KR20100001045A - System for preventing illegal utilization of broadcasting contents in iptv broadcasting service and method thereof - Google Patents

Abstract

PURPOSE: A system for preventing illegal utilization of broadcasting contents in an IPTV broadcasting service and a method thereof are provided to encode only partial data using a feature of an MPEG-2 TS format, thereby preventing illegal utilization of broadcasting contents. CONSTITUTION: A stream server(100) receives broadcasting contents from a broadcasting provider. The stream server generates an encoded data stream of the first specification and an encoded data stream of the second specification. A wired network server(200) offers the encoded data stream of the first specification to a wired subscriber terminal.

Description

SYSTEM FOR PREVENTING ILLEGAL UTILIZATION OF BROADCASTING CONTENTS IN IPTV BROADCASTING SERVICE AND METHOD THEREOF}

The present invention relates to a system and a method for preventing illegal use of broadcast contents in an IPTV broadcasting service. More particularly, the present invention relates to a low specification encrypted data stream that can be decrypted and reproduced by a low specification wireless communication terminal. A system and method for preventing illegal use of broadcast content in an IPTV broadcast service.

With the spread of the Internet and the development of digital broadcasting technology, the use of two-way broadcasting services provided by high-speed Internet networks is increasing.

Two-way broadcasting service is a service that provides information service, video content, and broadcasting to a two-way broadcasting receiver (for example, an IPTV (Internet Protocol Television), a DMB receiver, a set-top box, etc.) by using high-speed Internet. Various contents and additional services provided by the Internet such as movie watching, home shopping, home banking, online games, and MP3 can be provided.

In particular, in the IPTV broadcasting service, there are many types of services that can store and store broadcast contents in various user terminals such as PCs, PMPs, and mobile phones, or in central storage. there was.

To solve this problem, the IPTV broadcasting service encrypts the broadcasting content using a content protection solution such as Digital Rights Management (DRM) or Conditional Access System (CAS), and then the user terminal through the IP network. To provide.

However, in the related art, since the broadcast server encrypts the broadcast content and multicasts it, anyone who has access to the network can watch and illegally copy the broadcast content stored in the system and distribute it illegally. there was.

In order to solve this problem, a technique for multicasting encrypted content in a stream server has been proposed.

However, the conventional method uses a method of encrypting all the stream data. In this case, a large amount of encrypted data requires special hardware or a terminal equipped with a high-performance CPU to solve the encryption. In particular, there is a problem that it is difficult to apply in a mobile device with low CPU performance.

On the other hand, in order to provide broadcast content to a wireless communication terminal of a user who is permitted to view broadcast content in an IPTV broadcast service, the broadcast content must be converted into a low-specified encrypted data stream that can also be used by low-end terminals. There is a problem that wireless cannot provide an integrated IPTV broadcasting service.

An embodiment of the present invention provides a system and method for preventing illegal use of broadcast content that can prevent illegal use of broadcast content in an IPTV broadcast service.

In addition, an embodiment of the present invention provides a system and method for preventing illegal use of a content integrated with wired / wireless that can generate and decrypt a low-specified encrypted data stream that can be used even in a low-end wireless communication terminal that is permitted to view broadcast content. To provide.

Accordingly, the present invention provides a system and method for preventing illegal use of broadcast content by encrypting only a part of data without encrypting all data using characteristics of the MPEG-2 TS format.

As a technical means for achieving the above technical problem, a first aspect of the present invention is a system for preventing illegal use of broadcast content in an IPTV broadcast service, by receiving broadcast content from a broadcaster to encrypt data of a first specification A stream server for generating a stream and an encrypted data stream of the second specification, a wired network server receiving the encrypted data stream of the first specification and providing the encrypted data stream to a wired subscriber station, and receiving the encrypted data stream of the second specification. A wireless network server providing the wireless communication terminal to the wireless communication terminal, wherein the encrypted data stream of the second specification is generated during the generation of the encrypted data stream of the first specification. do.

As a technical means for achieving the above technical problem, a second aspect of the present invention is a method for preventing illegal use of broadcast content in an IPTV broadcasting service, the method comprising: receiving broadcast content from a broadcaster, the received broadcast content To encrypt the data stream of the first specification and the data stream of the second specification, providing the encrypted data stream of the first specification to a wired subscriber station, and wirelessly encrypting the encrypted data stream of the second specification. Providing to the communication terminal, wherein the encrypted data stream of the second specification is generated in the process of generating the encrypted data stream of the first specification.

As a technical means for achieving the above-described technical problem, a third aspect of the present invention, in a user terminal for playing an encrypted data stream, receiving the encrypted data stream to extract the I frame to decrypt the extracted I frame A user comprising a cryptographic analysis unit, a first buffer unit for recombining the I-frame decrypted data stream, a stream decoder for decoding the decrypted data stream, and a display unit for displaying the decoded data stream on a content reproduction screen. Provide a terminal.

According to one of the aforementioned problem solving means of the present invention, an IPTV broadcasting service system in which wired / wireless is integrated by generating a low-specified encrypted data stream that can be effectively decrypted and used even in a low-end terminal environment having a low-performance CPU. Can be implemented.

Further, according to one of the other problem solving means of the present invention, IPTV is more efficient because it uses a low-specified encrypted data stream that can be used even in a wireless communication terminal of a user who is permitted to view broadcast content to prevent illegal use of the broadcast content. A broadcast service system can be implemented.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Throughout the specification, when a part is "connected" to another part, this includes not only "directly connected" but also "electrically connected" with another element in between. . In addition, when a part is said to "include" a certain component, which means that it can further include other components, except for the other components unless otherwise stated.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic configuration diagram of a general IPTV broadcasting service system.

Referring to FIG. 1, an IPTV broadcasting system includes a broadcaster 1000, a headend system 2000, a network network 3000, and a user terminal 4000.

In addition, the headend system 2000 includes a baseband system 2010, a compression multiplexing system 2020, a conditional access system (CAS) 2030, a back office system 2040, a monitoring system 2050, A media management core (MOC) 2060, a subscriber management system 2070, a data broadcasting system 2080, an electronic program guide (EPG) system 2090, and a return path server system 2100.

The broadcaster 1000 serves to produce, edit, and change broadcast content to provide to the headend system 2000. The broadcaster 1000 may include a program provider (PP), a terrestrial wave, or a content provider (CP). In addition, the broadcast content provided by the broadcaster 1000 may include existing broadcast content and rich content on the Internet.

The headend system 2000 receives and manages broadcast content from the broadcaster 1000 and distributes content to the user terminal 4000 to provide broadcast / recording / playback services. The received broadcast content may include related additional information and an EPG for such additional information.

The head-end system 2000 includes EPG information (PSIP / PSI /) including a subscriber concentrator, a broadcast video and audio signal, data broadcasting data, and a program recommendation service menu through a router supporting a multicast routing protocol. SI information) can be transmitted to IP set-top boxes of multiple subscribers by multicasting.

The baseband system 2010 receives an MPEG2 broadcast signal from an external program provider (PP) or an analog broadcast signal from terrestrial waves, converts the received source broadcast signal into a SDI (Serial Digital Interface) signal, and converts a frame ( Frames), and distributes video and audio signals from multiple broadcast channels (e.g. 100 channels) via a routine switcher, subtitle generator (CG) and automatic program controller (APC). At least one of an advertisement, a logo, or a subtitle is inserted into the broadcast video and audio signal (signal editing and processing) and transmitted to the compression multiplexing system 2020.

The SDI (Serial Digital Interface) signal is, for example, a digital signal standard having a transmission rate of 270 Mbps, and a composite digital video and four channels of digital audio signals may be mixed.

The baseband system 2010 is basically a tuner for receiving analog broadcast signals through a receiving device (eg, a DS-3 station, a Yagi antenna, and an IRD) for receiving broadcast signals such as a program provider (PP) and terrestrial waves, respectively. (Tuner)), a frame synchronizer for converting and correcting a source signal received from a receiving device into an SDI signal, synchronizing frames, and connecting / centralizing all broadcast signal channels for operation management. A signal divider such as an A / V router and a subtitle generator for inserting an advertisement, a logo, and a subtitle into the SDI signal to edit and process the signal may be included.

The compression multiplexing system 2020 uses an A / V encoder (A / V Encoder) for broadcasting video and audio signals (Video, Audio) received from the baseband system 2010 for each broadcasting channel (eg, 100 channels). ) To compress the SDI (Serial Digital Interface) video signal to H.264, and to compress the audio signal to MPEG-2 AAC to generate MPEG-2 TS (Transport Stream), and to compress compressed broadcast video and audio -2 after multiplexing data broadcasting data and EPG information (PSIP / PSI / SI information) generated by a data encoder and a PSI / SI generator together with the TS signal When the received MPEG-2 TS signal is used in the reception restriction technique, the TS-2 may be inputted to a scrambler, encrypted, and finally IP packetized to transmit an IP packetized TS (Transport Stream) broadcast signal.

Also, optionally, the reception restriction system 2030 may be used to prevent illegal viewing and illegal copying of program recommended content.

The reception restriction system 2030 performs encryption of the real-time channel and pre-encryption of the VOD content, and controls viewing authority so that only the authenticated user can use the channel and the content. In order to prevent illegal copying of IPTV contents, a digital rights management (DRM) scheme may be used instead of the reception restriction system 2030.

The back office system 2040 is a provisioning system and provides a billing processing function for the use of the IPTV program service for each subscriber.

The monitoring system 2050 is a control system. The monitoring system 2050 may monitor a transmission failure of an A / V broadcast signal for IPTV broadcasting, a reception failure by monitoring a downlink of an IPTV headend system, and confirm subtitles.

The media management system 2060 is a system that manages various business process information (program organization information, location information, contract information, product information, etc.) for operating a broadcasting business. The media management system 2060 integrates and manages the information flow through organic coupling with each system in the center of the broadcasting center.

The media management system 2060 manages broadcast program organization information, content and media management information, contract information of a program provider (PP) and a content provider (CP), and product information, and manages each system in the center of a broadcasting center. Through organic integration, it can act as a coordinator to manage and manage the flow of information.

In addition, the media management system 2060 includes contract management, media and content metadata management, EPG information acquisition / management as broadcast schedule information, and real time broadcasting and VOD in terms of operation. It provides channel formation management, agent management, interworking with each subsystem, VOD catalog creation management, and various product management.In terms of analysis, marketing analysis reporting, delivery such as settlement of CP / CA, subscriber viewing propensity, etc. In terms of broadcasting transmission monitoring, video server transmission management and VOD subscriber authentication, transmission result recording / management for settlement with CP / CA, and data synchronization with each subsystem connected.

The subscriber management system 2070 provides membership registration and termination and member information management for IPTV services.

The data broadcasting system 2080 authors, verifies, organizes, and transmits the data broadcasting data.

The data broadcasting system 2080 includes a data agent manager (PSI) for managing data encoding, a PSI / SI generator (PSI) for generating program specific information / service information (SI). / SI Generator), Data Server / Data Encoder for encoding data broadcasting data into broadcast video and audio signals, and Multiplexer Manager for managing multiplexing functions of data into the broadcast video and audio signals Manager) and a scheduler user interface (Scheduler UI).

In addition, the data broadcasting system 2080 may use the A / V encoder to provide the A / V data provided from the A / V server according to the terrestrial Application Configuration Access Protocol (ACAP) data broadcasting standard. Compresses the broadcast video and audio signals by using a data server / data encoder and PSI / SI (Program Specific Information / Service Information), and compresses the compressed video and audio signals from an application by the authoring tool. ) Is multiplexed by a multiplexer together with data broadcasting data and EPG information (PSIP / SI information) generated by the generator to encode and transmit broadcast program data and related information from the collection and storage of data broadcasting programs. .

The EPG system 2090 includes an EPG server and provides an electronic program guide (EPG) service to the user terminal 4000.

The return path server system 2100 processes bidirectional data by a data provider (DP), provides online bill transfer from the user terminal 4000, usage history / billing interworking processing of bidirectional data, and personalization authentication processing. , And receive bidirectional data for the program recommendation service and transmit the corresponding response data to the user terminal 4000 in unicasting.

The network 3000 receives the broadcast content from the headend system 2000 and delivers the received broadcast content to the user terminal 4000. The network network 3000 includes a backbone network and an access network, and the access network includes Ethernet, xDSL (ADSL, VDSL), Hybrid Fiber Coaxial Ca (HFC), and Fiber To The Curb), and may be configured in any one topology of a fiber to the home (FTTH) structure.

The user terminal 4000 is an apparatus for using an Internet broadcasting service, and generally includes an IPTV, a set top box (STB), and a remote controller. The IPTV outputs broadcast content received from the headend system 2000 and transmits a user response signal received through the remote controller to the headend system 2000 through a return channel of the set top box.

The user terminal may use any one of a TV with an IP STB or an IP set-top box (IP STB), a computer, a notebook, or a personal portable terminal connected to the user's TV.

The IP set-top box includes a hardware layer composed of STB hardware such as a CPU, a media processor, flash RAM, and an Ethernet module, a system software layer including a system driver such as a device driver and an operating system, a Java Virtual Machine (JVM), Middleware layer with Conditional Access System (CAS) module and Digital Rights Management (DRM) interface module, streaming protocol (RTP, RTSP), MPEG2, MPEG4, MPEG7, H.264, WMV- It may include four layers of an application layer that supports various multi codecs such as 9 and includes an electronic program guide (EPG) for selecting an IPTV service channel. In this case, the subscriber's IP set-top box may be assigned an IPv4 address or an IPv6 address.

Hereinafter, a system and method for preventing illegal use of broadcast content in an IPTV broadcast service according to an embodiment of the present invention will be described with reference to FIGS. 2 to 6.

2 is a diagram illustrating a connection relationship between a system for preventing illegal use of broadcast content according to an embodiment of the present invention.

Referring to FIG. 2, the network configuration of the system for preventing illegal use of broadcast content according to an embodiment of the present invention includes a stream server 100, a wired network server 200, a wireless network server 300, and a plurality of subscriber terminals ( 400 and a plurality of wireless communication terminals 500.

The stream server 100 receives a broadcast content from a broadcaster and converts the broadcast content into a high specification encrypted data stream and a low specification encrypted data stream to allow the user to view the broadcast content and the subscriber terminal 400 and the wireless communication terminal 500. ) Provides streaming service.

Here, a high-end encrypted data general encryption technology, that is, a video stream that encrypts all the I frame, B frame, P frame of the video to encrypt and transmit and decrypt in a high-speed communication environment and high-end terminal environment smoothly Refers to a generated data stream. Meanwhile, the low specification encrypted data stream is a low specification encrypted video stream that encrypts only I frames of the video and is an encrypted data stream so that transmission and decryption can be performed smoothly even in a low speed communication environment and a low specification terminal environment. In particular, each of the low specification encrypted data streams is transmitted on a channel for low speed data streams with low bandwidth allocation.

The wired network server 200 receives a high specification encrypted data stream and a low specification encrypted data stream from the stream server 100 and transmits the encrypted data stream to the subscriber station 400. The high specification encrypted data stream and the low specification encrypted data stream may be transmitted in a multicast manner to, for example, a plurality of subscriber stations 400.

The wireless network server 300 receives the encrypted data stream of the low specification from the stream server 100 and transmits it to the wireless communication terminal 500. The low specification encrypted data stream may be transmitted, for example, to a plurality of wireless communication terminals 500 in a multicast manner.

The subscriber station 400 decrypts the high specification encrypted data stream and the low specification encrypted data stream received from the wired network server 200 and displays the encrypted data stream on the content playback screen. That is, when a high specification encrypted data stream is received from the wired network server 200, the subscriber station 400 decrypts all I frames, B frames, and P frames of the data stream and displays them on the content playback screen. When a low specification encrypted data stream is received from the server 200, only the I frame of the data stream is decrypted and displayed on the content playback screen. In this case, the content playback screen refers to a screen on which broadcast content is played.

The subscriber station 400 includes, for example, a set-top box (STB) as well as a personal computer, a notebook, a kiosk, a low specification wireless terminal, and the like.

Since the subscriber station 400 receives and decrypts a low-specified encrypted data stream generated by the stream server 100, the subscriber terminal 400 can easily decrypt and display video content by using a low-spec CPU.

The wireless communication terminal 500 decrypts the low specification encrypted data stream received from the wireless network server 300 and displays the encrypted data stream on the content playback screen. That is, the wireless communication terminal 500 decrypts only the I frame of the low specification encrypted data stream received from the wireless network server 300 and displays it on the content playback screen.

The wireless communication terminal 500 is a wireless communication terminal of a user who is allowed to reproduce broadcast contents. For example, the wireless communication terminal 500 includes a mobile phone, a PDA, an Ultra Mobile PC (UMPC), a tablet PC (Tablet PC), and the like, which are capable of wireless communication. .

Since the wireless communication terminal 500 can receive and decrypt a low-specified encrypted data stream generated by the stream server 100, the wireless communication terminal 500 can easily decrypt and display video content using a low-spec CPU.

Accordingly, the low specification encrypted data stream generated by the stream server 100 may be decrypted and displayed in the subscriber station 400 of the user who is permitted to use the broadcast content. The low-frequency wireless communication terminal 500 that is permitted to use broadcast contents may be easily decoded and displayed, thereby enabling a more efficient IPTV broadcasting service system.

3 is a detailed configuration diagram of a stream server according to an embodiment of the present invention.

Referring to FIG. 3, the stream server 100 according to an embodiment of the present invention includes an encryption unit 110, a first TS buffer unit 120, and a multicasting stream transmission unit 130. 110 performs UDP packet receiver 111, TS packet extractor 112, TS packet parser 113, encryption determiner 114, second TS buffer 115 and TS packet encryptor 116. Include.

The encryption unit 110 encrypts the digital broadcast content received from the broadcaster and provides the encrypted content to the first TS buffer unit 120. That is, the encryption unit 110 encrypts all I frames, B frames, and P frames in order to convert the digital broadcasting content received from the broadcaster into a high specification encrypted data stream, or converts the digital broadcast content into a low specification encrypted data stream. You can also encrypt only I frames.

The UDP packet receiver 111 receives broadcast content provided as a UDP (User Datagram Protocol) packet from a broadcaster and transmits it to the TS packet extractor 112.

The TS packet extracting unit 112 extracts a TS packet from the received UDP packet and transmits the TS packet to the TS packet parser 113.

The TS packet parser 113 analyzes the extracted TS packet into I frames, B frames, and P frames, and transmits the TS packets to the encryption determiner 114.

The encryption determining unit 114 determines whether the TS packet analyzed by the I frame, the B frame, or the P frame is encrypted and transmits the encrypted TS packet to the second TS buffer unit 116 when encrypted. The packet is transmitted to the TS packet encryption unit 115.

The TS packet encryptor 115 encrypts the unencrypted TS packet transmitted from the encryption determiner 114 and transmits the encrypted TS packet to the second TS buffer unit 116. That is, the TS packet encryptor 115 encrypts all I frames, B frames, and P frames of the TS packet to generate a high-specified encrypted data stream, or extracts only I frames to generate a low-specified encrypted data stream. Encrypt

The second TS buffer unit 116 stores the encrypted TS packet transmitted from the encryption determination unit 114.

The first TS buffer unit 120 receives each of the high specification encrypted data stream and the low specification encrypted data stream from the encryption unit 110 so that each of the subscriber terminal 400 and the wireless communication terminal 500 can decrypt them. The data stream is readjusted and transmitted to the multi casting stream transmitter 230.

The multicasting stream transmitter 130 transmits a low specification encrypted data stream to the subscriber station 400 and the wireless communication terminal 500 so that the multicasting stream transmitter 130 can be used in the wireless communication terminal 500. In addition, the multicasting stream transmitter 130 transmits the high specification encrypted data stream and the low specification encrypted data stream to the subscriber station 400 to be used in the subscriber station 400.

In this case, the high-definition encrypted data stream may be displayed and decrypted as the video content in the subscriber terminal 400, and the low-specific encrypted data stream is decoded as the video content in the user terminal 400 and the wireless communication terminal 500. Can be displayed.

In addition, the low-specified encrypted data stream may be used to decrypt the EPG screen in the subscriber terminal 400. In this case, the subscriber terminal 400 decrypts the mosaic EPG screen including a plurality of videos with a low load and then the video. To play back and display.

In addition, the low specification encrypted data stream generated by the stream server 100 is used not only to decrypt the EPG screen in the subscriber terminal 400 but also in the user's wireless communication terminal 500 that is permitted to view broadcast content. As it can be decoded and reproduced immediately, a more efficient IPTV broadcasting service system can be implemented.

4 is a detailed configuration diagram of a wireless communication terminal for easily decrypting a low specification encrypted data stream according to an embodiment of the present invention.

Referring to FIG. 4, the wireless communication terminal 500 according to an embodiment of the present invention includes an encryption analyzer 510, a buffer 520, a stream decoder 530, and a display 540. The analyzing unit 510 uses the UDP packet receiving unit 511, the TS packet extracting unit 512, the TS packet parser 513, the encryption determining unit 514, the TS packet encryption analyzing unit 515, and the buffer 516. Include.

The encryption analyzer 510 receives the low-specified encrypted data stream generated by the stream server 100 from the wireless network server 300, decrypts only I frames of the data stream, and transmits the data stream to the first buffer unit 520. .

The UDP packet receiving unit 511 receives the encrypted low-specified data stream generated by the stream server 100 as a UDP (User Datagram Protocol) packet and transmits it to the TS packet extracting unit 512.

The TS packet extracting unit 512 extracts a TS packet from the UDP packet received from the UDP packet receiving unit 511 and transmits the TS packet to the TS packet parser 513.

The TS packet parser 513 interprets the TS packets extracted from the TS packet extractor 512 into I frames, B frames, and P frames, and transmits the TS packets to the encryption determiner 514.

The encryption determining unit 514 determines whether to encrypt the I frame of the TS packet analyzed by the TS packet parser 513, and if it is encrypted, transmits it to the TS packet encryption analyzing unit 515, and encrypts it. Otherwise, transmits to the second buffer 516.

The TS packet encryption analysis unit 515 decrypts only the I frame of the encrypted TS packet received from the encryption determination unit 514 and transmits the decrypted I frame to the second buffer 516.

The second buffer 516 stores the TS packet in which only I frames are decoded.

The first buffer 520 recombines the TS packet decrypted by only the I frame from the encryption analyzer 510 and transmits the TS packet to the stream decoder 530.

The stream decoding unit 530 decompresses the stream of the TS packet received from the first buffer 520 and transmits the decompressed stream to the display unit 540. That is, the stream decoding unit 530 decodes the low-decoded data stream so as to be decoded and reproduced in the low-end wireless communication terminal 500 and transmits the decoded data stream to the display unit 540.

The display unit 540 displays the low-decoded data stream received from the stream decoding unit 530 on the content reproduction screen.

As described above, the wireless communication terminal 500 according to an embodiment of the present invention can decode broadcast content and moving picture mosaic EPG using a low-specified encrypted data stream and display the content on the content playback screen.

5 is a flowchart illustrating a method of preventing illegal use of broadcast content according to an embodiment of the present invention.

In step S11, the stream server 100 receives the digital broadcast content from the broadcaster, and then proceeds to step S12 to encrypt the received broadcast content.

In step S13, the stream server 100 encrypts all I frames, B frames, and P frames of the broadcast content to generate a high specification encrypted data stream, and then proceeds to step S14, where the I frames of the broadcast content are present. Encrypt only to create a low-specified encrypted data stream.

In step S15, the stream server 100 receives a request for transmission of broadcast content from the subscriber terminal 400 of a user who is permitted to view the broadcast content, and then proceeds to step S16, where the encrypted data stream of the high specification is specified. Alternatively, the low-end encrypted data stream is transmitted to the wired network server 200.

In step S17, the wired network server 200 transmits the high specification encrypted data stream or the low specification encrypted data stream received from the stream server 100 to the subscriber station 400.

In step S18, the subscriber station 400 decrypts the high specification encrypted data stream or the low specification encrypted data stream received from the wired network server 200, and then proceeds to step S19 to decrypt the decrypted data stream. Is displayed in real time on the content reproduction screen as broadcast content.

In step S20, the stream server 100 receives a request for transmitting broadcast content from the wireless communication terminal 450 of the user who is permitted to view the broadcast content, and then proceeds to step S21 to encrypt the low-specified data. The stream is transmitted to the wireless network server 300.

In operation S22, the wireless network server 300 transmits the low-specified encrypted data stream received from the stream server 100 to the wireless communication terminal 500.

In step S23, the wireless communication terminal 500 decrypts the low-specified encrypted data stream received from the wireless network server 300, and then proceeds to step S24 to play the decrypted data stream as broadcast content. Display in real time on the screen.

6 is a flowchart illustrating a method of generating an encrypted data stream for preventing illegal use of broadcast content according to an embodiment of the present invention.

In step S31, the stream server 100 receives digital broadcast content provided as a User Datagram Protocol (UDP) packet from a broadcaster.

In step S32, the stream server 100 extracts a TS packet from the UDP packet received from the broadcaster, and then proceeds to step S33, and analyzes the extracted TS packet into I frames, B frames, and P frames.

In step S34, the stream server 100 determines whether each frame of the TS packet is encrypted. If not, the stream server 100 proceeds to step S35 to encrypt the unencrypted TS packet. At this time, the stream server 100 may encrypt the unencrypted TS packet by encrypting all I frames, B frames, and P frames to generate a high specification encrypted data stream, or by encrypting only the I frame to generate a low specification encrypted data stream. have.

7 is a flowchart illustrating a method of decrypting a low specification encrypted data stream in a wireless communication terminal according to an embodiment of the present invention.

In step S41, the wireless communication terminal 500 receives a low-specified encrypted data stream generated in the stream server 100 from the wireless network server 300 as a User Datagram Protocol (UDP) packet.

In step S42, the wireless communication terminal 500 extracts a TS packet from a UDP packet received from the wireless network server 300, and then proceeds to step S43 to convert the extracted TS packet into an I frame. Analyze with B frames and P frames.

In step S44, the wireless communication terminal 500 determines whether to encrypt the I frame of the analyzed TS packet, and if it is encrypted, proceeds to step S45 to extract and decrypt only the I frame of the TS packet. do.

In step S46, the wireless communication terminal 500 recombines and decodes TS packets decoded in only I frames, and then proceeds to step S47 to display the low-decoded data stream on the content reproduction screen.

As described above, since the wireless communication terminal 500 according to an embodiment of the present invention receives the low data encrypted data stream and decrypts and reproduces only the I frame, the wireless communication terminal 500 uses the low specification CPU to upgrade the broadcast content. Can play. In addition, the wireless communication terminal 500 may decode the video mosaic EPG screen using a low specification encrypted data stream and display the content on the content playback screen.

One embodiment of the present invention can also be implemented in the form of a recording medium containing instructions executable by a computer, such as a program module executed by the computer. Computer readable media can be any available media that can be accessed by a computer and includes both volatile and nonvolatile media, removable and non-removable media.

The foregoing description of the present invention is intended for illustration, and it will be understood by those skilled in the art that the present invention may be easily modified in other specific forms without changing the technical spirit or essential features of the present invention. will be. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as distributed may be implemented in a combined form.

The scope of the present invention is shown by the following claims rather than the above description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. do.

1 is a schematic configuration diagram of a general IPTV broadcasting service system.

2 is a diagram illustrating a connection relationship between a system for preventing illegal use of broadcast content according to an embodiment of the present invention.

3 is a detailed configuration diagram of a stream server according to an embodiment of the present invention.

4 is a detailed configuration diagram of a wireless communication terminal for easily decrypting a low specification encrypted data stream according to an embodiment of the present invention.

5 is a flowchart illustrating a method of preventing illegal use of broadcast content according to an embodiment of the present invention.

6 is a flowchart illustrating a method of generating an encrypted data stream for preventing illegal use of broadcast content according to an embodiment of the present invention.

7 is a flowchart illustrating a method of decrypting a low specification encrypted data stream in a wireless communication terminal according to an embodiment of the present invention.

Claims (12)

In the system for preventing illegal use of broadcast content in IPTV broadcasting service, A stream server that receives broadcast content from a broadcaster and generates an encrypted data stream of a first specification and an encrypted data stream of a second specification, A wired network server receiving the encrypted data stream of the first specification and providing the encrypted data stream to a wired subscriber station; Including a wireless network server for receiving the encrypted data stream of the second specification to provide to a wireless communication terminal, The encrypted data stream of the second specification is generated in the process of generating the encrypted data stream of the first specification. The method of claim 1, And encrypting the second specification encrypts only I frames of the broadcast content. The method of claim 2, The stream server may include an encryption unit configured to receive digital broadcast data from a broadcaster and encrypt the encrypted data stream of the first specification and the encrypted data stream of the second specification; A first TS buffer unit for rebalancing the encrypted data stream of the first specification and the encrypted data stream of the second specification into Transport Stream (TS) packets; A multicasting stream transmitter for transmitting the encrypted data stream of the first specification and the second specification of the encrypted data stream rescheduled into the TS packet through a multicasting channel; System for preventing illegal use of broadcast content comprising a. The method of claim 3, wherein The encryption unit, A UDP packet receiver for receiving broadcast content provided as a UDP (User Datagram Protocol) packet from a broadcaster; A TS packet extracting unit extracting a TS packet from the received UDP packet; A TS packet parser for analyzing the extracted TS packets into I frames, B frames, and P frames; An encryption determination unit that determines whether to encrypt TS frames, which are interpreted as the I frames, B frames, and P frames, for each frame; A TS packet encryption unit for encrypting the unencrypted TS packet; A second TS buffer unit for storing the encrypted TS packet System for preventing illegal use of broadcast content comprising a. The method of claim 4, wherein And the encryption determining unit transmits the TS packet to the second TS buffer unit if the TS packet is encrypted and transmits the TS packet to the TS packet encryption unit if the TS packet is not encrypted. The method of claim 1, The wired network server receives the encrypted data stream of the second specification and provides it to the wired subscriber station, The encrypted data stream of the first specification provided to the subscriber station is decrypted in the subscriber station and displayed on a content playback screen, and the encrypted data stream of the second specification provided to the subscriber station is decrypted in the subscriber station and mosaicd. The illegal use prevention system of broadcast content which is displayed in an EPG screen. In the method for preventing illegal use of broadcast content in IPTV broadcasting service, Receiving broadcast content from a broadcaster, Encrypting the received broadcast content into a data stream of a first specification and a data stream of a second specification, Providing an encrypted data stream of the first specification to a wired subscriber station; and Providing an encrypted data stream of the second specification to a user's wireless communication terminal; Including but not limited to: The encrypted data stream of the second specification is generated during the generation of the encrypted data stream of the first specification. The method of claim 7, wherein The encryption step of the broadcast content, Extracting a TS packet from a UDP packet received from the broadcaster; Interpreting the extracted TS packets into I frames, B frames, and P frames to determine whether to encrypt the TS packets for each frame; Encrypting a TS packet in which the TS packet is not encrypted Method for preventing illegal use of broadcast content comprising a. The method of claim 7, wherein And encrypting the second specification encrypts only I frames of the broadcast content. A user terminal for playing an encrypted data stream, An encryption analysis unit which receives the encrypted data stream, extracts an I frame, and decrypts the extracted I frame; A first buffer unit for recombining the decoded data stream of only the I frame; A stream decoding unit for decoding the decoded data stream; A display unit for displaying the decoded data stream on the content playback screen User terminal comprising a. The method of claim 10, The encryption analysis unit, A UDP packet receiver for receiving an encrypted data stream generated by a stream server as a UDP (User Datagram Protocol) packet; A TS packet extracting unit extracting a TS packet from the received UDP packet; A TS packet parser for analyzing the extracted TS packets into I frames, B frames, and P frames; Encryption determination unit for determining whether to encrypt the I frame of the TS packet, A TS packet encryption analyzer for decrypting only the I frame of the encrypted TS packet; A second buffer for storing the TS packets decoded only in the I frame User terminal comprising a. The method of claim 11, And if the I frame of the TS packet is encrypted, the encryption determining unit transmits the TS packet to the TS packet encryption analyzing unit, and transmits the I frame of the TS packet to the second buffer if the I frame of the TS packet is not encrypted.

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