JP2009104701A - Media playback system, media playback device, optical recording medium, and control program - Google Patents

Abstract

A media playback system, media playback device, optical recording medium, and control program capable of managing playback of the optical recording media without limiting the recording capacity of the optical recording media are provided.
A semiconductor memory capable of non-contact communication is provided on an optical recording medium, and reproduction permission information is selectively recorded on the semiconductor memory, and the media reproduction apparatus has the reproduction permission information recorded on the semiconductor memory. In this case, it is determined that the reproduction of the optical recording medium is permitted. When the reproduction of the optical recording medium is permitted, the information recorded in the information recording area of the optical recording medium is reproduced.
[Selection] Figure 6

Description

  The present invention relates to a media playback system, a media playback device, an optical recording medium, and a control program capable of managing playback of optical recording media.

In recent years, a technique for preventing unauthorized use of recording media such as CD (Compact Disc) and DVD (Digital Versatile Disc) has been demanded. As such a technique, a storage area identified by an access identifier received secretly is provided for one contactless IC tag, and access to the storage area is restricted (see, for example, Patent Document 1). ).
Japanese Patent Laid-Open No. 2001-307055

  However, since the conventional technology records information for restricting access (such as an access identifier) in the information recording area of the recording medium, the entire recording capacity of the recording medium cannot be used for the content. In particular, the recording capacity of optical recording media is standardized, and music and video content to be recorded on this medium is created in accordance with the disc capacity, so that other information may not be recorded.

  The present invention has been made in view of the above-described circumstances, and is a media playback system, media playback device, optical recording medium, and control program capable of managing playback of optical recording media without limiting the recording capacity of the optical recording media. Is to provide.

In order to solve the above-mentioned problems, the present invention provides a media playback system for playing back an optical recording medium with a media playback device, wherein a semiconductor memory capable of non-contact communication is provided on the optical recording medium, and playback permission information is provided in the semiconductor memory. And the media playback device includes: a memory access unit capable of reading information recorded in the semiconductor memory; and the optical recording medium when the playback permission information is recorded in the semiconductor memory. Reproduction determining means for determining that reproduction of the optical recording medium is permitted; and media reproduction means for reproducing information recorded in the information recording area of the optical recording medium when reproduction of the optical recording medium is permitted. It is characterized by providing.
According to this configuration, the media playback device determines that playback of the optical recording medium is permitted when the playback permission information is recorded in the semiconductor memory of the optical recording medium, and the information recording area of the optical recording medium Since the information recorded on the optical recording medium is reproduced, the reproduction can be restricted when the reproduction permission information is not recorded in the semiconductor memory, and the reproduction management of the optical recording medium can be performed without restricting the recording capacity of the optical recording medium. Further, it becomes possible to easily switch between reproduction permission / prohibition and reproduction prohibition depending on whether or not the reproduction permission information is recorded in the semiconductor memory.

  Further, the present invention provides a media playback device for playing back information recorded on an optical recording medium, wherein when the optical recording medium includes a semiconductor memory, memory access means that can read the information recorded on the semiconductor memory; When the reproduction permission information is recorded in the semiconductor memory, reproduction determination means for determining that reproduction of the optical recording medium is permitted, and when reproduction of the optical recording medium is permitted, And media reproducing means for reproducing information recorded in the information recording area of the optical recording medium. According to this configuration, when the reproduction permission information is recorded in the semiconductor memory of the optical recording medium, it is determined that the reproduction of the optical recording medium is permitted, and the information recorded in the information recording area of the optical recording medium Therefore, when the reproduction permission information is not recorded in the semiconductor memory, the reproduction can be restricted, and the reproduction management of the optical recording medium can be performed without restricting the recording capacity of the optical recording medium.

  In the above configuration, encrypted information is recorded in the information recording area of the optical recording medium, and key information for decrypting the encrypted information is recorded in the semiconductor memory. When reproduction of the optical recording medium is permitted, it is preferable to decrypt the encrypted information based on the key information. According to this configuration, since the encrypted information is recorded in the information recording area of the optical recording medium, the reproducing apparatus that cannot read the information in the semiconductor memory can read only the encrypted information and obtain the key information. It is not possible to limit playback. Also, the key information can be managed by the management side of the optical recording medium.

In the above configuration, when the optical recording medium is reproduced without writing the reproduction permission information back to the semiconductor memory, information constituting a reproduction history is recorded in the semiconductor memory via the memory access means. It is preferable. According to this configuration, since the reproduction permission information is not written back to the semiconductor memory, the reproduction permission can be managed on the management side of the optical recording medium.
In addition, since the information constituting the playback history is recorded in the semiconductor memory, the traceability of the optical recording medium (the traceability of the playback status) is ensured by reading the information constituting the playback history from the semiconductor memory of the optical recording medium. can do. In this case, it is preferable that the information constituting the reproduction history includes at least one of reproduction date / time, the number of reproductions, and specific information for specifying the reproduced media reproduction apparatus.

  Further, the present invention provides an optical recording medium capable of restricting the reproduction of information recorded in the information recording area, recording encrypted information in the information recording area, and providing a semiconductor memory capable of non-contact communication, The semiconductor memory is characterized in that key information for decrypting the encrypted information is recorded and reproduction permission information is selectively recorded. According to this configuration, since the encrypted information is recorded in the information recording area and the key information is recorded in the semiconductor memory, the reproducing apparatus that cannot read the information in the semiconductor memory can read only the encrypted information and restrict the reproduction. Can do. In addition, since the reproduction permission information is selectively recorded in the semiconductor memory, it is possible to set the reproduction permission / prohibition of reproduction of the optical recording medium without limiting the recording capacity of the optical recording medium.

In the above configuration, it is preferable that the optical recording medium is an optical disk, and a loop antenna for non-contact communication is provided along the non-information recording area on the inner circumference side of the information recording area. According to this configuration, it is possible to suppress an increase in centrifugal force caused by the loop antenna while avoiding a situation where information in the information recording area cannot be read by the loop antenna.
In this case, it is preferable that an IC chip for non-contact communication and a weight for adjusting the rotation balance of the optical recording medium are further arranged in the information recording area. According to this configuration, an increase in centrifugal force can be suppressed while avoiding a situation where information in the information recording area cannot be read by the IC chip, and the rotation balance of the optical disk can be easily within an appropriate range.

  In the above configuration, the semiconductor memory is preferably a destructive read memory in which recorded information is lost when information is read, and is a memory that does not rewrite lost information. According to this configuration, when the reproduction permission information is read, the reproduction permission information disappears from the semiconductor memory, and the reproduction can be prohibited after reproduction of the optical recording medium unless the reproduction permission information is rewritten.

  In addition to being applied to the above-described media playback device, the present invention distributes a control program for carrying out the present invention to general users via an electric communication line, and distributes such a program to a magnetic recording medium, It can also be implemented in such a manner that it is stored in a computer-readable recording medium such as an optical recording medium or a semiconductor recording medium and distributed to general users.

  According to the present invention, a semiconductor memory capable of non-contact communication is provided on an optical recording medium, and reproduction permission information is selectively recorded on the semiconductor memory, and the media reproduction apparatus permits reproduction on the semiconductor memory of the optical recording medium. When the information is recorded, it is determined that the reproduction of the optical recording medium is permitted, and the information recorded in the information recording area of the optical recording medium is reproduced. Therefore, the reproduction permission information is recorded in the semiconductor memory. If not, playback can be restricted, and playback management of the optical recording medium can be performed without limiting the recording capacity of the optical recording medium.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a diagram showing an outline of a media playback system according to an embodiment of the present invention.
This media playback system 1 is used by a store (content supplier) 2 that provides a rental service of an optical disc (optical recording medium) 10 such as a CD or a DVD, and a user 3 that uses the rental service of the store 2. System.
The outline will be described. First, in the optical disc 10 used in the system 1, encrypted information obtained by encrypting contents such as music and video with an encryption key is recorded in an information recording area, which will be described in detail later. A memory 11 is provided so that non-contact communication is possible from the outside.

  The store 2 includes a management computer 4, and the management computer 4 is connected to a computer main body 4 </ b> A with a drive device 5. The drive device 5 can access the semiconductor memory 11 of the optical disk 10 without contact. It comprises. The management computer 4 executes a control program recorded in a hard disk device (not shown) in the computer main body 4A, thereby reading various information recorded in the semiconductor memory 11 by the drive device 5 to the display device 4B. A display function is provided, and when a regular rental procedure is performed, a function of writing predetermined reproduction permission information in the semiconductor memory 11 of the optical disc 10 is provided.

  The user 3 side includes a media playback device 20 corresponding to the media playback system 1. As shown in FIG. 1, the type of the media playback device 20 is a media playback device having a so-called single disk player configuration that outputs video and audio to a video and audio output device 21 such as a television with video output and audio output. 22 and a media playback device 24 having a personal computer configuration including a computer main body 24A and a display device 24B. Each of these media playback devices 22 and 24 includes a drive device 25 that reads information recorded in the information recording area of the optical disc 10 and has a non-contact communication function capable of accessing the semiconductor memory 11.

  When the above-described optical disc 10 is loaded in the drive device 25, the media playback device 20 reads information recorded in the semiconductor memory 11 of the optical disc 10, and playback is permitted when playback permission information is recorded. And the reproduction of the optical disc 10 is started according to the reproduction instruction of the user 3. On the other hand, when the reproduction permission information is not recorded, it is determined that the reproduction is not permitted, and the optical disk 10 is not reproduced even if the user gives a reproduction instruction. For this reason, reproduction is prohibited for an optical disc on which reproduction permission information is not recorded, in other words, an optical disc that has not undergone a regular rental procedure. In the case of this reproduction prohibited state, a notification process for displaying that fact and notifying an unauthorized user may be performed, or a forced ejection process for immediately ejecting the optical disk 10 from the drive device 25 may be performed.

Next, the optical disk 10 will be described in detail. FIG. 2 is a view of the optical disc 10 viewed from the information recording surface side, and FIG. 3 is a view of the optical disc 10 viewed from the label surface side.
The optical disc 10 is formed in accordance with a known optical disc standard, and includes a semiconductor memory 11 (see FIG. 3) in a non-information recording area AR2 on the inner circumference side of the information recording area AR1 of the optical disc 10. The non-contact communication IC chip 12, the loop antenna 13, and a balance adjusting weight 14 are provided.
More specifically, as conventionally known, the optical disc 10 has a laminated structure in which a recording layer (information recording area), a reflective layer, and the like are laminated between a pair of upper and lower transparent resins. The loop antenna 13 is spirally wound around the center of rotation of the optical disk 10 in the transparent resin-only area (non-information recording area AR2) on the inner periphery side. An IC chip 12 for non-contact communication is arranged on the front surface side (label surface side), and weights 14 are placed on the concentric circles of the optical disk 10 substantially the same as the IC chip 12 for non-contact communication so as to adjust the rotational balance of the optical disk 10. It is arranged. In this example, a case where a total of three weights 14 are arranged at intervals of 90 degrees with respect to the IC chip 12 for non-contact communication is illustrated. However, the present invention is not limited thereto, and the rotation balance can be adjusted to an appropriate range. Any change is possible.

The IC chip 12 for non-contact communication is a component in which various circuits for non-contact communication via the loop antenna 13 are integrated. The IC chip 12 allows the semiconductor memory 11 to communicate with the optical disk 10 from the outside in a non-contact manner. Provided.
As the semiconductor memory 11, a ferroelectric memory (FeRAM) which is a kind of nonvolatile memory is applied. Ferroelectric memory (FeRAM) has the characteristics that it can read and write at a higher speed than the conventionally widely used EEPROM, requires no refresh operation, consumes less power, and has a longer life, and This is a destructive read memory in which recorded information disappears when information is read. For this reason, once the information is read, the information disappears from the semiconductor memory 11 and can be read only once unless rewriting is performed.
Note that some conventional ferroelectric memories rewrite the read information so that the read information is not lost. However, the semiconductor memory of this configuration does not have a configuration for rewriting, so that It can be read once. The semiconductor memory 11 is not limited to the ferroelectric memory, and may be any destructive read memory in which recorded information disappears when information is read.

FIG. 4 is a diagram schematically showing the contents of the semiconductor memory 11.
As shown in this figure, the recording area of the semiconductor memory 11 includes a first area 11A for storing reproduction permission information, a second area 11B for storing management information, and a third area 11C for storing reproduction history information. Is assigned in advance, and the other free space 11D is set as a free region that can be arbitrarily used, for example. That is, information other than the content is stored in the semiconductor memory 11 so that the information recording area of the optical disc 10 can be allotted to the content storage area.
Each information stored in the semiconductor memory 11 will be described. The reproduction permission information is information indicating that reproduction is permitted. As described above, when the regular rental procedure is performed, the management of the store 2 is performed. Written by the computer 4.
Further, the management information is information unique to the optical disc, and specifically, identification information (ID) unique to the optical disc 10 and key information (encryption key) used for decrypting the encrypted information recorded on the optical disc 10. ) Is included. This management information may always be stored in the semiconductor memory 11 or may be appropriately written by the management computer 4 at the time of rental or the like.
The playback history information is information indicating the playback history of the optical disc 10, and includes any information such as the playback date and time, the management number of the device (media playback device 20) that played the optical disc 10, and the number of playbacks. Written by the played device.

Next, the media playback device 20 will be described. As shown in FIG. 1, the media playback device 20 includes a device 21 having a single disc player configuration and a device 22 having a personal computer configuration. These devices perform playback processing of the optical disc 10 using a dedicated hardware circuit. Although there is a difference in whether the processing is performed by software processing, the functional configuration is substantially the same, and hereinafter, description will be made assuming that the media playback device 20 is common except for a case where it is necessary to particularly distinguish.
FIG. 5 is a block diagram showing a functional configuration of the media playback device 20.
The media playback device 20 has an instruction input unit (instruction input means) 40 for inputting various instructions from the user 3 via an operation device such as a remote controller, a mouse, and a keyboard. This is a device that reproduces the optical disc 10 loaded in the device 20 in response to an instruction, and outputs an audio or video reproduction signal (audio signal, video signal) recorded on the optical disc 10 to the outside.

The optical disc 10 is loaded into the reproducing apparatus 20 by a loading mechanism (not shown) and clamped to the turntable 31. The turntable 31 is rotationally driven by the drive motor 32 via the drive unit 42 under the control of the control unit 41, and thereby the optical disc 10 is rotationally driven.
An optical pickup 33 is disposed in the vicinity of the turntable 31. The optical pickup 33 receives a laser diode that irradiates laser light toward the information recording area AR1 of the optical disc 10 and reflected light of the laser light. Equipped with a light receiving element and an optical system such as an objective lens for condensing the irradiated light and reflected light, and outputs an RF signal indicating the received light level of the reflected light of the laser light, a tracking error signal, and a focus error signal To do.

The optical pickup 33 is supported so as to be movable in the radial direction of the optical disc 10, and the radial position of the optical disc 10 is controlled (including tracking control) by the drive unit 42 under the control of the control unit 41. The focus control of the objective lens is performed. The configurations of the clamp mechanism, the optical pickup 33, and the drive unit 42 described above are the same as the conventional ones.
The playback unit (media playback means) 43 is for demodulating and playing back the information stored in the optical disc 20 from the RF signal output from the optical pickup 30 under the control of the control unit 41. The reproduction unit 43 having the configuration includes a decryption unit (decryption unit) 44 that performs decryption of the encrypted data by software processing or a hardware device when the demodulated data is encrypted data.
The output unit 45 performs digital / analog conversion of the output data of the reproduction unit 43 and outputs a known analog audio signal and video signal. The output unit 45 may be configured to output a known digital audio signal and video signal.

  The communication unit 46 functions as a memory access unit that accesses the semiconductor memory 11 of the optical disc 10 by non-contact communication, and includes an antenna 46A that is close to the loop antenna 13 of the optical disc 10, and a predetermined value is provided via the antenna 46A. By transmitting radio waves and receiving radio waves returned from the optical disk 10 via the antenna 46A, information recorded in the semiconductor memory 11 is read and information is written into the semiconductor memory 11. Note that a wide variety of known communication methods can be applied to this non-contact communication. By performing non-contact communication using radio waves in this manner, the semiconductor memory 11 can be read and written even when the optical disc 10 is being rotated, and the optical reading of the optical disc 10 is not affected.

The control unit (reproduction determination unit, reproduction control unit) 41 functions as a computer that controls the entire media playback device 20, and the storage unit 47 stores a management number unique to the media playback device 20 and an optical disk playback. The control unit 41 executes the control program stored in the storage unit 47 to control each unit of the media playback device 20 to perform playback processing, decoding processing, and the like of the optical disc 10. I do. In this configuration, each of the above-described configurations is built in the drive device 25 except for the control unit 41 and the storage unit 47 described above. However, the drive device 25 also includes the control unit 41 and the storage unit 47 without being limited thereto. You may do it.
The media playback device 20 is not limited to playback of the optical disk 10 including the semiconductor memory 11 described above, and can also play back known optical disks such as CDs, CD-ROMs, and DVDs. In order to distinguish clearly, the optical disk 10 provided with the semiconductor memory 11 will be described as a reproduction management type optical disk 10, and a known optical disk will be described as a conventional optical disk 10X.

Next, the operation of the media playback device 20 will be described. FIG. 6 is a flowchart showing the operation when the optical disc is loaded, and FIG. 7 is a flowchart showing the operation when the optical disc reproduction is instructed.
As shown in FIG. 6, when an optical disc (whether it is a reproduction management type optical disc 10 or a conventional type optical disc 10X) is loaded in the media playback device 20, the control unit 41 starts an optical disc discrimination process (step S1). In this optical disc discrimination process, the control unit 41 tries communication with the optical disc by the communication unit 46, and determines whether or not communication is possible depending on the presence or absence of a response (step S2).

When communication is possible (step S2: YES), the control unit 41 determines that the reproduction management type optical disc 10 is used, and reads information recorded in the semiconductor memory 11 of the optical disc 10 by non-contact communication (step S3). . At this time, the control unit 41 reads at least the first area 11A of the semiconductor memory 11 and determines whether or not the reproduction permission information has been acquired (step S4).
When the reproduction permission information is acquired (step S4: YES), the control unit 41 writes a flag indicating reproduction permission (reproduction permission flag) in a predetermined area of the storage unit 47 (step S5), and the semiconductor memory 11 The second area 11B is read, key information is acquired and stored in the storage unit 47.

On the other hand, when the reproduction permission information cannot be acquired in the determination in step S4 (step S4: NO), the control unit 41 determines that the optical disk 10 is not permitted to reproduce, and stores a flag indicating that reproduction is prohibited (reproduction prohibition flag). The data is written in a predetermined area of the unit 47 (step S7). That is, in the case of the optical disc 10 for which a regular rental procedure has not been performed, the reproduction prohibition flag is set in the storage unit 47. In this case, the control unit 41 performs a notification process for notifying that reproduction is prohibited by voice or video (step S8), and notifies the user to that effect.
Information (character information, video information, audio information, etc.) used for the notification process is stored in the free space 11D of the semiconductor memory 11 of the optical disk or stored in the storage unit 47 of the media playback device 20. Is applicable.

  If the loaded optical disk is the conventional optical disk 10X, the control unit 41 determines that contactless communication is not possible in the determination process of step S2 (step S2: NO), and the process proceeds to step S9. The reproduction permission flag is written in the storage unit 47. Here, the case where the conventional optical disc 10X is loaded is a case where an optical disc owned by the user is loaded instead of being rented. In such a case, it is not preferable to restrict reproduction, and thus reproduction is permitted. Is. The above is the processing when the optical disk is loaded.

After the above processing, the control unit 41 waits for an instruction input by the user via the instruction input unit 40. When the instruction is input, the control unit 41 determines whether or not it is an optical disc ejection instruction as shown in FIG. 7 (step S11). ). In the case of an optical disk ejection instruction, the control unit 41 performs an optical disk ejection process and clears the setting of the flag indicating reproduction permission / reproduction prohibition stored in the storage unit 47 (step S12).
If the input instruction is not an optical disk ejection instruction, the control unit 41 determines whether or not an instruction relating to reproduction such as a reproduction instruction or a menu display instruction other than the reproduction instruction in the case of DVD has been input (step S41). S13) In the case of other instructions (step S13: NO), after executing the process corresponding to the instruction, it waits for the next instruction input.

When an instruction related to reproduction is input (step S13: YES), the control unit 41 refers to the reproduction permission / prohibition flag stored in the storage unit 47 (step S14), and the reproduction permission flag is set. If yes (step S15: YES), the playback unit 43 executes playback processing (including menu display) according to the instruction (step S16). In this reproduction process, when the loaded optical disk is the reproduction management type optical disk 10, the encrypted information is read from the information recording area, and the decryption unit 44 performs the decryption process with the key information obtained in advance. Can be unlocked and played back. In the case of the conventional optical disc 10X, the reproduction process is performed without using the decoding unit 44.
When playing back the playback management type optical disc 10, the control unit 41 reads the third area 11C of the semiconductor memory 11 by the communication unit 46 to acquire playback history information, and sets the playback count in the playback history information. 1 is added, the playback date and time, and the management number of the playback device 20 are added, and this information is written in the third area 11C of the semiconductor memory 11 (step S17). Thereby, the reproduction history information in the semiconductor memory 11 can be appropriately updated.

  On the other hand, in the determination in step S15, when the regeneration permission flag is not set (step S15: NO), that is, when the regeneration prohibition flag is set, the control unit 41 performs various instructions regarding the regeneration. No reproduction processing is performed even if is input (step S18). As a result, the reproduction management type optical disc 10 can be reproduced only when the reproduction permission information is recorded, and the reproduction can be restricted when the reproduction permission information is not recorded. The above is the operation of the media playback device 20.

As described above, according to the present embodiment, the encrypted information is recorded in the information recording area AR1 on the optical disc 10, so that the encrypted information can be reproduced even if the optical disc 10 is reproduced by a general-purpose disc reproducing apparatus. It can only be read and cannot be played back on the device, and the content content cannot be read even if the contents information is viewed, thereby preventing unauthorized use and playback of the content. .
In addition, since the semiconductor memory 11 is provided on the optical disc 10 so as to be capable of non-contact communication, and reproduction permission information is selectively recorded in the semiconductor memory 11, reproduction permission / reproduction prohibition is performed depending on the presence or absence of the reproduction permission information. Can be easily switched.

In addition, since the key information for decrypting the encryption information of the optical disk 10 is recorded in the semiconductor memory 11, the key information can be acquired only by the dedicated media playback device 20 having an access function to the semiconductor memory 11. Therefore, it becomes possible to decrypt and reproduce only by the media reproducing apparatus 20.
In addition, when information is read from the semiconductor memory 11, the recorded information is lost, a destructive read memory that does not rewrite the lost information is used, and the media playback device 20 does not write back the playback permission information. Therefore, when the above-mentioned reproduction permission information is read, the reproduction permission information disappears from the semiconductor memory 11, and unauthorized reproduction after reproduction of the optical disc 10 can be prevented. Thus, management of key information and reproduction permission / non-permission can be collectively managed on the management side (store 2 side) of the optical disc 10.

  Further, since the reproduction history information is stored in the semiconductor memory 11, the traceability of the optical disc 10 (the possibility of tracing the reproduction status) can be ensured by referring to this information. Further, since all information other than the content information is recorded in the semiconductor memory 11, the information recording area AR1 of the optical disc 10 can be used only for the content information. Therefore, reproduction management such as prevention of unauthorized reproduction of the optical disk 10 can be appropriately performed without using the recording capacity of the optical disk 10 for information other than the content.

  Further, in this configuration, the semiconductor memory 11, the non-contact communication IC chip 12 and the loop antenna 13 are disposed in the non-information recording area AR2 on the inner circumference side of the information recording area AR1 of the optical disc 10, so that information is provided by these components. While avoiding the situation where the information in the recording area AR1 cannot be read, an increase in centrifugal force due to these components can be suppressed. In addition, since the balance adjusting weight 14 is disposed in the non-information recording area AR2, the rotational balance of the optical disk 10 can be easily within an appropriate range.

  In addition, this invention is not limited to the above-mentioned embodiment, The deformation | transformation in the range which can achieve the objective of this invention, improvement, etc. are included in this invention. For example, in the above-described embodiment, the case where the present invention is applied to the rental service of the optical disk 10 has been described. However, the present invention is not limited to this, and the present invention can be widely applied to the case where information management within a company is performed using an optical disk.

Further, in the above-described embodiment, when it is desired to further enhance the reproduction management, the media reproduction apparatus 20 is input with the identification information of the viewer (user 3), and the identification information of the viewer is included in the reproduction history information. May be. Further, the media playback device 20 may be provided with a biometric authentication function for authenticating whether or not the viewer is permitted to browse in advance, and when authenticated, various operations such as a playback instruction may be accepted. Alternatively, a password may be input, and various operations may be accepted only when the password matches that registered.
In other words, in this configuration, it is possible to appropriately change according to the degree of management importance such as how much playback management and security should be strengthened. For example, when only playback restriction is performed, recording of playback history information is omitted. May be.

Furthermore, in the above-described embodiment, it is also possible to record confidential information and caution notation that are disclosed only to the contractor in the free area 11D of the semiconductor memory 11 of the optical disc 10, and to display these cautions during playback. .
Conventionally, in rental stores, product information (new product information and similar products) and sales promotion information (point sales, discounts) may be provided to rental users. Such information is stored in the semiconductor memory 11. It may be recorded in the free space 11D so that the rental user can display it appropriately.
In the above-described embodiment, since the key information is recorded in the semiconductor memory 11 of the optical disc 10, the key information can be managed on the optical disc 10 management side (store 2 side), but the present invention is not limited to this. For example, when the key information can be managed on the user side, the recording of the key information in the semiconductor memory 11 is omitted, the key information is held on the media playback device 20 side, and the playback permission information is stored in the semiconductor memory 11. May be decrypted and played back by the media playback device 20 using the key information.

  Further, in the above-described embodiment, the case where the control program executed by the media playback device 20 is stored in the storage unit 47 in the device in advance has been described. However, this control program can be stored in a magnetic recording medium, an optical recording medium, or a semiconductor. The program may be stored in a computer-readable recording medium such as a recording medium, and the computer may read and execute the control program from the recording medium. The control program may be downloaded from a distribution server on the communication network.

1 is a schematic diagram of a media playback system according to an embodiment of the present invention. It is the figure which looked at the optical disk from the information recording surface side. It is the figure which looked at the optical disk from the label surface side. It is a figure which shows the content of a semiconductor memory typically. It is a block diagram which shows the function structure of a media reproduction apparatus. It is a flowchart which shows the operation | movement at the time of optical disk loading. It is a flowchart which shows operation | movement at the time of an optical disk reproduction | regeneration instruction | indication.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Media reproduction system, 5, 25 ... Drive apparatus (memory access means), 10 ... Optical disk (optical recording medium), 11 ... Semiconductor memory (ferroelectric memory (FeRAM)), 12 ... IC chip for non-contact communication, DESCRIPTION OF SYMBOLS 13 ... Loop antenna, 14 ... Weight, 20, 22, 24 ... Media reproduction apparatus, 33 ... Optical pick-up, 40 ... Instruction input part (instruction input means), 41 ... Control part (Reproduction determination means, reproduction control means), 42 ... Driving unit 43. Reproducing unit (media reproducing unit) 44. Decoding unit (decoding unit) 45. Output unit 46. Communication unit (memory access unit) 46 A. Antenna 47.

Claims (9)

In a media playback system for playing back optical recording media with a media playback device,
A semiconductor memory capable of contactless communication with the optical recording medium is provided, and reproduction permission information is selectively recorded on the semiconductor memory,
The media playback device includes:
Memory access means capable of reading information recorded in the semiconductor memory;
Reproduction determination means for determining that reproduction of the optical recording medium is permitted when the reproduction permission information is recorded in the semiconductor memory;
A media playback system, comprising: media playback means for playing back information recorded in an information recording area of the optical recording medium when playback of the optical recording medium is permitted. In a media playback device for playing back information recorded on an optical recording medium,
When the optical recording medium includes a semiconductor memory, memory access means that can read information recorded in the semiconductor memory;
Reproduction determination means for determining that reproduction of the optical recording medium is permitted when the reproduction permission information is recorded in the semiconductor memory;
A media playback device, comprising: media playback means for playing back information recorded in an information recording area of the optical recording media when playback of the optical recording media is permitted. The media playback apparatus according to claim 2, wherein
Encryption information is recorded in the information recording area of the optical recording medium, and key information for decrypting the encryption information is recorded in the semiconductor memory,
The media playback device, wherein the media playback means decrypts the encrypted information based on the key information when playback of the optical recording media is permitted. The media playback device according to claim 2 or 3,
When the optical recording medium is reproduced without writing the reproduction permission information back to the semiconductor memory, information constituting a reproduction history is recorded in the semiconductor memory via the memory access means. Media playback device. The media playback device according to claim 4, wherein
The information constituting the reproduction history includes at least one of reproduction date and time, the number of reproductions, and specific information for identifying the reproduced media reproduction device. In an optical recording medium capable of limiting the reproduction of information recorded in the information recording area,
The encryption information is recorded in the information recording area, and a semiconductor memory capable of contactless communication is provided. The key information for decrypting the encryption information is recorded and the reproduction permission information is selected in the semiconductor memory. An optical recording medium characterized by being recorded. The optical recording medium according to claim 6,
The optical recording medium is an optical disk, and a loop antenna for non-contact communication is provided along the non-information recording area on the inner circumference side of the information recording area. The optical recording medium according to claim 6 or 7,
An optical recording medium, wherein the semiconductor memory is a destructive read memory in which recorded information is lost when information is read, and the lost information is not rewritten. In a control program for controlling a media playback device for playing back optical recording media by a computer,
When the optical recording medium includes a semiconductor memory, the information recorded in the semiconductor memory is read,
When the reproduction permission information is recorded in the semiconductor memory, it is determined that reproduction of the optical recording medium is permitted,
A control program for reproducing information recorded in an information recording area of the optical recording medium when reproduction of the information is permitted.

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