JP5564933B2 - Content protection system, mobile terminal and wireless device - Google Patents

Description

  The present invention relates to content protection and viewing restrictions when passengers use a mobile terminal to view content such as movies in a passenger cabin such as a passenger aircraft, and in particular to prevent unauthorized removal of the content. The present invention relates to a content protection system, a mobile terminal, and a wireless device suitable for the mobile phone.

  Services that provide entertainment content such as music and movies to passengers in passenger aircraft are widespread. Conventionally, these services transmit content by wire or wirelessly to a display device attached to the back of the passenger seat, and each passenger views desired content by channel selection or on-demand request operation. Similar services are also implemented in trains.

  In addition to the system that provides and plays back content using the network laid in the guest room in this way, the portable device such as a so-called portable hard disk player or DVD player is lent to the portable terminal and desired package media. It is also possible to provide content services. By playing content on a mobile device, there is no need to install a large dedicated network in the aircraft, there is no need to install an expensive video server or transmitter, and because the content is packaged media, handling and software replacement Is advantageous in that it is advantageous in screen size and image quality compared to a seat-mounted display device.

  However, because of its portability, there is a risk that the terminal will be illegally taken out of the machine and content may be illegally viewed, illegally distributed, or illegally duplicated. As is well known, many of the terrestrial cinema pre-opening works are screened on international passenger aircraft, and the motives for unauthorized use are sufficiently present. Therefore, for mobile terminals for content reproduction used in aircraft, it is desirable to take sufficient measures to prevent the unauthorized use described above.

  Further, in the aircraft, it is necessary to follow the instructions of the pilot and crew (hereinafter referred to as PA) for various communications and emergencies. In the case of a service using a network laid in the cabin, a countermeasure is taken to stop all entertainment systems at the time of PA, and a similar countermeasure is desired for a portable terminal.

  Technologies that can be used for this purpose are described in Patent Document 1 and Patent Document 2.

  In Patent Document 1, in order to enable content playback on a mobile phone only within a station premises, when passing through an automatic ticket gate when entering a station, a playback key is transmitted to the mobile phone, and when leaving the station, Similarly, an automatic ticket gate deletes the playback key stored in the mobile phone. As a result, the user can operate his / her own mobile phone as a dedicated content playback apparatus only within the station. On the other hand, since the reproduction key is deleted when leaving the station, the content cannot be reproduced and the content can be protected.

  Further, in Patent Document 2, an ID and entry time information are transmitted to a mobile device at a gate when the mobile device enters the specific area so that the mobile device can receive a specific service only in the specific area. When this mobile device makes a service request, the ID is confirmed, and whether or not it is within a predetermined time from the entrance time is confirmed, and the service use of this mobile device is permitted. As a result, the mobile device can receive a dedicated service within a specific area, and its authority disappears after a certain period of time, so that use outside the area is effectively prohibited and content can be protected.

International Publication No. 2006/009158 JP 2005-149303 A

  As described above, in order to play back dedicated content or receive a dedicated service only within a specific area, given information is given to the mobile terminal at the time of entering the area, and the information is owned In the meantime, the function of the portable terminal can be made effective.

  However, if the technique of Patent Document 1 or Patent Document 2 is applied to a portable terminal in an aircraft that is the subject of the present invention, it can be understood that the technique cannot be used due to the following two problems. First, in both Patent Document 1 and Patent Document 2, it is assumed that the terminal carried by the individual is originally owned by the individual and is always carried, and is necessary at the entrance gate when bringing the terminal into a specific area. This is the point that information is written. The portable terminal used in the present invention is assumed to be used exclusively in an aircraft and is not the property of the user. Therefore, the user does not bring it into the specific area (in the aircraft) but always exists in the specific area. Therefore, the operation itself of writing predetermined information at the gate at the time of entrance cannot be performed.

  Secondly, there is a problem with the method of terminating a given function. In Patent Document 1, predetermined information is deleted at a gate when leaving a specific area. In Patent Document 2, the function validity period is determined based on time information, and the function is stopped. Both are the same in that necessary information is once written in the portable terminal. It is not technically difficult for an unauthorized person to prevent the written information from being erased or to modify the time information to extend the validity period as much as possible. If the profits obtained by this are sufficiently large, full-scale remodeling may be profitable. Since mobile terminals for in-flight services as in the present invention can also watch movies before opening as is well known, if the contents can be taken out of the plane, extremely large income can be obtained by illegal copying or the like. is there.

  The present invention has been made to solve the above-described problems, and detects radio waves transmitted in an aircraft when content such as a movie provided in an aircraft is played on a portable terminal dedicated for use in the aircraft. The purpose of the present invention is to provide a content protection system, a mobile terminal, and a wireless device that can enable the playback function only in the cabin and immediately and automatically stop the playback function against unauthorized removal of the mobile terminal. To do.

In order to achieve the above object, a content protection system of the present invention is a content having a wireless reception function, including at least one mobile terminal that reproduces content, and a wireless device that transmits a wireless signal to the mobile terminal. A protection system in which a wireless device broadcasts a data packet including specific information to a mobile terminal, the mobile terminal receives the data packet, and continuously receives the specific information included in the data packet Ri can der reproduction of the content only, the wireless device transmits broadcast to the mobile terminal the data packet including the identification information at a predetermined period, a serial number of the specific information is a wireless device, at least one of manufacturer information wherein, and wherein the Rukoto included in the header of the data packet.

With such a configuration, it is possible to realize a highly secure content protection system with a simple configuration even when a passenger uses a mobile terminal to view unpublished content in a cabin such as a moving body. it can. Furthermore, it is possible to control the reproduction of content on the mobile terminal simply and reliably using the periodicity of the packet including the specific information transmitted from the wireless device. Furthermore, since the serial numbers and manufacturer names of radio devices installed in passenger aircraft are information that ordinary passengers cannot know, using such specific information makes it easy to use without special information. The content can be protected.

The content protection system of the present invention has a radio receiving function, and at least one mobile terminal to reproduce the content, a content protection system having a wireless device that sends a radio signal to the mobile terminal, radio The device broadcasts a data packet including specific information to the mobile terminal, and the mobile terminal receives the data packet and reproduces the content only during a period in which the specific information included in the data packet is continuously received. The wireless device broadcasts the data packet including the specific information to the mobile terminal at a predetermined cycle, the wireless device is a wireless LAN access point, and the data packet is a beacon signal, specific information is characterized SSID der Rukoto included in the beacon signal.

With such a configuration, it is possible to realize a highly secure content protection system with a simple configuration even when a passenger uses a mobile terminal to view unpublished content in a cabin such as a moving body. it can. Furthermore, it is possible to control the reproduction of content on the mobile terminal simply and reliably using the periodicity of the packet including the specific information transmitted from the wireless device. Furthermore, it is possible to configure a highly reliable and low-cost system using products that are already widely used.

  In the content protection system of the present invention, the specific information may further include the MAC address of the wireless device included in the data packet.

  With such a configuration, since the MAC address information of the wireless device is used in addition to the SSID, it is possible to further increase the safety.

  In the content protection system of the present invention, the mobile terminal may be able to reproduce content only when a wireless signal is received at a predetermined signal strength or higher.

  With such a configuration, it is possible to prevent the function of the mobile terminal from becoming effective due to leaked radio waves to the outside.

  The content protection system of the present invention further includes a management server that is connected to the wireless device via a network and centrally manages the mobile terminal via the wireless device, and the management server sends the interrupt request command to the mobile terminal when the interrupt request command is received. A playback stop command may be issued. Further, the management server may control not to distribute the specific information to the mobile terminal via the wireless device when the interrupt request command is received.

  With such a configuration, when a pilot or a crew member performs a PA operation, the operation of the mobile terminal is stopped, so that all passengers do not miss the PA and a safer operation is possible.

  The content protection system of the present invention may be installed in a passenger aircraft. With such a configuration, it is possible to safely protect content such as a movie that is screened in a passenger aircraft before it is opened at a movie theater on the ground.

A mobile terminal according to the present invention is a content protection system having a wireless reception function and comprising at least one mobile terminal that reproduces content and a wireless device that transmits a wireless signal to the mobile terminal. Content that can be played back only during a period in which a data packet containing information is broadcast to the mobile terminal, the mobile terminal receives the data packet, and continuously receives the specific information contained in the data packet A mobile terminal included in a protection system, a radio receiving unit that receives a radio signal from a radio device, a feature detection unit that detects a feature of a radio signal received by the radio receiving unit, and a content storage unit that accumulates content When the operation means for operating the mobile terminal and the feature detection means continuously detect the specific information, the operation means accepts the operation from the operation means. Characterized in that it comprises a regeneration control means for controlling to reproduce the content from the Ceiling storage means.

  According to the present invention, when a content such as a movie provided on an aircraft is played on a portable terminal dedicated for use on the plane, the playback function is enabled only on the plane by detecting the radio wave transmitted in the plane. Therefore, it is possible to provide a content protection system, a mobile terminal, and a wireless device that can immediately and automatically stop the playback function against unauthorized removal of a mobile terminal.

The figure which shows schematic structure of the content protection system in the 1st Embodiment of this invention The block diagram which shows the basic structural example of the content protection system in the 1st and 3rd embodiment of this invention The block diagram which shows the basic structural example of the content protection system in the 2nd Embodiment of this invention The figure for demonstrating operation | movement of the content protection system in the 2nd Embodiment of this invention. The block diagram which shows the structural example which implement | achieves the reliability improvement of the portable terminal in embodiment of this invention

  Hereinafter, a content protection system according to an embodiment of the present invention will be described with reference to the drawings.

(First embodiment)
First, a first embodiment of the present invention will be described with reference to FIG. 1 and FIG. FIG. 1 is a diagram showing a schematic configuration of a content protection system according to the present embodiment. Seats 1 and 4 are arranged in the front and rear in passenger aircraft cabin area 101, and a passenger (not shown) seated on seat 4 uses portable terminal 120 lent by an airline, for example, a front seat. The content such as a movie is reproduced while being placed on the table 2 of 1 and viewed using the image display unit 123 such as a liquid crystal display and the headphones 3. This content may be stored in advance on a hard disk of the mobile terminal 120 or may be provided by an airline company using a package-type recording medium (package medium) such as an optical disk (for example, DVD) or a semiconductor memory card. . A wireless device 110 is installed, for example, on the ceiling in the guest room area 101, and the mobile terminal 120 includes an antenna 128 for receiving radio waves transmitted from the wireless device 110. The portable terminal 120 can reproduce the content only while receiving a predetermined radio wave (packet or the like) described later in detail from the wireless device 110. The wireless device 110 is connected to the management server 150 via an Ethernet (registered trademark) cable 140. The management server 150 centrally manages each portable terminal 120 used in the aircraft via the wireless device 110, stops reproduction of the portable terminal 120 at the time of announcement for passengers, calls a flight attendant from the passengers, and the like. Is being processed.

  FIG. 2 is a block diagram showing a basic configuration example of the content protection system according to the present embodiment. An example of the internal configuration of the mobile terminal 120 will be described with reference to FIG. Content such as a movie is stored in the content storage unit 121. Specific examples are the above-described DVD, a semiconductor memory card, or a hard disk that downloads and stores contents from the outside. For these contents, image information is displayed on the image display unit 123 via the reproduction control unit 122, and audio information is output from the audio output unit 124 to the external headphones 3. When the content is supplied in the form of package media, special measures are taken so that the package media can be normally played back only on the portable terminal 120 provided by the airline. For example, the content is encrypted, and a decryption key for decrypting the encryption is stored in the mobile terminal 120. A user operation for reproducing or stopping the content from the content storage unit 121 is performed on the operation unit 127, and the operation result is sent to the reproduction control unit 122.

  On the other hand, the wireless reception unit 125 selectively receives radio waves from the wireless device 110, and the feature detection unit 126 detects and determines whether the contents of the radio waves match a predetermined one. When it is determined that the received radio wave is predetermined, an instruction is issued to the playback control unit 122 to enable the playback function based on the determination result. In addition, when a predetermined feature is no longer detected by the feature detection unit 126 during playback, the playback control unit 122 is instructed to stop the playback function.

  Next, feature detection of the transmitted radio wave from the wireless device 110 will be described. Since the service provider provides a detailed understanding of the specifications of the wireless device 110, there are many characteristics of the transmitted radio wave. Typical examples are the transmission frequency, the modulation method, and the header format of the transmission data packet. In particular, specific information that only the operator can know is embedded in the header of the transmission data packet and transmitted. As this information, manufacturer information such as a manufacturer name of the wireless device 110, a manufacturing number (serial number), or the like can be used. The feature detection unit 126 can detect that the information is received under the reception environment of the regular wireless device 110 when it is detected using this specific information as a condition and has been continuously received for a certain period of time. As for the above “a certain time or longer”, the longer the reliability, the higher the reliability of detection, but conversely, the operability (reaction rate) as seen by the user decreases, so it is considered that several seconds is appropriate. Needless to say, the detection is continuously performed after detection, and if the radio wave is interrupted, the reproduction control unit 122 is instructed to stop the function.

  As described above, according to the present embodiment, mobile terminal 120 receives radio waves of a specific method that can be received only in an aircraft from radio apparatus 110 and specific information (manufacturer name, serial number, etc.) about radio apparatus 110. It is controlled so that the internal content can be played back only while it is playing. As a result, even when the portable terminal 120 or the package medium on which the content is recorded is stolen, the content cannot be reproduced outside the aircraft, so that the content can be safely protected.

  Next, an operation related to viewing restriction of the content protection system in the present embodiment will be described. Normally, when a PA operation is performed by a pilot or a crew member, the management server 150 immediately stops the playback via the wireless device 110 to each portable terminal 120 upon receipt of a PA start (interrupt request) command. Issue a command.

  On the other hand, the mobile terminal 120 receives a wireless packet at the wireless reception unit 125, and transmits the reproduction stop command from the feature detection unit 126 to the reproduction control unit 122. The playback control unit 122 that has received the playback stop command immediately stops playback of the content.

  As described above, according to the content protection system of the present embodiment, in addition to the function of safely protecting the content of the mobile terminal 120, the function of stopping the operation of the mobile terminal 120 during the PA operation by the pilot or the crew is also realized. can do. As a result, all passengers will not miss the PA and safer navigation will be possible.

  Furthermore, the operation when the wireless device 110 fails will be described.

  If the wireless device 110 fails, it cannot be delivered even if a reproduction stop command is issued from the management server 150 to each mobile terminal 120.

  However, if the control method is such that internal content can be played back only while receiving specific information or a specific type of radio wave from the wireless device 110 according to the present invention, if the wireless device 110 fails, it is specified. Since no information is transmitted, the content cannot be reproduced in the first place. That is, as a result, the operation of the portable terminal 120 can be stopped during the PA operation by a pilot or a crew member, so that all passengers do not miss the PA, and safer operation is possible.

  In the above embodiment, the case where the specific information is embedded in the header of the transmission data packet has been described as an example. However, the present invention is not limited to the header itself, and the same effect can be expected even when information is multiplexed in the packet.

  In the above embodiment, when a PA operation by a pilot or a crew member is performed, a playback stop command is transmitted from the management server to the mobile terminal 120, but the viewing restriction is not a playback stop command, The same effect can be expected by not transmitting the specific information for reproducing the content only to the portable terminal 120 during the PA period.

  In the above embodiment, the case where one wireless device is installed is described as an example. However, the number of installed devices is not limited to one, and even when a plurality of wireless devices are installed. Similar effects can be expected.

(Second Embodiment)
Next, a radio transmission system according to the second embodiment of the present invention will be described with reference to FIGS. FIG. 3 is a block diagram showing an example of the basic configuration of the content protection system according to the present embodiment. Since the system configuration of FIG. 3 is the same as that of FIG. 2, the same components are denoted by the same reference numerals and the description thereof is omitted. FIG. 4 is a diagram for explaining the operation of the content protection system according to the present embodiment. FIGS. 4 (a) and 4 (c) are diagrams showing key information to be transmitted, and FIG. 4 (b) and FIG. 4 (e) is a diagram showing a reproduction control signal of the reproduction control unit 122, and FIG. 4 (d) is a diagram showing a time window. In the first embodiment, the feature detection of the transmission radio wave performed by the feature detection unit 126 is performed by collating the transmission frequency, the modulation method, and the header format of the transmission data packet. These are basic specifications of the radio signal. Therefore, when the wireless device 110 having the same specification is copied relatively easily and the portable terminal 120 is taken out of the apparatus, the copy is made. There remains a possibility that the playback function is validated outside the apparatus by the wireless device.

  Therefore, in the present embodiment, as shown in FIG. 3, common key information is given in advance to radio apparatus 110 and portable terminal 120, and radio apparatus 110 packetizes this key information and periodically transmits it to portable terminal 120. Keep doing. When the feature detection unit 126 of the mobile terminal 120 detects the feature of the received radio wave, the key information is collated. If this key information is regularly updated and used, a highly secure system can be obtained. The key information can be written via an electrical contact, wirelessly, or by inserting a semiconductor memory such as a memory card. For example, a plurality of types of key information may be stored in the management server 150, transmitted to the wireless device 110 via the Ethernet (registered trademark) cable 140, and further wirelessly transmitted from the wireless device 110 to the portable terminal 120. Good. Here, the key information is special information that only the airline can know, and is special information that can be set independently by the airline. For example, information generated from a random number generated by a random number generator or the like that generates a random number having a sufficiently large number of digits (difficult to estimate) may be used. Alternatively, a decryption key may be used that encrypts the content and stores it in the content storage unit 121 of the mobile terminal 120 and decrypts the encrypted content.

  The key information is periodically transmitted from the wireless device 110 at time intervals T as shown in FIG. The time interval T is set to about several seconds, for example. The feature detection unit 126 of the mobile terminal 120 authenticates whether or not the received key information is authentic by comparing with the own key information stored in advance. As shown in FIG. 4B, the reproduction control unit 122 stands by in a reproduction prohibited state. When a predetermined number (for example, five) is received continuously after receiving the normal key information 131 for the first time, the reproduction control unit 122 is notified of this. The playback control unit 122 sets the content to be playable after receiving the key information 132. In this state, when the user operates the operation unit 127 to instruct content reproduction, the reproduction control unit 122 starts reproduction of the content stored in the content storage unit 121. The playback control unit 122 continuously plays back the content while receiving the key information. Finally, after receiving the key information 134, if the predetermined number (for example, three) of key information that should be received is not continuously received, the playback control unit 122 sets the content playback to a prohibited state. At this time, if the content is being reproduced, the reproduction is immediately stopped.

  Actually, when the radio wave condition in the guest room area 101 is poor, due to a reception error or the like, the key information that should be originally received may not be received even though it is transmitted. The correspondence in such a case will be described with reference to FIGS. 4 (c) to 4 (e). After receiving the key information 131 for the first time, the playback control unit 122 may set a predetermined time window 137 and set it to a playable state when a predetermined number of pieces of key information are received within the time window 137.

For example, as shown in FIG. 4D, a time window 137 having a width of 5T <T _W <6T is set immediately after the key information 131, and, for example, four or more pieces of key information are stored in the time window 137. When it is received (after receiving the key information 133), it may be in a playable state. In this way, it is determined that reproduction is possible even when the key information 136 that should have been received due to a reception error or the like cannot be received. Thereby, even when the reception state of the radio wave from the wireless device 110 is unstable, the content of the portable terminal 120 can be stably reproduced.

  As described above, according to the present embodiment, wireless device 110 and portable terminal 120 share the same key information, and portable terminal 120 reproduces content only while portable terminal 120 is receiving this key information. Enable. Therefore, even if the portable terminal 120 or the medium containing the content is stolen in the aircraft, the content cannot be reproduced, and the content can be surely protected.

  Next, an operation related to viewing restriction of the content protection system in the present embodiment will be described. In a normal case, when a PA operation is performed by a pilot or a crew member, the management server 150 immediately stops playback of each mobile terminal 120 via the wireless device 110 upon receipt of a PA start (interrupt request) command. Issue a command.

  On the other hand, the mobile terminal 120 receives a wireless packet at the wireless reception unit 125, and transmits the reproduction stop command from the feature detection unit 126 to the reproduction control unit 122. The playback control unit 122 that has received the playback stop command immediately stops playback of the content.

  As described above, according to the content protection system of the present embodiment, in addition to the function of safely protecting the content of the mobile terminal 120, the function of stopping the operation of the mobile terminal during the PA operation by the pilot or the crew can be realized. . As a result, all passengers will not miss the PA and safer navigation will be possible.

  Furthermore, the operation when the wireless device 110 fails will be described.

  If the wireless device 110 fails, it cannot be delivered even if a reproduction stop command is issued from the management server 150 to each mobile terminal 120.

  However, if the control method is such that the internal content can be reproduced only while the key information from the wireless device 110 according to the present invention is periodically received, the key information is not stored if the wireless device 110 fails. Since it is not received regularly, the content cannot be reproduced in the first place. That is, as a result, the operation of the portable terminal 120 can be stopped during the PA operation by a pilot or a crew member, so that all passengers do not miss the PA, and safer operation is possible.

  In the above description, it is assumed that the mobile terminal 120 can play back content only while the mobile terminal 120 is receiving key information. However, not only playback but also operations such as stop, pause, fast forward, and fast reverse May be possible. In this case, all operations are prohibited when the mobile terminal 120 has not received the key information. That is, all the operation keys may be invalidated.

  In the above embodiment, the case where one wireless device is installed is described as an example. However, the number of installed devices is not limited to one, and even when a plurality of wireless devices are installed. Similar effects can be expected.

(Third embodiment)
Next, a third embodiment of the present invention will be described. In the configuration of FIG. 2, it is possible to use a wireless LAN access point (so-called parent device) that has already been standardized and widely used as the wireless device 110. As is well-known, IEEE802.11a / b / g / n is defined in the 2.4 GHz band or 5 GHz band, and a communication distance of several tens of meters is possible at a transmission speed of several tens of Mbps to several hundreds of Mbps. . Many products have already been sold in Japan, and compatibility between manufacturers within the same system is ensured.

  By using such a wireless LAN system in an aircraft, it is possible to provide a wide range of services such as mutual communication between crew members, Internet connection to personal computers owned by passengers, in-flight music, and networks for providing movie distribution services. It becomes possible. If a wireless LAN has already been used in the aircraft for such a purpose, it is extremely efficient to use the access point of this wireless LAN as the wireless device 110 shown in FIG. This is because the additional device cost is minimized and a mechanism unique to the wireless LAN can be easily used for feature detection of received radio waves.

  As is well known, in a wireless LAN system, a beacon signal is output between the access point and the slave unit for initial setting of communication, and the mobile terminal 120 continuously detects the beacon signal. It can be determined that the wireless device 110 is in a receiving environment of the access point of the regular wireless LAN. Further, since the beacon signal includes information for setting an individual network name for each access point called SSID (Service Set Identifier), this should be used as the key information described in the second embodiment. Is possible. Further, since the MAC address of the access point is added as the source address to the transmission data packet including the beacon signal, the authentication safety can be ensured by using the MAC address of the access point in addition to the SSID for authentication of this radio wave. Can increase the sex. The period of the beacon signal can be set freely to some extent, but is often set to about 100 ms, for example.

  In the first to third embodiments described above, by performing signal strength detection in addition to signal feature detection, it is possible to protect in-flight content with higher safety. This is because radio waves transmitted from the in-flight wireless device 110 may leak outside the aircraft. Since the aircraft body is made of metal, it has a shielding property against radio waves, but it is not always sufficient because of the influence of openings such as windows. There is a possibility that the portable terminal 120 illegally taken out of the apparatus may activate the playback function with such weakly leaking radio waves.

  Therefore, as shown in FIG. 5, not only the feature detection unit 126 performs feature detection on the output signal from the wireless reception unit 125 but also whether or not the strength of the radio wave received by the signal strength detection unit 129 exceeds a certain threshold value. It is desirable to instruct the reproduction control unit 122 not to validate the reproduction function if it is below the threshold. Setting a certain strength standard for the strength of the received radio signal is not only effective for improving the safety of the system as described above, but also for ensuring the reliability of the communication data quality of the radio signal. Therefore, system operation with few malfunctions can be realized.

  As described above, according to the content protection system of the embodiment of the present invention, the stored content can be played back only when the mobile terminal 120 receives specific information from the wireless device 110, and the specific information When the mobile terminal 120 or the content storage medium is stolen, the content can be safely protected.

  In addition, although the said embodiment demonstrated the use in a passenger aircraft as an example, it can utilize also for the content service in the guest room of other mobile bodies, such as a train. It can also be used for applications other than mobile objects such as theaters.

  The present invention aims to prevent illegal use of movie and music content that can be viewed on a mobile terminal, and can be widely used not only in passenger aircraft but also in passenger cabins such as trains. .

1, 4 seats 2 tables 3 headphones 101 (passenger aircraft) cabin area 110 wireless device 120 portable terminal 121 content storage unit 122 playback control unit 123 image display unit 124 audio output unit 125 wireless reception unit 126 feature detection unit 127 operation unit 128 Antenna 129 Signal strength detector 131-136 Key information 137 Time window 140 Ethernet (registered trademark) cable 150 Management server

Claims (10)

At least one portable terminal that has a wireless reception function and reproduces content;
A content protection system comprising a wireless device for transmitting a wireless signal to the portable terminal,
The wireless device broadcasts a data packet including specific information to the mobile terminal,
The mobile terminal receives the data packet, Ri can der reproduction of the content only during a period in which continuously receives the specific information contained in the data packet,
The wireless device broadcasts the data packet including the specific information to the mobile terminal at a predetermined cycle,
The specific information includes at least one of a serial number of the wireless device and manufacturer information,
Content protection system according to claim Rukoto included in the header of the data packet. At least one portable terminal that has a wireless reception function and reproduces content;
A content protection system comprising a wireless device for transmitting a wireless signal to the portable terminal,
The wireless device broadcasts a data packet including specific information to the mobile terminal,
The mobile terminal receives the data packet, and can reproduce the content only during a period in which the specific information included in the data packet is continuously received,
The wireless device broadcasts the data packet including the specific information to the mobile terminal at a predetermined cycle,
The wireless device is an access point of a wireless LAN, the data packet is a beacon signal, wherein the to Turkey content protection system that said specific information is SSID contained in the beacon signal. The content protection system according to claim 2 , wherein the specific information further includes a MAC address of the wireless device included in the data packet. The content protection system according to any one of claims 1 to 3 , wherein the portable terminal is capable of reproducing content only when the wireless signal is received at a predetermined signal strength or higher. . A management server that is connected to the wireless device via a network and that centrally manages the portable terminal via the wireless device; and when the management server receives an interrupt request command, the management server sends a playback stop command to the portable terminal. The content protection system according to any one of claims 1 to 4 , wherein the content protection system is issued. 6. The content protection system according to claim 5 , wherein the management server performs control not to distribute the specific information to the mobile terminal via the wireless device when receiving an interrupt request command. The content protection system according to any one of claims 1 to 6 , wherein the content protection system is installed in a passenger aircraft. A content protection system having at least one portable terminal that has a wireless reception function and reproduces content, and a wireless device that transmits a wireless signal to the portable terminal, the wireless device including data including specific information The packet is broadcast to the mobile terminal, and the mobile terminal receives the data packet, and can play back the content only during a period in which the specific information included in the data packet is continuously received. A mobile terminal included in the content protection system,
Wireless receiving means for receiving the wireless signal from the wireless device;
Feature detection means for detecting characteristics of the wireless signal received by the wireless reception means;
Content storage means for storing the content;
Operating means for operating the mobile terminal;
A movement characterized by including reproduction control means for receiving an operation from the operation means and controlling to reproduce the content from the content storage means when the characteristic detection means continuously detects the specific information. Terminal. Wireless device included in the content protection system according to any one of claims 1-7. A management server included in the content protection system according to claim 5 or 6 .

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