JP2003308653A - Contents recorder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a contents recorder capable of surely recording the contents. <P>SOLUTION: A contents recorder 10 includes a CPU 18, and by the CPU 18, license data are prepared in a charging mode or a reproducing mode and stored in a memory card 12. When a sound recording mode is set, the desired contents (music data) are stored in the memory card 12 after the compression process and encipherment are applied. At this time, the preliminarily produced license data are assigned to enciphered music data stored in the memory card 12. Consequently, the omission of a head part in the next music data does not occur since the time required for producing the license data is eliminated in the sound recording mode. <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 recording apparatus, and more particularly to a content recording apparatus for recording content such as music and images protected by copyright on a recording medium.

[0002]

2. Description of the Related Art A conventional content recording apparatus of this type is
For example, the specifications of mobile phone de music (trademark of mobile phone de music consortium) are adopted. Such a content recording device includes a CD
A plurality of music (contents) output from such a music reproducing device connected to a music reproducing device such as a player
Is input to the content recording device. In the content recording device, in the recording (sound recording) mode, the input music content is recorded on a recording medium such as a memory card. At this time, license information (data) is generated every time one (one piece of) music content is recorded, and is recorded in association with the music content. Here, the license information refers to information such as identification information (content ID) for identifying music content and control information regarding reproduction of music content. Such license information is recorded in a secure area of the recording medium for protection by copyright.

[0003]

However, in this conventional technique, license data is generated and recorded each time one music content is recorded, and it takes time to access a particularly secure area. Therefore, the time required to generate and record license data (for example,
(About 10 seconds) was longer than the interval between songs. Therefore, when continuously recording music contents corresponding to a plurality of songs, there is a problem that the head portion of the next song is missing.

Therefore, a main object of the present invention is to provide a content recording apparatus capable of surely recording content.

[0005]

According to the present invention, there is provided a first creating means for creating license data when a specific mode different from the content recording mode is selected, and the content is recorded on a recording medium when the content recording mode is selected. A content recording device comprising: recording means for recording; and first assigning means for assigning license data created by the first creating means to content recorded by the recording means.

[0006]

In the content recording apparatus, the first creating means creates the license data when a specific mode different from the content recording mode (for example, battery charging mode or content reproduction mode) is selected. Such license data is recorded in a recording medium such as a memory card that is detachably provided in the content recording device.
When the content recording mode is selected (set), the recording unit records the desired content on the recording medium, and the first assigning unit allocates the license data to the recorded content. That is, since the license data is created (generated) in advance, it is possible to save the time required to generate the license data in the content recording mode.

For example, the license data includes content decryption key data, and this content decryption key data is assigned to the recorded content. The encryption means encrypts the content so that the content can be decrypted using the content decryption key data assigned to the content, and the encrypted content is stored in the recording medium.
Therefore, for example, by restricting the exchange of the content decryption key data, it is possible to suppress the free reproduction (copy) of the content protected by the copyright.

[0008]

According to the present invention, since license data is created in advance and the license data is allotted each time content recording is completed, wasteful time can be saved and content can be reliably recorded. . Moreover, since the reproduction operation can be started immediately after the recording of the content is completed, the operability can be improved.

The above-mentioned objects, other objects, features and advantages of the present invention will become more apparent from the following detailed description of the embodiments with reference to the drawings.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, a content recording / reproducing apparatus (hereinafter, simply referred to as "recording / reproducing apparatus") 1 of this embodiment.
Reference numeral 0 includes a memory card 12, and the memory card 12 is detachably provided in the recording / reproducing device 10. The memory card 12 is mounted in a slot 14 provided in the recording / reproducing apparatus 10 and has a memory interface (I / F) 1
It is connected to the CPU 18 via 6.

As will be described in detail later, at least the encrypted content data (music data in this embodiment) and the content decryption key for decrypting the content data are stored in the memory card 12 as described above. To be done. Such music data conforms to a compression format such as MP3 and has an arbitrary compression rate (bit rate).
It is compressed with. That is, the music data stored in the memory card 12 has been subjected to compression processing and encryption processing.

The music data may be compressed according to another arbitrary compression format such as AAC.

The memory card 12 is, for example, a secure multimedia card, and includes a controller 50 as shown in FIG. The controller 50 includes a memory 54 and a license memory 56 via the internal bus 52.
And a key memory 58. The memory 54 stores data that can be freely exchanged, such as encrypted music data (encrypted music data) and unencrypted music data described above. In addition, the license memory 56 stores the data necessary for protecting the copyright such as the content decryption key, that is, the license data necessary for reproducing the encrypted music data and the certificate which has already been prohibited (revoked). Data (revocation list data) listing IDs (certificate IDs) is stored. Further, the key memory 58 stores a public authentication key used for mutual authentication (encryption) processing for transmitting and receiving license data. The license memory 56 and the key memory 58 are formed in an area (secure area) that cannot be accessed by a user operation.

In this embodiment, the license data is the content decryption key, control information (AC1, AC2), license I.
D and content ID. The content decryption key is
A decryption key (key) for decrypting encrypted music data. Further, the limit information (AC1) includes permission information for determining whether or not the content decryption key stored in the memory card 12 may be output, and number-of-times limiting information for limiting the number of reproductions.

The number-of-times limitation information is set, for example, as 2-bit data, that is, between "00" and "FF". When the number-of-times limitation information is "00", it indicates that reproduction is not possible, and when it is "FF", there is no limitation on the number of times of reproduction. Further, the number of times of reproduction is limited between “01” and “FE”. To be precise, the number of times the content decryption key is output is limited.

The control information (AC2) is information indicating a reproduction limit on the reproduction circuit side such as a reproduction time limit. Specifically, the reproduction deadline limits the date and time when reproduction is possible.

Further, the license ID is a management code that can specify the issuance of the license, and the content ID is an identification code for identifying the content data, that is, (encrypted) music data.

Returning to FIG. 1, an operation key 20 is connected to the CPU 18, and the operation key 20 is operated to switch modes, record (record), play, stop, feed (FF), and return. An instruction such as (RW) can be input.

The CPU 18 also includes an A / D converter 22.
The analog input terminal 24 is connected via. To the input terminal 24, a music CD / MD player or a component (mini component), which is not shown, can be connected. A music signal (input signal) reproduced from the music reproducing apparatus connected in this way is input through the input terminal 24 and converted into digital data by the A / D converter 22.
It is given to the CPU 18. Then, after being encoded (compressed) and encrypted by the instruction and processing of the CPU 18, it is transferred to the memory card 12 and recorded.

Music recorded on a CD or the like is protected by a copyright. In order to prevent such music from being freely reproduced or copied, as described above, encryption or the like is required. Is given.

A liquid crystal display 28 is connected to the CPU 18 via a driver 26. The display 28 shows the current time (calendar), the current mode (playback mode, recording mode, charging mode, etc.), and the operating state in the playback mode (playback, stop, FF or RW).
Etc.), the remaining battery level, the volume, the play list, and the name of the song being played and related information (related information; singer name, lyrics, name of songwriter / composer, image of jacket), etc. are displayed.

Here, the playlist means the memory card 1
Menu (list) of song names etc. of music data stored in 2
What is displayed. Using this play list, the user selects a song to play.

For example, the recording / reproducing apparatus 10 is configured as shown in FIG. 3, and when the user operates the mode key 20b included in the operation keys 20, at least a mode such as a reproducing mode and a recording mode is set. You can However, the charging mode is automatically set when the charging of the battery is started. At this time, the user can determine which mode is selected by looking at the display on the display 28.

When the reproduction mode is set, although not shown, a cursor for selecting a reproduction list and music (song) as described above is displayed on the display 28. Here, when the user rotates the jog dial 20a included in the operation key 20 to either one, the cursor is scrolled up and down on the screen of the display 28, so that a desired song can be selected. Then
When the jog dial 20a is pressed (turned on), that is, when a reproduction instruction is input, the reproduction processing of the music pointed by the cursor is started.

In this way, the CPU 18 starts the reproduction process, but executes the authentication process with the memory card 12 before starting the reproduction. This authentication process is a well-known authentication process using a public key, and the recording / reproducing device 10 (CP
U18) and memory card 12 (controller 50)
By exchanging keys (session keys) with each other, it is possible to determine whether or not the recording / reproducing apparatus 10 has the correct certificate (information), that is, whether the recording / reproducing apparatus 10 is a proper one. Has confirmed (authenticated).

Briefly, the key memory 44 stores the certificate data and the secret decryption key, and the encrypted certificate data obtained by encrypting this certificate data with the public key is stored in the memory card 12 by the CPU 18. To the controller 50. The controller 50 uses the public key stored in the key memory 58 to decrypt the encrypted certificate data and determines whether the certificate data is correct. If this certificate data is invalid, then the controller 50
Does not perform any processing. On the other hand, if the authentication data is valid, that is, if the authentication is successful, a key unique to the session (session key) between the CPU 18 and the controller 50.
After the exchange of the
Outputs the content decryption key to the CPU 18. And
The corresponding encrypted music data is also output.

In this embodiment, the memory card 12
Is configured to be attachable to and detachable from the recording / reproducing device 10,
The authentication process is required, but when the memory card 12 is integrally (non-detachably) provided in the recording / reproducing apparatus 10, the authentication process is unnecessary.

As described above, if the authentication process is successful,
In other words, if the recording / reproducing device 10 is a regular device,
At least encrypted music data corresponding to the selected song and a content decryption key for decrypting the encrypted music data are given from the memory card 12 to the CPU 18 via the memory I / F 16.

As described above, such compressed music data is stored in the memory 54 provided in the memory card 12, and as shown in FIG.
(In this embodiment, the music data that can be recorded in the memory card 12 is 128 songs (pieces), and n is a natural number from 1 to 128.) is a number associated with each (encrypted content number). The table is managed by. On the other hand, the license data (license n) is stored in the license memory 56 as described above, and is associated with the number (secure area number) assigned in the secure area (license memory 56) as shown in FIG. The table is managed. Further, as shown in FIG. 6, a license information file in which an encrypted content number and a secure area number are associated with each other is managed in a table in the memory 54. Therefore, the license data and the encrypted content data are indirectly associated with each other. In other words, the license data is assigned to the encrypted content data.

In FIG. 6, the license information file after erasing and recording the encrypted content data and the license data several times is shown in a table.

Such a license information file is added in a recording process which will be described later, and the corresponding item is deleted when the encrypted content data is erased.

When the CPU 18 receives the encrypted music data and the content decryption key, it decrypts (plain culture) the encrypted music data with the content decryption key and gives the decrypted music data to the DSP 30. Further, the CPU 18 reads the decoding software stored in the flash memory 44 and in accordance with the music data compression format,
Give to the DSP 30. Therefore, the DSP 30 decodes (expands) the music data according to the MP3 format using the decoding software. The decoded music data is converted into an analog music signal by the D / A converter 32. Then, the converted music signal is amplified by the audio amplifier (AMP) 34 and then input to the headphones 38 from the output terminal (jack terminal) 36. As a result, the user can listen to the song for which reproduction is instructed.

When the jog dial, that is, the key 20a is rotated in one direction during the reproduction of the music data, the fast forward reproduction or the next music piece is performed. On the other hand, the key 20
When a is rotated in the opposite direction, rewinding playback,
Go back to the previous song. Further, by operating the volume (Vol-, Vol +) keys 20c and 20d included in the operation key 20, the volume of the song being reproduced can be reduced,
It can also be made larger. And the stop key 20
By operating f, the reproduction of the music can be stopped (ended).

When the recording mode is set, the recording / reproducing device 10 is in a recordable state. Then, by operating the music reproducing device connected to the input terminal 24, the music C
Playback of D is started. On the other hand, when the recording (REC) key 20e included in the operation keys 20 of the recording / reproducing apparatus 10 is operated, recording (recording) is started. An input signal input from the music reproducing device, that is, a music signal is input to the input terminal 24.
After being converted into digital music data by the A / D converter 22 via, the data is given to the CPU 18.

In the recording mode, the operation key 20
When the stop (STOP) key 20f included in is operated, the recordable state is released. That is, recording becomes impossible.

During recording, the CPU 18 gives music data to the LSI 40 and instructs encoding (compression). Under the instruction of the CPU 18, the LSI 40 compresses the music data according to the MP3 format. That is, the music data is encoded. Then, the encoded music data is temporarily stored in the buffer memory 42 via the CPU 18. However, the encoded music data may be directly supplied from the LSI 40 to the buffer memory 42.

In this embodiment, the dedicated LSI 40 for performing the compression process is provided, but the DS
If the compression process is executed in P30, the LSI 40
Can be omitted.

Once the encoded music data is held in the buffer memory 42, the CPU 18 encrypts the encoded music data. This is to prevent copyright-protected content such as music from being freely exchanged in a reproducible state.

Since such encryption is applied to the music data so that the content data can be decrypted using the content decryption key as described above, the content decryption key also needs to be generated. At this time, control information and the like are generated in addition to the content decryption key. That is, license data is generated.

In this embodiment, the encrypted music data can be freely exchanged, but the copyright information is protected so that the license information (license data) cannot be freely exchanged. That is, even if the encrypted music data is freely exchanged, if the content decryption key included in the license data corresponding to the encrypted music data is not included, the encrypted music data can be decrypted (plain culture). It is not possible to play music data. Such license data is recorded in a secure area of the memory card 12, that is, the license memory 56, and the output of the content decryption key is limited.

Therefore, when the license data is generated each time a song ends, the generated license data is written in the license memory 56, the license data is read from the license memory 56, and the content decryption key is read from the read license data. And the content decryption key is used for encryption. That is, it is necessary to access the license memory 56.
Such a license memory 56 uses a secure protocol with the CPU 18 so that the user cannot freely access it. Therefore, if the license memory 56 is accessed each time a song ends, it takes time to generate license data, time to establish a protocol, and time to encrypt music data. , There is a problem that the beginning (head) part of the next song cannot be recorded.

In order to avoid this, in this embodiment, the license information (license data) is set in a specific mode other than the recording mode such as charging the battery (charging mode) or playing music (playing mode). Create (generate). Then, unused license data prepared (stored) in advance is read, and the music data is encrypted so that it can be decrypted using the content decryption key extracted from the read license data. As a result, during recording, it is possible to save time other than the time required for recording music data, so that the problem that the head of the next song (track) is not chipped does not occur.

In the charging mode, the user normally does not operate the recording / reproducing apparatus 10, so the CPU 18
Generates license data in the meantime. For example,
At the time of purchasing the recording / reproducing apparatus 10, it is necessary to charge the battery first, so that the license data is generated during this period.

Further, in the reproduction mode, the license data is generated by utilizing the idle time when the CPU 18 is not involved in the reproduction operation. For example, the CPU 18 gives an empty time from when the music data and the encoding software are given to the DSP 30 until the next music data is reproduced (decoding, etc.).
Generate license data.

Specifically, the CPU 18 executes the processing as shown in FIG. When the main power source of the recording / reproducing apparatus 10 is turned on, the CPU 18 starts the process and determines in step S1 whether or not the recording mode is set. If "YES" in the step S1, that is, if the recording mode is set, a recording process which will be described in detail later is executed in a step S3, and then the process returns to the step S1.

On the other hand, if "NO" in the step S3,
That is, if the recording mode is not set, step S
At 5, it is determined whether the charging mode or the reproduction mode is set. If "NO" in the step S5, that is, if the charging mode or the reproduction mode is not set, it is determined that neither mode is set, and the process directly returns to the step S1.

However, if "YES" in the step S5, that is, if the charging mode or the reproduction mode is set, the license data generation process is started, and the generation of the license data from the flash memory 44 is completed in a step S7. Read the number A. At this time, the CPU 18 sets the generation completion number A in a counter (not shown). Then, in step S9, it is determined whether or not the number A of completed generations exceeds 128.

If "YES" in the step S9, that is, if the number A of completed generations exceeds 128, it is determined that generation of all license data is completed, and the process directly returns to the step S1. On the other hand, if “NO” in the step S9, that is, if the number A of completed generations is less than 128, a content decryption key is generated in a step S11.

Then, in step S13, step S
The license data including the content decryption key generated in 11 is generated, and the license data is written in the memory card 12, that is, the license memory 56 in step S15. Then, in step S17, it is determined whether or not the charging mode or the reproduction mode has ended.

If "YES" in the step S17, that is, if the charging mode or the reproduction mode is ended, the license data generation process is ended as it is, and the process returns to the step S1. On the other hand, if "NO" in the step S17, that is, if the charging mode or the reproduction mode is not ended, the counter is incremented (A =
A + 1), and the process returns to step S9.

Although illustration is omitted, step S5
When it is determined to be "YES" in the case of the reproduction mode, the CPU 18 executes the processing of steps S7 to S19 and also the reproduction processing of the music data.

As shown in FIG. 8, when the recording process of step S3 shown in FIG. 7 is started, first, the CPU 18
By exchanging with the controller 50 included in the memory card 12, it is authenticated whether the recording / reproducing device 10 and the memory card 12 are genuine ones. Since the authentication process uses the public key method and is already well known, detailed description thereof will be omitted in this embodiment.

In a succeeding step S33, it is determined whether or not the authentication is OK. If “NO” in the step S33,
That is, if the authentication is NG, an error is displayed on the display 28 in step S35, and the recording process is returned. For example, in step S35, a message prompting the replacement of the memory card 12 such as "Please replace the memory card" is displayed together with the error message "The memory card is not correct" or "Authentication failed". .

On the other hand, if "YES" in the step S33, that is, if the authentication is OK, all the unused license data are read from the memory card 12. At this time,
The CPU 18 can know the unused license data by referring to the license information stored in the memory 54 of the memory card 12.

In the following step S39, the CPU 18
The content decryption key is read from all the read license data, and specifically, the content decryption key is duplicated (copied) and stored in the flash memory 44. Next, in step S41, the music data is encoded according to the MP3 format. That is, the CPU 18 inputs music data to the LSI 40 and gives an instruction for encoding. The encoded music data is written in the buffer memory 42 in step S43. Then, in step S45, the encoded music data is encrypted using the content decryption key held in the flash memory 44 so that it can be decrypted by the content decryption key.

Then, in step S47, the license information file is updated, and in step S49, it is determined whether or not there is the next track (music data). If "NO" in the step S49, that is, if there is no next music data, the recording process is ended as it is. On the other hand, if “YES” in the step S49, that is, if there is the next music data, the process returns to the step S41. In this way, until the recording (recording) of all music data is completed,
The processing of steps S41 to S49 is repeated.

In step S47, the encrypted content number of the encrypted music data recorded (recorded) this time and the secure area number of the license data including the content decryption key for decrypting the encrypted music data correspond to each other. Then, the contents of the license information file are updated. That is, each time the (encrypted) music data is recorded, the license data is assigned and one item in the table shown in FIG. 6 is added.

According to this embodiment, since the license data is generated and prepared in advance, the music data can be encrypted even during a short time such as between songs. That is, the music data can be reliably recorded. Further, after the recording is completed, the reproduction or the like can be executed immediately, so that the operability can be improved.

In this embodiment, the case where only one memory card 12 is used has been described, but in reality, it is assumed that a plurality of memory cards 12 are used. Therefore, the flash memory 44 stores the generation completion number A for each memory card 12, and the CPU 1
8 may identify the ID of the memory card 12 when the license data is generated and recorded.

Further, although the decoding software for decoding the music data is stored in the flash memory of the recording / reproducing apparatus in this embodiment, a dedicated ROM may be provided or the memory card of the memory card may be provided. The decoder software may be stored in the memory. However, in the case of storing in the memory of the memory card, when the music data is given to the recording / reproducing device (CPU) or after the compressed music data is demodulated, the decoding software is executed by the CPU.
Need to give to.

Further, the content data is not limited to music data but includes various data protected by copyright such as image data, map data and document data. When reproducing such image data, map data, and document data, the image, map, and document are displayed on the display, respectively.

[Brief description of drawings]

FIG. 1 is an illustrative view showing an electrical configuration of a recording / reproducing apparatus of the present invention.

2 is an illustrative view showing an electrical configuration of a memory card detachably provided in the recording / reproducing apparatus shown in FIG. 1 embodiment. FIG.

FIG. 3 is an illustrative view showing a configuration of the recording / reproducing apparatus shown in FIG. 1 embodiment as seen from the front.

FIG. 4 is an illustrative view showing a table of encrypted content numbers and encrypted content data stored in a memory of the memory card shown in FIG. 1 embodiment.

5 is an illustrative view showing a table of secure area numbers and licenses stored in a license memory of the memory card shown in FIG. 1 embodiment. FIG.

FIG. 6 is an illustrative view showing a table of encrypted content numbers and secure area numbers stored in the memory of the memory card shown in FIG. 1 embodiment.

FIG. 7 is a flowchart showing a part of the entire processing of the CPU shown in FIG. 1 embodiment.

FIG. 8 is a flowchart showing a recording process of the CPU shown in FIG. 1 embodiment.

[Explanation of symbols]

10 ... Recording / reproducing apparatus 12 ... Memory card 18 ... CPU 20 ... Operation key 28 ... Display 30 ... DSP 40 ... LSI 42 ... Buffer memory 44 ... Flash memory 46,58 ... Key memory 50 ... Controller 54 ... Memory 56 ... License memory

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) H04L 9/10 H04L 9/00 621A F term (reference) 5B017 AA03 BA07 CA14 5B035 AA13 BB09 BB11 CA29 5B058 CA02 CA22 KA12 KA12 KA21 KA31 KA35 YA20 5D044 AB05 CC08 DE49 DE50 EF05 GK08 GK12 GK17 HL08 5J104 AA18 EA19 NA27

Claims (5)

[Claims] 1. A first creating means for creating license data when a specific mode different from the content recording mode is selected, a recording means for recording the content on a recording medium when the content recording mode is selected, and A content recording device, comprising: first allocation means for allocating the license data created by the first creation means to the content recorded by the recording means. 2. The content recording apparatus according to claim 1, wherein the recording medium is removable, and the first creating unit creates the license data in the recording medium. 3. The license data includes content decryption key data, the recording means encrypts the content based on the content decryption key data, and the content encrypted by the encryption means. The content recording apparatus according to claim 1, further comprising a content recording unit that records the content on the recording medium. 4. The content recording apparatus according to claim 1, wherein the specific mode includes a charging mode for charging a battery. 5. The content recording apparatus according to claim 1, wherein the specific mode includes a reproduction mode for reproducing content.