license data to be paired and receives the content data, audio data is used in accordance with the content of the attribute data included in the content data. Unit, and sends and receives audio data and license data necessary to use this audio data. Using a conventional interface without adding a new interface, Copyright protection can be achieved.
[Brief description of the drawings]
FIG. 1 is a configuration diagram illustrating a content data transmission system according to an embodiment of the present invention;
FIG. 2 is a diagram showing a data format of an example of an embodiment of the present invention.
FIG. 3 is a flowchart for explaining an example of an embodiment of the present invention;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Transmission device, 1a ... Content data output part, 2 ... Content data storage part, 3 ... Content data transmission part, 4 ... License data addition processing part, 10 ... Transmission means, 11 ... Receiving device, 11a ... Content data input part , 12 ... Content data receiving unit, 13 ... Content data analyzing unit, 14 ... License data analyzing unit, 15 ... Audio data using unit, 21 ... Audio data (audio information), 21a ... Copy control signal, 22 ... Data attribute Areas to represent, 22a, 22b... Bits representing data attributes

Claims (11)

A content data storage unit that stores audio data and license data necessary for using the audio data,
Attribute data representing the attribute of the content data, which is composed of the audio data and the license data paired with the audio data, is transmitted by being superimposed on the audio data, and the license data paired with the audio data is transmitted. A content data transmitting unit to perform
A content data transmission device comprising: a content data output unit that outputs audio data on which the attribute data is superimposed and the license data from the content data transmission unit to the outside. The content data transmitting device according to claim 1,
A content data transmitting apparatus, wherein copy control data is added to the content data. The content data transmitting device according to claim 1,
The attribute data is such that the content data is any one of audio data to which copy control data is added, data of license data only, data of audio data only, and data including audio data and license data. A content data transmission device characterized in that: A content data input unit configured to include audio data and license data that is a pair of the audio data, audio data on which attribute data representing an attribute of the content data is superimposed, and / or license data input;
A content data receiving unit that receives, via the content data input unit, audio data on which the attribute data is superimposed and / or the license data;
A content data analysis unit that divides the received content data into the audio data and the license data,
A license data analysis unit for analyzing the contents of the license data,
An audio data use unit that uses the audio data in accordance with the analyzed content of the license data. The content data receiving device according to claim 4,
When the attribute data indicates that the content data is content data to which copy control data is added,
The content data receiving device, wherein the audio data using unit uses audio data based on the conventional copyright protection processing. The content data receiving device according to claim 4,
When the attribute data indicates that the content data consists only of audio data or only license data,
The audio data use unit, after receiving the license data forming the pair of the audio data or the audio data forming the pair of the license data, uses the paired audio data according to the content of each license data. Content data receiving device. The content data receiving device according to claim 4,
When the attribute data indicates that the content data includes audio data, and a pair of license data,
The content data receiving device, wherein the audio data using unit uses the paired audio data according to the content of the license data. Attribute data representing the attribute of the content data, which is composed of audio data and license data paired with the audio data, is transmitted by being superimposed on the audio data, and the license data paired with the audio data is digitally transmitted. A content data transmission device for transmitting to the outside via a data output unit,
A content data receiving device that receives the transmitted content data via a digital data input unit and uses the audio data according to the content of the attribute data included in the content data. Characteristic content data transmission system. The content data transmission system according to claim 8,
A content data transmission system, wherein copy control data is added to the content data. The content data transmission system according to claim 8,
As the content data transmission device, a content data storage unit that stores audio data and license data necessary to use the audio data,
A content data transmitting unit that transmits the attribute data superimposed on the audio data and transmits license data that is paired with the audio data;
A content data transmission system, comprising: a content data output unit that outputs audio data on which the attribute data is superimposed from the content data transmission unit and the license data. The content data transmission system according to claim 8,
A content data input unit into which the audio data on which the attribute data is superimposed and / or the license data are input;
A content data receiving unit that receives audio data on which the attribute data is superimposed and / or the license data via the content data input unit;
A content data analysis unit that divides the received content data into the audio data and the license data,
A license data analysis unit for analyzing the contents of the license data,
A content data transmission system comprising: an audio data use unit that uses the audio data according to the analyzed content of the license data.

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