JP2005302110A - Recording medium reproducing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a recording medium reproducing method in which a user can guess the contents data stored in a recording medium, by the display output of additional information on the contents data, even when the authentication is not established. <P>SOLUTION: Before performing the mutual authentication by a player 101, the additional information 208 is read by an additional information acquisition procedure step S303. In the subsequent additional information display procedure step S304, the additional information such as the number of the pieces of music and the performance time of the encrypted contents data 209 is outputted to a display part 111. Thereafter, the mutual authentication is performed in an authentication processing procedure step S305, and the procedure of the steps S306-S310 is performed when the authentication is established, and the reproduction of the encrypted contents data is performed. When the authentication is not established, an end procedure step S311 is performed, and the reproduction operation is interrupted. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention is a recording medium in which audio and video content data is encrypted and stored, and management information indicating the reproduction time and reproduction order of the content data, and additional information such as the title and creation date of the content data are stored. The present invention relates to a playback method of a recording / playback apparatus that performs playback or recording / playback.

  Recent recording / playback devices are capable of digital recording / playback, such as digital video and mini-disc players, and record / playback additional information such as titles of content data with little deterioration of video and audio content data. It is also possible and the feeling of use is improved. In addition, content can be easily enjoyed by downloading content data from the Internet, and it has come to be widely used not only for business purposes but also in the consumer sector.

  On the other hand, there is a possibility that illegal content data may be exchanged or copied, and content data encryption technology is used to prevent unauthorized copying, and a recording medium with a copyright protection function such as a semiconductor memory card or the like is used. Recording and playback devices that have been released have been released. The copyright protection function performs mutual authentication to detect hacked recording / playback devices. If mutual authentication is not established, the copyright protection function determines that the device is a hacked device, and revokes, while when mutual authentication is established, it decrypts the encrypted content data. It is a function that can be reproduced while playing (see, for example, Patent Document 1).

Here, mutual authentication is a sequence for enabling data read / write in an authentication area in a semiconductor memory card or the like, and on the recording / reproducing device side using a media ID held in the semiconductor memory card. This is done by determining whether the calculated key matches the key held by the semiconductor memory card. Also, data reading / writing can be performed from the card authentication area only after mutual authentication is established. If mutual authentication is not established, only invalid data (such as data in which all bits are at a high level) can be read.
JP 2001-14441 (page 5-6, FIG. 5)

  However, in the conventional recording / reproducing apparatus, when the mutual authentication is performed after the recording medium is detected, if the authentication is not established, the operation of the immediate recording / reproducing is stopped because there is a possibility of illegal copying. Therefore, the user cannot know what the content data stored in the recording medium is.

  The present invention takes the following means in order to solve the above problems.

  The first recording medium reproducing method of the present invention includes a procedure for detecting attachment of a recording medium having a mutual authentication function in which content data and additional information indicating the content data are stored, and the attached recording medium A procedure for acquiring the additional information from the computer, a procedure for displaying the acquired additional information before mutual authentication, and a procedure for performing mutual authentication to determine whether the content data of the recording medium can be reproduced after the display. It is characterized by having.

  According to this configuration, the additional information of the content data is acquired from the recording medium as the recording medium is mounted, and the additional information is displayed. This additional information is displayed before the mutual authentication. Therefore, the additional information is displayed regardless of whether the mutual authentication is established or not. That is, even if mutual authentication is not established, it is possible to notify the user what kind of content data is stored in the recording medium.

  The second recording medium playback method according to the present invention is the above-described first recording medium playback method, and further, when the result of mutual authentication is not established, the content data of the recording medium cannot be played back. It has the procedure which displays a warning that it is.

  According to this configuration, even if mutual authentication is not established, the user can be informed of the content data stored in the recording medium, and a warning is issued after the mutual authentication is not established. The display can inform the user that the content data cannot be reproduced.

  The third recording medium playback method according to the present invention includes a procedure for alternately performing the warning display and the display of the additional information in place of the warning display in the second recording medium playback method. Features.

  According to this configuration, after the mutual authentication is not established, the user can be repeatedly informed of the content data that cannot be reproduced and the content data.

  The fourth recording medium playback method according to the present invention is the above-described first recording medium playback method, and further, when the result of the mutual authentication is not established, continues the display of the additional information and performs a playback instruction. And a procedure for displaying a warning that the reproduction of the content data on the recording medium is impossible when the reproduction instruction is detected.

  According to this configuration, after confirming that mutual authentication has not been established, the display of what the content data is is continued until the user operates the key, thus giving the user time to confirm. It is possible to notify the user that the content data cannot be reproduced.

  The fifth recording medium playback method according to the present invention is characterized in that, in the fourth recording medium playback method, the additional information is displayed after the warning display.

  According to this configuration, it is possible to display what content data that cannot be reproduced is before and after the key operation.

  Further, a sixth recording medium reproduction method according to the present invention has a procedure for alternately performing the warning display and the display of the additional information in place of the warning display in the fourth recording medium reproduction method. Features.

  According to this configuration, it is possible to repeatedly inform the user that the content data is not reproducible even after a key operation and what kind of content data it is.

  According to the first recording medium playback method of the present invention, even if authentication is not established, the content data stored in the recording medium can be determined by the user by the display output of the additional information of the content data. You can crawl or know.

  In addition, according to the second recording medium playback method of the present invention, the user can know what the content data stored in the recording medium is even when authentication is not established. After the authentication failure is confirmed, the content data cannot be reproduced by the warning display.

  Further, according to the third recording medium playback method of the present invention, even after the authentication failure is confirmed, the user can reproduce what content data is stored in the recording medium and the content data. It can be confirmed repeatedly that it is impossible.

  Further, according to the fourth recording medium playback method of the present invention, the display output of the additional information indicating the contents of the content data is continued until the user's key operation even after the authentication failure is confirmed, and the warning display is waited for the key operation. Since the process proceeds, the user can secure sufficient time for recognizing what the content data is.

  Further, according to the fifth recording medium playback method of the present invention, the display output of the additional information indicating the contents of the content data is continued until the user's key operation even after the authentication failure is confirmed, and the warning display waits for the key operation. Since the process proceeds, the user can secure a sufficient time for recognizing what the content data is, and can know again what the content data is after displaying the warning.

  Further, according to the sixth recording medium reproduction method of the present invention, in addition to the operational effects of the fifth recording medium reproduction method, the user can determine what content data is stored in the recording medium. It can be repeatedly confirmed that the content data cannot be reproduced.

  Embodiments of a recording medium reproducing method according to the present invention will be described below in detail with reference to the drawings.

(Embodiment 1)
FIG. 1 is a block diagram showing a hardware configuration of a player that is a recording / reproducing apparatus using a semiconductor memory card with a copyright protection function as a recording medium.

  In FIG. 1, a player 101 includes a CPU 103 that executes a system control program, a removable semiconductor memory card (hereinafter referred to as a memory card) 102 with a copyright protection function, a card IF unit 104, an authentication unit 105, a buffer, and the like. A RAM 106, a signal processing unit 107, a decoding unit 108, a DAC (D / A converter) 109, an operation key unit 110 for inputting user key operations, and a display unit 111 for displaying various operation states of the player. .

  Here, the CPU 103, the card IF unit 104, the authentication unit 105, the buffer RAM 106, and the signal processing unit 107 are connected by a bus 112, and can transmit / receive commands for performing data read / write and various controls.

  Further, the CPU 103 performs a mutual authentication procedure by accessing the authentication unit 105 through the memory card 102 and the card IF unit 104. Thereafter, the encrypted music content data is read from the memory card 102 to the buffer RAM 106 through the card IF unit 104. Subsequently, the encrypted content data stored in the buffer RAM 106 is sequentially sent to the signal processing unit 107 to perform decryption and descrambling. The decoded content data is converted into audio data by the decoding unit 108, converted from digital to analog by the DAC 109, and output as audio.

  FIG. 2 is a structural diagram showing a memory area data structure of the memory card 102 according to the first embodiment.

  In FIG. 2, the memory card 102 includes an authentication unit 201 for performing mutual authentication processing, a special area 202 that cannot be rewritten from the outside, an authentication area 203 that is accessible after mutual authentication is established, and a data area without authentication. A non-authentication area 204 that can be read and written, a master key 205 stored in the authentication section 201, a media ID 206 that is a card-specific identification number stored in the special area 202, and encrypted content data stored in the authentication area 203 The encryption key 207, attributes such as the sampling frequency and bit rate of the music content data stored in the non-authentication area 204, and additional information 208 which is reference information such as the number of recorded music, recording time, playback order, title, etc. Encrypted content obtained by encrypting the music content data to be played stored in the authentication area 204 It has a chromatography data 209.

  A read sound is obtained by reading the encrypted content data 209 and decrypting it, and display information is obtained by reading the additional information 208. In the non-authentication area 204, document files and various data files can be stored in addition to the additional information 208 and the encrypted content data 209.

  FIG. 3 is a flowchart showing the processing procedure of the CPU 103 during the playback operation of the player 101.

  In FIG. 3, first, the CPU 103 detects the attachment of the memory card 102 (step S301). Next, the memory card 102 is initialized (step S302). Here, the initialization of the memory card 102 is performed in accordance with a procedure defined in the semiconductor memory card with a copyright protection function, thereby enabling communication between the recording / reproducing device and the semiconductor memory card. After the initialization of the memory card 102 is completed, additional information 208 is acquired from the non-authentication area 204 (step S303). Next, the music information of the music to be reproduced is extracted from the acquired additional information 208, and the number of music and the performance time are output to the display unit 111 (step S304). On the display unit 111, for example, as shown in FIG. 4A, a playlist number (PL), a track number (TNo), and a performance time (TIME) are displayed.

  Thereafter, mutual authentication with the memory card 102 is performed using the authentication unit 105 (step S305). If mutual authentication is established in step S305, the master key 205 is acquired from the authentication unit 201 (step S306). Next, the media ID 206 is acquired from the special area 202 (step S307). Subsequently, the encryption key 207 is acquired from the authentication area 203 that can be accessed after mutual authentication is established (step S308). Subsequently, the encryption key 207 is decrypted using the master key 205 and the media ID 206 acquired in the above procedures, thereby extracting a title key that is key information of the encrypted content data (step S309). Next, the signal processing unit 107 uses the extracted title key to sequentially read / decrypt the encrypted content data 209 from the non-authentication area 204 to decrypt the encrypted data and output the decrypted audio data to the decoding unit 108. . Thereafter, as described with reference to FIG. 1, the decoding unit 108 and the DAC 109 operate, and the reproduction operation is performed (step S310).

  If authentication is not established in step S305, the output of the DAC 109 is muted, the decoding of the decoding unit 108 is stopped, the processing of the signal processing unit 107 is stopped, and the memory card of the card IF unit 104 is also stopped. A termination process is performed in which reading of the content data from 102 is stopped (step S311). As a result, the reproduction operation is interrupted.

  In the additional information display procedure S304, the number of songs and the performance time are displayed. However, character information such as a song title and a player name, and image information such as an album jacket may be displayed. Further, the display pattern of the display unit 111 may be different from that shown in FIG. 4A, such as displaying the title of content data or displaying attributes of the content data (sampling frequency, bit rate, number of channels, etc.). .

  According to the present embodiment, additional information (content data attributes, reference information, etc.) stored in the memory card is displayed before recognition, so that even if authentication is not established, the user can use the memory card. It is possible to know what kind of content data is stored in.

(Embodiment 2)
The block diagram showing the hardware configuration of the player and the structure diagram showing the memory area data configuration of the memory card in the second embodiment of the present invention are the same as those in the first embodiment. FIG. 5 is a flowchart showing the processing procedure of the CPU 103 during the playback operation of the player 101 in the second embodiment of the present invention.

  In FIG. 5, when mutual authentication is not established as a result of the process of step S305, a warning display is output to the display unit 111 (step S312). On the display unit 111, a warning display pattern as shown in FIG. 4B is displayed. Thereafter, a termination process S311 is performed, and the reproduction operation is interrupted.

  According to the present embodiment, after the authentication failure is confirmed, the warning display allows the user to know that the content data cannot be reproduced.

(Embodiment 3)
The block diagram showing the hardware configuration of the player and the structure diagram showing the memory area data configuration of the memory card in the third embodiment of the present invention are the same as those in the first embodiment. FIG. 6 is a flowchart showing the processing procedure of the CPU 103 during the playback operation of the player 101 according to the third embodiment of the present invention.

  In FIG. 6, when mutual authentication is not established as a result of the process in step S305, a warning display is output to the display unit 111 for a predetermined time (step S312). On the display unit 111, a warning display pattern as shown in FIG. 4B is displayed for a certain period of time. Next, as shown in FIG. 4A, additional information such as the number of songs and elapsed time is displayed for a certain period of time (step S313). Then, by repeating the authentication error display procedure S312 and the additional information display procedure S313, the music number / performance time display of FIG. 4A and the warning display of FIG. 4B are repeatedly performed.

  According to the present embodiment, after the authentication failure is confirmed, the user knows that the content data stored in the memory card cannot be reproduced by a warning display, and what the content data is. You can know ugly.

(Embodiment 4)
The block diagram showing the hardware configuration of the player and the structure diagram showing the memory area data configuration of the memory card in the fourth embodiment of the present invention are the same as those in the first embodiment. FIG. 7 is a flowchart showing the processing procedure of the CPU 103 during the reproduction operation of the player 101 in the fourth embodiment of the present invention.

  In FIG. 7, when mutual authentication is not established as a result of the process in step S305, a key operation input for a reproduction instruction from the user is detected (step S315). If a key operation input is detected, a warning display is output to the display unit 111 in step S312. On the display unit 111, a warning display pattern as shown in FIG. 4B is displayed. Next, an end process S311 is performed, and the reproduction operation is interrupted.

  According to the present embodiment, even after mutual authentication failure has been established, additional information indicating the content data is displayed and output until the user's key operation, and the warning display proceeds after waiting for the key operation. Sufficient time can be secured to recognize what the data is.

(Embodiment 5)
The block diagram showing the hardware configuration of the player and the structure diagram showing the memory area data configuration of the memory card in the fifth embodiment of the present invention are the same as those in the first embodiment. FIG. 8 is a flowchart showing the processing procedure of the CPU 103 during the playback operation of the player 101 in the fifth embodiment of the present invention.

  In FIG. 8, when the mutual authentication is not established as a result of the process of step S305 and the key operation input of the reproduction instruction from the user is detected in step S315, as shown in FIG. 4B in step S312. Displays authentication error for a certain period of time Next, as shown in FIG. 4A, additional information such as the number of music pieces and performance time is output and displayed on the display unit 111 for a predetermined time (step S313). Thereafter, step S311 is performed, and the reproduction operation is interrupted.

  According to the present embodiment, even after mutual authentication failure has been established, additional information indicating the content data is displayed and output until the user's key operation, and the warning display proceeds after waiting for the key operation. It is possible to secure a sufficient time for recognizing what the data is, and to know again what the content data is after displaying the warning.

(Embodiment 6)
The block diagram showing the hardware configuration of the player and the structure diagram showing the memory area data configuration of the memory card in the sixth embodiment of the present invention are the same as those in the first embodiment. FIG. 9 is a flowchart showing the processing procedure of the CPU 103 during the reproduction operation of the player 101 in the sixth embodiment of the present invention.

  In FIG. 9, when the mutual authentication is not established as a result of the process of step S305 and the key operation input of the reproduction instruction from the user is detected in step S315, as shown in FIG. 4B in step S312. Displays authentication error for a certain period of time Next, as shown in FIG. 4A, additional information such as the number of music pieces and performance time is output and displayed on the display unit 111 for a predetermined time (step S313). Next, as shown in FIG. 4A, additional information such as the number of songs and elapsed time is displayed for a certain period of time (step S313). Then, by repeating the authentication error display procedure S312 and the additional information display procedure S313, the music number / performance time display of FIG. 4A and the warning display of FIG. 4B are repeatedly performed.

  According to the present embodiment, in addition to the effects of the fifth embodiment, the user repeatedly determines what kind of content data is stored in the recording medium and cannot reproduce the content data. Can be confirmed.

  The recording medium playback method of the present invention is a digital recording / playback apparatus or playback apparatus such as a digital video or minidisc player having a mutual authentication function for copyright protection, regardless of the result of mutual authentication. This is useful as a technology that allows the user to confirm the content data.

1 is a block diagram showing a hardware configuration of a recording / reproducing apparatus having a copyright protection function according to Embodiment 1 of the present invention. The block diagram which shows the memory area data structure of the semiconductor memory card with a copyright protection function in embodiment of this invention The flowchart which shows the process sequence of the recording-medium reproducing | regenerating method in Embodiment 1 of this invention. The display pattern figure which shows the display content in the display part used by embodiment of this invention The flowchart which shows the process sequence of the recording-medium reproducing | regenerating method in Embodiment 2 of this invention. The flowchart which shows the process sequence of the recording-medium reproduction | regeneration method in Embodiment 3 of this invention. The flowchart which shows the process sequence of the recording-medium reproducing | regenerating method in Embodiment 4 of this invention. The flowchart which shows the process sequence of the recording-medium reproducing | regenerating method in Embodiment 5 of this invention. The flowchart which shows the process sequence of the recording-medium reproducing | regenerating method in Embodiment 6 of this invention.

Explanation of symbols

101 player 102 memory card 103 CPU
104 Card IF unit 105 Authentication unit 106 Buffer RAM
107 Signal Processing Unit 108 Decoding Unit 109 DAC (D / A Converter)
110 Operation key section 111 Display section 201 Memory card authentication section 202 Memory card special area 203 Memory card authentication area 204 Memory card non-authentication area 205 Master key 206 Media ID
207 Encryption key 208 Additional information 209 Encrypted content data S301 Card insertion detection procedure S302 Card initialization procedure S303 Additional information acquisition procedure S304, S313 Additional information display procedure S305 Authentication procedure S306 Master key acquisition procedure S307 Media ID procedure S308 Encryption key Acquisition procedure S309 Title key extraction procedure S310 Music playback procedure S311 End procedure S312 Authentication error display procedure S315 Playback instruction key input detection procedure

Claims (6)

A procedure for detecting attachment of a recording medium with a mutual authentication function in which content data and additional information indicating the content data are stored;
Acquiring the additional information from the mounted recording medium;
A procedure for displaying the acquired additional information before mutual authentication;
A method of reproducing a recording medium, comprising: performing mutual authentication to determine whether the content data of the recording medium can be reproduced after the display.   2. The recording medium reproduction according to claim 1, further comprising a procedure for displaying a warning that the reproduction of the content data on the recording medium is impossible when the result of the mutual authentication is not established. Method.   3. The recording medium reproducing method according to claim 2, further comprising a procedure of alternately displaying the warning display and the additional information instead of the warning display. Further, a procedure for detecting that a reproduction instruction has been performed while continuing to display the additional information when the result of mutual authentication is not established,
2. The recording medium reproducing method according to claim 1, further comprising a step of displaying a warning that the reproduction of the content data on the recording medium is impossible when the reproduction instruction is detected.   5. The recording medium reproducing method according to claim 4, further comprising a step of displaying the additional information after the warning display.   5. The recording medium reproducing method according to claim 4, further comprising a procedure for alternately displaying the warning display and the additional information instead of the warning display.

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