JP2003309549A - Contents reproduction unit, contents reproduction method, program and recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide contents reproduction unit, contents reproduction method, program and recording medium, capable of providing through a network a premium contents related to a radiowave broadcast program, only to the viewers having viewed the program concerned. <P>SOLUTION: Radiowave broadcast or wired broadcast including a contents decryption key is received, and the contents decryption key is extracted from the information obtained by receiving the broadcast, and retained. Predetermined encrypted contents are acquired through the network, and are decrypted using the retained contents decryption key. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a content reproducing apparatus and the like, and more particularly to a content reproducing apparatus, a content reproducing method, a program and a recording medium for reproducing encrypted content.

[0002]

2. Description of the Related Art Conventionally, when a viewer views a specific pay broadcast program, in the first conventional example, the viewer receives specific information (premium content) via a network.
Can be provided. The specific information is, for example, a wallpaper file of an actor who appears in the pay broadcast program that is being watched, and by the telop during the program broadcast,
Notice that there is a wallpaper download service is displayed. In this case, the telop includes the URL of the encrypted content and the password (key information) for decrypting the code, and the user who has viewed the program accesses the URL on the PC and obtains the encrypted wallpaper. Then, the password is used to unlock the encryption.

That is, in the above-mentioned first conventional example, the viewer who is provided with the privilege needs to input the notified password from the computer.

On the other hand, there is known a second conventional example in which a decryption key and an encrypted content are divided between broadcasting and a network. In the second conventional example, a network with high security by unicast such as Internet HTTP communication is used to transmit a decryption key with a small amount of information, and encrypted content that is not confidential information is transmitted by broadcasting with excellent broadcastability. To do.

[0005]

However, in the first prior art example described above, in the case where a service for providing premium content relating to a program from a network is provided only to a viewer who has watched a radio wave broadcast, a pay broadcast is used. Since the password is displayed as a telop while the program is being broadcast,
There is a problem that the password is known to people other than the person who watched the program. In other words, the person watching the program may verbally teach the password to a third party.

That is, in the above-mentioned second conventional example, there is a problem that the service "provide only the viewer who has watched a certain radio wave broadcast, the premium content regarding the program from the network" cannot be executed. is there.

The present invention provides a content reproducing apparatus, a content reproducing method, a program and a recording medium capable of providing a premium content related to a program to a viewer who has watched a certain radio wave broadcast, through a network. It is intended.

[0008]

The present invention receives a radio wave broadcast or a cable broadcast containing a content decryption key, extracts the content decryption key from the information obtained by receiving the broadcast, and extracts the content decryption key. Holds the content decryption key, acquires the predetermined encrypted content via the network,
The acquired encrypted content is decrypted using the retained content decryption key.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram showing a content reproducing apparatus CR1 which is a first embodiment of the present invention.

The content reproduction device CR1 includes a broadcast receiving means 11, a content decryption key extracting means 12, a content decryption key holding means 13, and an encrypted content acquiring means 1
4, the encrypted content decryption unit 15, the content reproduction unit 16, and the content reproduction instruction unit 17.

The broadcast receiving means 11 is means for receiving a radio wave broadcast or a cable broadcast containing a content decryption key, generating a reception signal based on the received radio wave, and outputting the received signal to the content decryption key extracting means 12. Here, the broadcast wave including the content decryption key is pay broadcast such as satellite broadcast. Also, the broadcast receiving means 11 may be configured by an antenna and a tuner.

In the present specification, "broadcast" means video broadcasting by wireless medium by specific multi-cast (such as WOWOW which is pay broadcasting with billing authentication) and video broadcasting by wired medium by special multi-cast (cable TV pay channel). Etc.), video broadcasting by wireless medium by unspecified multicast (terrestrial analog broadcasting, etc.), video broadcasting by wired medium by unspecified multicast (cable TV)
Free channels, etc.).

When acquiring encrypted content via a network, specific unicast (Internet HTTP communication, etc.) by wire or wireless medium, specific majority multicast (IP multicast communication, etc.), unspecified majority multicast (IP broadcast communication, etc.) ) To get the encrypted content.

The content decryption key extraction means 12 receives the received signal output by the broadcast reception means 11, extracts the content decryption key contained in the input received signal, and uses the extracted content decryption key as the content. This is means for outputting to the decryption key holding means 13.

For example, the content decryption key may be extracted from the metadata, service information, etc. generated based on the received signal. The content decryption key is, for example, a scramble key.

The content decryption key holding means 13 inputs the content decryption key output by the content decryption key extraction means 12, retains this input content decryption key, and the encrypted content decryption means 15 makes a request described later. Is a means for outputting the held content decryption key to the encrypted content decrypting means 15. The content decryption key holding unit 13 is a unit including a memory, a hard disk and other recording media.

The encrypted content acquisition means 14 is means for acquiring encrypted content, and is means for outputting the acquired encrypted content to the encrypted content decrypting means 15. The correspondence table between the decryption key and the encrypted content is
It is acquired together with the decryption key from radio wave broadcasting or cable broadcasting.

Here, the encrypted content is distributed via a network such as the Internet, but the encrypted content may be distributed via another electric line. The encrypted content is content that has been processed by the encryption technique and cannot be played back only by receiving it, and is, for example, scrambled content or noise-containing content.

The encrypted content decryption means 15 inputs the content decryption key held by the content decryption key holding means 13 and the encrypted content acquired by the encrypted content acquisition means 14, and decrypts this input content. It is means for decrypting the input encrypted content using a key, decrypting the decrypted content, and outputting the decrypted content to the content reproducing means 16.

As for the content decryption key, the encrypted content decryption means 15 and the content decryption key holding means 13 are the content decryption keys.
Is a decryption key output from the content decryption key holding unit 13 to the encrypted content decryption unit 15 by outputting a predetermined request. Further, for example, the encrypted content acquisition means 14 and the encrypted content decryption means 15
The request may be output to the content decryption key holding means 13 when the encrypted content is output to the.

The content reproducing means 16 is means for inputting the decrypted content output by the encrypted content decrypting means 15 and reproducing the image, video, audio and other information based on the decrypted content. It is configured by a known image reproducing device or the like.

The content reproduction instructing means 17 is means for instructing the content reproducing means 16 to reproduce the content.

Next, the operation of the content reproduction apparatus CR1 will be described.

FIG. 2 is a flowchart showing the operation of the content reproduction apparatus CR1.

The operation when the content reproduction device CR1 receives a broadcast wave will be described below, but the operation when a cable broadcast is received is the same as the following operation.

In step S11, the content decryption key extracting means 12 determines whether or not the content decryption key is included in the broadcast wave received by the broadcast receiving means 11. If it is determined that the content decryption key is not included, the above determination is continuously repeated. If it is determined that the content decryption key is included, the process proceeds to step S12.

In step S12, the content decryption key contained in the received broadcast wave is extracted by the content decryption key extraction means 12, and in step S13, the content decryption key extracted in step S12 is extracted. It is held by the holding means 13.

In step S14, the encrypted content acquisition means 14 determines whether or not there is an instruction to reproduce the content from the outside. If it is determined that there is, the process proceeds to step S15.

In step S15, the encrypted content acquisition means 14 acquires the encrypted content via an electric line such as a network. In step S16, the content decryption key for decrypting the acquired encrypted content is decrypted. The encrypted content decryption means 15 determines whether the content decryption key storage means 13 holds the content decryption key.

If it is determined in step S16 that the content decryption key for decrypting the acquired encrypted content is not held in the content decryption key holding means 13, the process returns to step S11 and the content decryption key is held. If it is determined that there is, the process proceeds to step S17.

In step S17, the encrypted content decryption means 15 decrypts the acquired encrypted content by using the content decryption key held in the content decryption key holding means 13, and in step S18, in step S18.
Based on the content decrypted in 17, images, video,
The content reproducing means 16 reproduces the voice and other information.

Further, the program constructed by the above steps S11 to S18 in the first embodiment is
The content is stored in a memory (not shown) provided in the content reproduction device CR1, and the above-described operation is executed by the stored program.

According to the first embodiment described above, the content decryption key included in the received broadcast wave is used as the content decryption key for the encrypted content via the network, so that viewing and listening to a predetermined radio wave broadcast is performed. It is possible to provide the premium content related to the program only to the person via the network.

Further, according to the first embodiment, since the network is used, it is easy to update and distribute the program.

In the first embodiment, the program is stored in advance in the memory of the content reproduction apparatus CR1, but instead of this, the program is recorded in a predetermined recording medium in advance, and The program recorded in a recording medium may be loaded, or the program may be acquired via a communication interface or a network and the acquired program may be executed by the computer. .

The content reproducing device CR1 may be configured by a computer device having a general structure including an interface, an arithmetic and control unit, a storage device and the like.

FIG. 3 is a block diagram showing a content reproducing apparatus CR2 which is a second embodiment of the present invention.

The content reproduction device CR2 is a device to which the content storage means 21 and the switching means 22 are added in the content reproduction device CR1.

That is, the content reproduction apparatus CR2 includes the broadcast receiving means 11, the content decryption key extracting means 12,
Content decryption key holding means 13, encrypted content acquisition means 14, encrypted content decryption means 15, content reproduction means 16, and content reproduction instruction means 17
And a content storage means 21 and a switching means 22.

Among the constituent elements of the content reproducing apparatus CR2, the same constituent elements as those of the content reproducing apparatus CR1 are designated by the same reference numerals, and the description thereof will be omitted.
Also, the correspondence table between the decryption key and the encrypted content is acquired together with the encrypted content via the network.

The encrypted content acquisition means 14 is means for acquiring the encrypted content, and outputs the acquired encrypted content to the content storage means 21 and the switching means 22.

Here, the encrypted content is, for example,
The encrypted content is distributed via a network such as the Internet. Via other electrical lines,
The encrypted content may be transmitted. Also,
The encrypted content is a content that has been processed by an encryption technique and cannot be played back only by receiving it, and is, for example, a scrambled content or a content including noise.

The content storage means 21 stores the encrypted content output by the encrypted content acquisition means 14, and when the switching means 22 selects the content storage means 21, the predetermined encryption stored in the content storage means 21 is stored. It is a means for outputting the encrypted content to the encrypted content decrypting means 15. Here, the content storage unit 21 may output the content designated by the user or the like.

The switching means 22 is a means for selecting either the encrypted content acquisition means 14 or the content storage means 21, and switches the selection by the switching means 22 according to an instruction from the user or an instruction from an external means. .
Therefore, the content from the means selected by the switching means 22 is output to the encrypted content decrypting means 15 to be decrypted and reproduced.

Next, the operation of the content reproduction apparatus CR2 will be described.

FIG. 4 is a flowchart showing the operation of the content reproduction apparatus CR2.

The operation when the content reproduction device CR2 receives a broadcast wave will be described below, but the operation when a cable broadcast is received is the same as the following operation.

Among the operations of the content reproduction device CR2, the same operations as those of the content reproduction device CR1 are designated by the same step S numbers, and the description thereof will be omitted.

Steps S11 to S14 are the same as the operation in the content reproduction device CR1.

In step S21, it is determined whether or not the instruction is to reproduce the encrypted content stored in the content storage means 21.

If the instruction is to reproduce the stored encrypted content, in step S22, the encrypted content decrypting means 15 acquires the encrypted content stored in the content storing means 21, while it is stored. If it is not an instruction to reproduce the encrypted content, in step S23, an electric line such as a network is used.
The encrypted content acquisition means 14 acquires the encrypted content.

The process after acquiring the encrypted contents is
The process is the same as that in the content reproduction device CR1.
Therefore, when the content decryption key corresponding to the acquired encrypted content is held in the content decryption key holding means 13, the encryption is released and the content is reproduced.

Further, the program constituted by the steps S11 to S18 in the second embodiment is
The content is stored in a memory (not shown) provided in the content reproduction device CR2, and the above-described operation is executed by the stored program.

According to the content reproducing apparatus CR2, if the network speed is slow and it takes time to acquire the encrypted content, the encrypted content is acquired and stored in the content storage means 21 prior to the program broadcasting. ,
Even if the network speed is slow, you can browse encrypted content smoothly.

Further, according to the content reproduction apparatus CR2, since the network is used, it is easy to update and distribute the program.

In the second embodiment, the program is stored in advance in the memory of the content reproduction apparatus CR2. Instead of doing this, the program is recorded in a predetermined recording medium in advance, and The program recorded in a recording medium may be loaded, or the program may be acquired via a communication interface or a network and the acquired program may be executed by the computer. .

The content reproducing device CR2 may be configured by a computer device having a general structure including an interface, an arithmetic and control unit, a storage device and the like.

FIG. 5 is a block diagram showing the structure of a content reproducing apparatus CR3 which is the third embodiment of the present invention.

The content reproduction device CR3 is a device in which the viewed content information transmitting means 31 is added to the content reproduction device CR1.

That is, the content reproducing apparatus CR3 includes the broadcast receiving means 11, the content decryption key extracting means 12, and
Content decryption key holding means 13, encrypted content acquisition means 14, encrypted content decryption means 15, content reproduction means 16, and content reproduction instruction means 17
And the viewed content information transmitting means 31.

Among the constituent elements of the content reproducing apparatus CR3, the same constituent elements as those of the content reproducing apparatus CR1 are designated by the same reference numerals, and the description thereof will be omitted.

The encrypted content decryption means 15 inputs the content decryption key output by the content decryption key holding means 13 and the encrypted content output by the encrypted content acquisition means 14, and uses the input content decryption key. Then, the encrypted content is decrypted to generate a decrypted content, the decrypted content is output to the content reproduction means 16, and information about the decrypted content (hereinafter referred to as “viewed content information”). )
Is output to the viewed content information transmitting means 31.

The viewed content information transmitting means 31 sends the viewed content information output from the encrypted content decrypting means 15 to the destination stored in the viewed content information transmitting means 31 via an electric line such as a network. Send.

The viewed content information transmitting means 31
The viewed content information transmitted by is information including information indicating that the content acquired via the network has been reproduced.

In the content reproduction apparatus CR3, the viewed content information transmitting means 31 transmits the viewed content information generated by the encrypted content decrypting means 15, but the viewed content information generated by the content reproducing means 16 is used. The content information is transmitted to the viewed content information transmitting means 31.
May be transmitted.

Next, the operation of the content reproduction apparatus CR3 will be described.

FIG. 6 is a flowchart showing the operation of the content reproduction device CR3.

The operation when the content reproduction device CR3 receives a broadcast wave will be described below, but the operation when a cable broadcast is received is the same as the following operation.

Among the operations of the content reproduction device CR3, the same operations as those of the content reproduction device CR1 are designated by the same step S numbers, and the description thereof will be omitted.

When the content decrypted in step S17 is reproduced in step S18, in step S31, the viewed content information generated by the encrypted content decrypting means 15 is transferred to the viewed content information transmitting means 31.
However, it outputs via an electric line such as a network.

In step S31, the viewed content information generated by the encrypted content decrypting means 15 is changed to
Although the viewed content information transmitting means 31 transmits the viewed content information, the viewed content information generated by the content reproducing means 16 may be transmitted instead.

The content reproducing device CR3 may be configured by a computer device having a general structure including an interface, an arithmetic and control unit, a storage device and the like.

According to the third embodiment, since the encrypted content via the network or the stored encrypted content is decrypted and the reproduced information is transmitted via the network, the content provider acquires the content, It is possible to easily grasp the taste of the user who plays back.

FIG. 7 is a block diagram showing a content reproducing apparatus CR4 which is the fourth embodiment of the present invention.

The content reproduction device CR4 is a device in which the content reproduction devices CR2 and CR3 are combined.

That is, the content reproduction apparatus CR4 includes the broadcast receiving means 11, the content decryption key extracting means 12,
Content decryption key holding means 13, encrypted content acquisition means 14, encrypted content decryption means 15, content reproduction means 16, and content reproduction instruction means 17
The content storage means 21, the switching means 22, and the viewed content information transmission means 31.

Next, the operation of the content reproduction apparatus CR4 will be described.

FIG. 8 is a flow chart showing the operation of the content reproduction apparatus CR4.

The operation of the content reproduction apparatus CR4 is shown in FIG.
Is basically the same as the operation shown in the flowchart of
After step S18, step S31 is added.

In step S31, the viewed content information transmitting means 31 outputs the viewed content information generated by the encrypted content decrypting means 15 via an electric line such as a network.

In step S31, the viewed content information generated by the encrypted content decrypting means 15 is changed to
Although the viewed content information transmitting means 31 transmits the viewed content information, the viewed content information generated by the content reproducing means 16 may be transmitted instead.

The content reproducing device CR4 may be configured by a computer device having a general structure including an interface, an arithmetic and control unit, a storage device and the like.

In each of the above embodiments, the correspondence table between the decryption key and the encrypted content may be received together with the decryption key, and the correspondence table between the decryption key and the encrypted content may be received together with the encrypted content. You may make it receive.

When the correspondence table of the decryption key and the encrypted content is received together with the decryption key, at least the acquisition source of the encrypted content is described, and when the user gives an instruction to browse the encrypted content, the encrypted content is displayed. Get and decrypt the content. When it takes time to acquire the content, the content reproducing apparatus acquires the content in advance, and when the user gives an instruction to browse the encrypted content, the encrypted content is decrypted.

On the other hand, when the correspondence table between the decryption key and the encrypted content is received together with the encrypted content, the correspondence table between the decryption key and the encrypted content and the encrypted content are The user can browse only the encrypted content corresponding to the decryption key held in the terminal, which is unilaterally transmitted from the mobile terminal. Even for an unviewed broadcast corresponding to the already received encrypted content, the encrypted content can be browsed if the decryption key is obtained.

Further, in each of the above embodiments, the use of the network facilitates the update and distribution of the program.

Further, the above embodiment can be understood as a program invention. That is, the above embodiment
A broadcast reception procedure for receiving a radio wave broadcast or a cable broadcast including a content decryption key, a content decryption key extraction procedure for extracting the content decryption key from information obtained by receiving the broadcast, and the extracted content decryption Using the content decryption key holding procedure for holding the key, the encrypted content obtaining procedure for obtaining the predetermined encrypted content via the network, and the obtained encrypted content by using the held content decryption key. It is an example of a program that causes a computer to execute an encrypted content decryption procedure for decryption.

Then, the above program is changed to FD, CD,
It may be recorded on a recording medium such as a DVD, an HD, or a semiconductor memory.

According to the above embodiment, the terminal for viewing the program and acquiring the encryption key and the terminal for acquiring and reproducing the content are integrated, so that the program is always viewed in order to acquire the encryption key. However, conversely, the encryption key for the program cannot be input unless the program is viewed. That is, according to the above-described embodiment, it is possible to provide the premium content related to the program from the network only to the viewer who has watched a certain radio wave broadcast.

[0090]

According to the present invention, since the content decryption key included in the received broadcast radio wave is used as the content decryption key of the encrypted content via the network, only for the viewer who has watched a certain radio broadcast. , It is possible to provide premium content related to the program from the network.

[Brief description of drawings]

FIG. 1 is a block diagram showing a content reproduction device CR1 which is a first embodiment of the present invention.

FIG. 2 is a flowchart showing an operation of the content reproduction device CR1.

FIG. 3 is a block diagram showing a content reproduction device CR2 which is a second embodiment of the present invention.

FIG. 4 is a flowchart showing an operation of the content reproduction device CR2.

FIG. 5 is a block diagram showing a configuration of a content reproduction device CR3 which is a third embodiment of the present invention.

FIG. 6 is a flowchart showing an operation of the content reproduction device CR3.

FIG. 7 is a block diagram showing a content reproduction device CR4 which is a fourth embodiment of the present invention.

FIG. 8 is a flowchart showing an operation of the content reproduction device CR4.

[Explanation of symbols]

CR1, CR2, CR3, CR4 ... content reproducing device, 11 ... broadcast receiving means, 12 ... content decryption key extracting means, 13 ... content decryption key holding means, 14 ... encrypted content obtaining means, 15 ... encrypted content decrypting means, 16 ... Content reproduction means, 17 ... Content reproduction instruction means, 21 ... Content storage means, 22 ... Switching means, 31 ... Viewed content information transmission means.

Claims (7)

[Claims] 1. A broadcast receiving means for receiving a radio wave broadcast or a cable broadcast containing a content decryption key; a content decryption key extracting means for extracting the content decryption key from information obtained by receiving the broadcast; Content decryption key holding means for holding the extracted content decryption key; encrypted content acquisition means for obtaining a predetermined encrypted content via a network; and the obtained content decryption key by using the held content decryption key. And a content reproducing device that decrypts the encrypted content. 2. The encrypted content storage unit according to claim 1, further comprising an encrypted content storage unit for storing the acquired encrypted content, wherein the encrypted content decryption unit uses the stored content decryption key to perform the encryption. A content reproducing apparatus, which is means for decrypting encrypted content stored in encrypted content storage means. 3. The transmitting device according to claim 1, wherein when the content acquired via the network is reproduced, information indicating that the content has been reproduced is transmitted to a predetermined external device. A content reproducing apparatus characterized by having. 4. The content reproducing apparatus according to claim 1, wherein the content decryption key is a decryption key included in metadata or service information transmitted via the radio wave broadcast or cable broadcast. 5. A broadcast receiving step of receiving a radio wave broadcast or a cable broadcast including a content decryption key; a content decryption key extracting step of extracting the content decryption key from information obtained by receiving the broadcast; A content decryption key holding step of holding the extracted content decryption key; an encrypted content acquisition step of obtaining a predetermined encrypted content via a network; and the obtained content decryption key using the held content decryption key. And an encrypted content decrypting step of decrypting the encrypted content. 6. A broadcast receiving procedure for receiving a radio wave broadcast or a cable broadcast containing a content decryption key; a content decryption key extracting procedure for extracting the content decryption key from information obtained by receiving the broadcast; A content decryption key holding procedure for holding the extracted content decryption key; an encrypted content acquisition procedure for obtaining a predetermined encrypted content via a network; and the above obtained using the held content decryption key. And a program for causing a computer to execute the encrypted content decryption procedure for decrypting the encrypted content. 7. A broadcast reception procedure for receiving a radio wave broadcast or a cable broadcast including a content decryption key; a content decryption key extraction procedure for extracting the content decryption key from information obtained by receiving the broadcast; A content decryption key holding procedure for holding the extracted content decryption key; an encrypted content acquisition procedure for obtaining a predetermined encrypted content via a network; and the above obtained using the held content decryption key. And a computer-readable recording medium recording a program for causing a computer to execute the encrypted content decrypting procedure for decrypting encrypted content.