KR20100034508A - Apparatus and method for recording digital broadcasting contents - Google Patents

Abstract

PURPOSE: A digital broadcast program recording method, a device thereof, and a system thereof are provided to control broadcast program recording through program protection signals in broadcast programs and to protect broadcast program contents by encrypting the broadcast programs which include protection information. CONSTITUTION: A broadcast program recording system extracts a program protection signal from an inputted broadcast program(304). The broadcast program recording system checks protection information of the broadcast program from the program protection signal(306). When recording the broadcast program, the broadcast program recording system decides encryption depending on the protection information(308). If encryption information in the protection information is valid, the broadcast program recording system encrypts the broadcast program.

Description

Method, apparatus and system for recording digital broadcast programs {APPARATUS AND METHOD FOR RECORDING DIGITAL BROADCASTING CONTENTS}

The present invention relates to a technique for recording a digital broadcast program, and more particularly, to a technique for controlling recording of a broadcast program using a program protection signal embedded in the broadcast program.

The present invention is derived from the research conducted as part of the IT growth engine technology development project of the Ministry of Knowledge Economy and the Ministry of Information and Telecommunication Research and Development. [Task management number: 2007-S-003-02, Title: Development of protection technology for terrestrial DTV broadcasting program] ].

Digital broadcasting is rapidly spreading due to the advantage of providing a high-quality, multi-channel environment to viewers. Digital broadcasting is very convenient to store, edit, and distribute broadcast programs, but at the same time, unauthorized copying and distribution of broadcast programs is also easy. Nowadays, many domestic broadcast programs are illegally stored and distributed through the Internet and peer-to-peer. In particular, broadcast programs are illegally distributed or sold as a DVD (Digital Versatile Disk).

In general, TV broadcasts are known as free-to-air (FTA) TVs because they are distributed freely to anyone who can receive the signal. In most countries, digital TV (DTV) broadcasts are often operated free of charge, and DTV broadcasts are produced and broadcast without protection, unlike other digital content that is encrypted and distributed despite being a form of professional digital content distribution. In Korea, digital contents such as digital satellite broadcasting, satellite digital multimedia broadcasting (DMB), and IP-TV are protected through technologies such as CAS (Conditional Access System) and DRM (Digital Rights Management). However, terrestrial DTV broadcast content is transmitted in an unencrypted form that anyone can see. DTV broadcast content is a complex content that contains a large amount of copyright, which can be easily copied while maintaining the original quality, and can be distributed in large quantities worldwide in an instant through a computer connected to the Internet. Unauthorized distribution of DTV broadcast content may cause irreparable loss to the copyright holder who provided the broadcast content. In addition, if the DTV broadcaster does not secure the technology to protect the DTV broadcasting content, DTV broadcasting may not gain the trust of the content providers, and thus the competitiveness of the DTV broadcasting may be weakened. Therefore, a technology for protecting DTV content by preventing unauthorized redistribution of DTV content is essential.

Not only DTV broadcasting but also other types of digital broadcasting, the importance of program protection technology is increasing. Broadcast program protection technology protects the rights of copyright holders by preventing unauthorized redistribution and retransmission of broadcast programs, and guarantees fair use of viewers to broadcast programs to provide viewers with high-quality programs and various digital broadcasting services. to provide. In accordance with this trend, technologies for controlling the recording, storage, and redistribution of broadcast programs through user terminals have been introduced by expressing copyright information through PSIP (Program and System Information Protocol) information of broadcast programs.

Therefore, an object of the present invention is to prevent unauthorized redistribution of broadcast programs containing protection information.

Another object of the present invention is to protect the contents of a broadcast program by encrypting the broadcast program including the protection information.

The objects of the present invention are not limited to the above-mentioned objects, and other objects and advantages of the present invention which are not mentioned above can be understood by the following description, and will be more clearly understood by the embodiments of the present invention. It will also be readily apparent that the objects and advantages of the invention may be realized and attained by means of the instrumentalities and combinations particularly pointed out in the appended claims.

In order to achieve the above object, the present invention provides a method of recording a digital broadcast program, the method comprising: receiving a broadcast program into which a program protection signal is inserted; extracting a program protection signal from the broadcast program; Confirming protection information of the broadcast program from the program protection signal, determining whether to encrypt the recording of the broadcast program according to the protection information, and recording the broadcast program according to whether the encryption is performed. Characterized in that it comprises a step to.

In addition, the present invention provides a device for recording a digital broadcast program, a program protection signal extraction unit for extracting a program protection signal from the broadcast program, and program protection signal analysis for confirming the protection information for the broadcast program from the program protection signal And an encryption control unit for determining whether to encrypt the recording of the broadcast program according to the protection information.

In addition, the present invention provides a system for recording a digital broadcast program, comprising: an input unit for receiving a broadcast program having a program protection signal inserted therein, a program protection signal extraction unit for extracting a program protection signal from the broadcast program, and the program protection signal A program protection signal analysis unit for confirming protection information for the broadcast program, an encryption control unit for determining whether to encrypt the recording of the broadcast program according to the protection information, and recording the broadcast program according to the encryption status. It is still another feature to include a broadcast program recording unit.

According to the present invention as described above it is possible to prevent unauthorized redistribution of the broadcast program containing the protection information. In particular, the content of the broadcast program can be protected by encrypting the broadcast program including the protection information.

The above objects, features, and advantages will be described in detail with reference to the accompanying drawings, whereby those skilled in the art to which the present invention pertains may easily implement the technical idea of the present invention. In describing the present invention, when it is determined that the detailed description of the known technology related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description will be omitted. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a broadcast program recording system 100 according to an embodiment of the present invention. As shown in FIG. 1, the broadcast program recording system 100 includes an input unit 120, a program protection signal extraction unit 122, a program protection signal analysis unit 124, an encryption control unit 126, and a broadcast program recording unit 128. ). The program protection signal extractor 122, the program protection signal analyzer 124, and the encryption controller 126 may configure the broadcast program recording apparatus 110.

The input unit 120 receives a broadcast program into which a program protection information (PPI) is inserted. Although not shown in FIG. 1, the input unit 120 may receive a broadcast program from a broadcast station or may receive a broadcast program from a device inside or outside the broadcast program recording system 100. The program protection signal inserted into the broadcast program may include protection information about the broadcast program and a broadcast program identifier which is unique information of the broadcast program. The program identifier may be included in the broadcast program. The input unit 120 transmits the input broadcast program to the program protection signal extracting unit 122.

The program protection signal extractor 122 extracts the program protection signal from the broadcast program and transfers the program protection signal to the program protection signal analyzer 124. The program protection signal analyzer 124 confirms protection information on the broadcast program from the extracted program protection signal. The protection information represents copyright information about a broadcast program, redistribution authority information, and the like. The program protection signal analysis unit 124 checks the presence or absence of protection information in the program protection signal, and confirms whether or not the protection information is valid. The program protection signal analysis unit 124 transmits the protection information check result to the encryption control unit 126.

The encryption control unit 126 determines whether to encrypt a video when recording a broadcast program according to the received protection information. The encryption control unit 126 may determine to encrypt the broadcast program if the protection information is valid, and may not determine to encrypt the broadcast program if the protection information is invalid or does not exist. As another embodiment, the encryption control unit 126 may determine to encrypt the broadcast program if the encryption information in the protection information is valid, and determine not to encrypt the broadcast program if the protection information does not exist or the encryption information in the protection information is invalid. have. The encryption controller 126 may operate in conjunction with the broadcast program recording unit 128. The broadcast program recording unit 128 records a broadcast program according to whether encryption is determined by the encryption control unit 126. Therefore, the broadcast program including the effective protection information is encrypted and recorded by the broadcast program recording unit 128. At this time, the broadcast program recording unit 128 may extract a broadcast program identifier from the broadcast program, and use it as an encryption key or to generate an encryption key. According to an exemplary embodiment, the broadcast program recording unit 128 may package at least one of a program protection signal, protection information, a program identifier, and information on whether or not to encrypt the recorded broadcast program.

As such, the broadcast program recording system 100 may encrypt and record a broadcast program to be protected by checking the protection information of the broadcast program. Therefore, only a person who has the authority to decrypt the encrypted broadcast program can view the recorded broadcast and can prevent the broadcast program from being redistributed without permission.

2 is a block diagram of a broadcast program recording system 200 according to another embodiment of the present invention. In the embodiment shown in FIG. 2, the broadcast program recording system 200 receives a DTV broadcast program from the broadcast station 250. The broadcast program recording system 200 includes a DTV tuner 210, a demux 212, a decoder (A / V decoder) 214, a program protection signal analyzer (PPI analyzer) 218. ), An encryption control unit 220, and a storage unit 222.

The broadcasting station 250 is multiplexed by the multiplexer (MUX) 254 to transmit the DTV broadcast program 252 in which the program protection signal is inserted. There is a table containing additional information in the PSIP (Program and System Information Protocol) of the ATSC digital broadcasting method standardized by the Advanced Television System Committee (ATSC). PSIP is a standardized table in ATSC for describing structure information, that is, system and program organization information, on a Transport Stream (TS) transmitted through MPEG-2 multiplexing and digital broadcasting. Of people. The RC (Dedistribution control) Descriptor is one of tables that contain additional information in the PSIP, and is a table for transmitting information for preventing redistribution of broadcast programs. The structure of the RC Descriptor may be configured as shown in Table 1.

Syntax Number of Bits Format rc_descriptor () {    descriptor_tag 8 0xAA    descriptor_length 8 uimsbf    for (i = 0; i <descriptor_length; i ++) {       rc_information () 8 uimsbf    } }

By using rc_information () of the RC Descriptor, copyright information and redistribution authority information of a broadcast program can be stored. The program protection signal may be included in the broadcast program and transmitted as rc_information (). The program protection signal may be configured as shown in Table 2.

Syntax Number of Bits Format program_protection_information () {    version 8 0xAA    Redistribution_control_code 2 uimsbf    if (Redistribution_control_code == '01') {       allowed_max_resolution 2 uimsbf       holdback_time 3 uimsbf       allowed_length 3 uimsbf    }    Redistribution_area One uimsbf    reserved 5 bslbf    ppi_signature 320 uimsbf }

The program protection signal shown in Table 2 is an embodiment configured to be included in the RC Descriptor for transmission, and the program protection signal may be in accordance with the TTA (Telecommunications Technology Association) terrestrial broadcasting program protection signal transmission / reception standard.

The broadcast program identifier connected to the program protection signal may be transmitted by a Content Labeling Descriptor (or Content ID Descriptor) in the PSIP. The broadcast program identifier includes broadcast program specific information. The Content ID Descriptor may be configured as shown in Table 3, and the Content Labeling Descriptor may be configured as shown in Table 4.

Syntax Number of Bits Format content_ID-descriptor () {    ID_sytstem 8 0xBB    ID_length 8 uimsbf    content_identifier var }

Syntax Number of Bits Format content_labeling_descriptor () {    descriptor_tag 8 0x36    descriptor_length 8 uimsbf    metadata_application_format 16 uimsbf    if (metadata_application_format == 0xFFFF) { metadata_application_format_identifier 32 uimsbf } content_reference_id_record_flag One bslbf    content_time_base_indicator 4 uimsbf    reserved 3 bslbf    if (content_reference_id_record_flag == '1') {       content_reference_id_record_length 8 uimsbf       for (i = 0; i <content_reference_id_record_length; i ++) { content_reference_id_byte 8 bslbf } } if (content_time_base_indicator == 1 | 2) { reserved 7 bslbf content_time_base_value 33 uimsbf reserved 7 bslbf metadata_time_base_value 33 uimsbf    }    if (content_time_base_indicator == 2) { reserved One bslbf       Content_id 7 uimsbf    }    if (content_time_base_indicator == 3 | 4 | 5 | 6 | 7) {       time_base_association_data_length 8 uimsbf       for (i = 0; i <time_base_association_data_length; i ++) {          reserved 8 bslbf       }    }    for (i = 0; i <N; i ++) {       private_data_byte 8 bslbf    } }

All terminals receiving the broadcast program 252 having the program protection signal inserted therein may be obliged to recognize the program protection signal and output the broadcast program in a protected form.

The DTV Tuner 210 of the broadcast program recording system 200 receives the broadcast program 252 from the broadcast station 250 and transmits the broadcast program 252 to the Demux 212. Demux 212 demultiplexes the broadcast program 252 multiplexed and transmitted. At this time, the PPI extractor included in the Demux 212 extracts a program protection signal included in the broadcast program 252. In FIG. 2, the PPI extractor is illustrated as an internal module included in the Demux 212, but may be configured as one independent module in the broadcast program recording system 200. The PPI analyzer 218 receives a program protection signal from the PPI extractor to confirm protection information and a program identifier for the broadcast program, and transmits it to the encryption controller 220.

The encryption controller 220 encrypts and records a part or all of the broadcast program 252 when the protection information is valid, and records the broadcast program 252 without encryption when the protection information is invalid or does not exist. In this case, as another embodiment, the encryption controller 220 may determine whether the encryption information included in the protection information is valid or not, instead of determining whether the protection information is invalid. The encryption information in the protection information may be determined according to the value of "redistribution_control_code" shown in Table 2. If the value of "redistribution_control_code" is not interpreted as unlimited (for example, redistribution_control_code == '11'), the encryption information is determined to be valid.

As the encryption algorithm, AES, DES, TDES, SEED, etc. may be used. The encryption controller 220 may use the extracted program identifier as an encryption key or generate an encryption key as shown in Tables 2 to 4 during the encryption process. The broadcast program recorded by the encryption controller 220 is stored in the storage 222. The encryption controller 220 may receive the broadcast program decrypted by the A / V Decoder 214 in the process of recording the broadcast program. The user can watch the broadcast program through the internal output regardless of whether the program is recorded or recorded through encryption.

When recording ends, the broadcast program recording system 200 may finally output the stored broadcast program to the outside. The broadcast program recording system 200 outputs the broadcast program 230 recorded without encryption, or outputs the encrypted broadcast program 240. The broadcast program recording system 200 may package and output the broadcast programs 230 and 240 to be output as a file. File packaging may be selectively performed by the broadcast program recording system 200 during recording or final output. The broadcast program recording system 200 may pre-generate a part of the packaging information at the start of recording and store the package at the end of recording. On the other hand, when the broadcast program recording system 200 stores the file in TS format, the packaging process may be omitted.

3 is a flowchart illustrating a broadcast program recording method according to an embodiment of the present invention. A broadcast program recording method will be described with reference to FIG. 1.

First, the broadcast program recording system 100 receives a broadcast program in which a program protection signal is inserted 302. The broadcast program recording system 100 extracts a program protection signal 304 from an input broadcast program and verifies 306 protection information for the broadcast program from the program protection signal. The broadcast program recording system 100 determines 308 whether to encrypt the broadcast program according to the identified protection information. The broadcast program recording system 100 may determine to encrypt a broadcast program when the encryption information in the protection information is valid, and determine not to encrypt the broadcast program when the protection information does not exist or the encryption information in the protection information is invalid. have. The broadcast program recording system 100 records 310 a broadcast program according to the determined encryption.

While the broadcast program recording system 100 records a broadcast program, a plurality of broadcast programs having different protection information may be sequentially received, or a broadcast program having only protection information for a part of a broadcast program may be received. In this case, since the protection information is changed while the broadcast program recording system 100 records the broadcast program, the encryption or not may be changed. When the broadcast program recording system 100 stores the encrypted broadcast program and the unencrypted broadcast program in the same stream, a problem may occur in that the decoder cannot properly decrypt the broadcast program when playing the stored stream.

In order to prevent such a problem from occurring, the broadcast program recording system 100 may change and insert a field value indicating whether to encrypt or not to a packet in which a broadcast program is recorded. According to an embodiment, the broadcast program may be stored in the form of TS. The TS is a bit string in which a plurality of encoded video bit strings (multiple broadcast programs) are multiplexed, which is suitable for DTV broadcasting, and is composed of TS packets. The TS packet may be configured as shown in Table 5, and a transport_scrambling_control may be inserted as a field indicating whether to encrypt the TS packet.

Syntax Number of Bits Format transport_packet () {    sync_byte 8 0x47    transport_error_indicator One bslbf    payload_unit_start_indicator One bslbf    transport_priority One bslbf    PID 13 uimsbf transport _ scrambling _ control 2 bslbf    adaptation_field_control 2 bslbf    continuity_counter 4 uimsbf    if (adaptation_field_control == '10'       || adaptation_field_control == '11') {       adaptation_field ()    }    if (adaptation_field_control == '10'       || adaptation_field_control == '11') {       for (i = 0; i <N; i ++) {          data_byte 8 bslbf       }    } }

In case of a TS packet of a broadcast program transmitted through the terrestrial wave, a value of a transport_scrambling_control field is set to '00'. The broadcast program recording system 100 sets a value of the transport_scrambling_control field to '00' in case of a TS packet constituting an unencrypted broadcast program. The broadcast program recording system 100 sets the transport_scrambling_control field value of the TS packet constituting the encrypted and recorded broadcast program to a value other than '00' (for example, '01', '10', '11'). Can be. Which value is set to '01', '10', or '11' may be determined according to the selection of an encryption key or a recording system. In this way, the broadcast program recording system 100 sets a field value indicating whether or not to encrypt the header of each packet, thereby preventing an error in the decoder stage that may occur when the encryption status is changed when playing the recorded TS.

4 is a flowchart illustrating a broadcast program recording method according to another embodiment of the present invention. A broadcast program recording method will be described with reference to FIG. 1.

First, the broadcast program recording system 100 receives a broadcast program in which a program protection signal is inserted 402. The broadcast program recording system 100 may extract a program protection signal from the input broadcast program 404 and store the extracted program protection signal. The broadcast program recording system 100 extracts a program identifier 405 from a broadcast program to use as an encryption key in recording a broadcast program or to generate an encryption key. The extracting of the program identifier 405 may be performed at the same time as the extracting the program protection signal 404 or in the reverse order (the order of extracting the program identifier first and then extracting the program protection signal). The broadcast program recording system 100 checks the protection information on the broadcast program from the program protection signal (410), and determines whether or not to encrypt the broadcast program when recording the broadcast program according to the protection information (412). The broadcast program recording system 100 records 416 a broadcast program according to the determined encryption.

The broadcast program recording system 100 may further receive a broadcast program 406. In addition, the input broadcast program is provided to the program protection signal extractor 122 (408). The program protection signal extraction unit 122 further extracts a program protection signal from the inputted broadcast program (404), and extracts a program identifier (405). If the stored program protection signal is different from the extracted program protection signal, the program protection information may be updated and stored. If the stored program identifier is different from the extracted program identifier, the program identifier may be updated and stored. The broadcast program recording system 100 may use the extracted program identifier as an encryption key when recording a broadcast program or to generate an encryption key. The broadcast program recording system 100 checks the protection information from the updated program protection signal (410). The broadcast program recording system 100 may recognize that the protection information of the broadcast program has been changed by comparing the previously stored program protection signal or program identifier with the updated program protection signal or program identifier. The broadcast program recording system 100 determines whether the updated broadcast program is encrypted (412) and records (416) the additionally input broadcast program according to the determined encryption or not.

The broadcast program recording system 100 may package the broadcast program into a file 418 when the recording of the first input broadcast program and the additional input broadcast program is ended. In the packaging process, a broadcast program may be combined with at least one of a program protection signal, protection information, a program identifier, and information on whether encryption is performed. The first input broadcast program and the additionally input broadcast program may be packaged in different files or may be packaged together in the same file. A more detailed description of the packaging process is provided below in conjunction with FIGS. 5A and 5B.

5A is a flowchart illustrating a method of packaging a broadcast program according to another embodiment of the present invention. The broadcast station 510 transmits a broadcast program 512 not including protection information and a broadcast program 514 including valid protection information. The broadcasting station 510 inserts and transmits a program protection signal including protection information in the broadcast program 514. The broadcast program recording system 500 receives and records the broadcast program 512 as described above, and further receives and records the broadcast program 514. The broadcast program 512 is recorded without encryption because it does not contain protection information, and the broadcast program 514 is encrypted because it contains valid protection information.

The broadcast program recording system 500 packages the recorded broadcast programs 512 and 514 into two files 516 and 518, respectively. File 516 includes broadcast program 512 recorded unencrypted, and file 518 includes broadcast program 514 recorded encrypted. As such, the broadcast program recording system 500 divides and stores the broadcast program into separate files depending on whether the encryption is encrypted, thereby preventing a codec problem that may occur while recording the broadcast program having a different encryption. Meanwhile, when the two broadcast programs 512 and 514 have different protection information or different encryption information, or have different program identifiers, the two broadcast programs 512 and 514 may be stored as files to which two encryptions are applied.

5B is a flowchart illustrating a method of packaging a broadcast program according to another embodiment of the present invention. The broadcast station 520 transmits a broadcast program 522 including no protection information and a broadcast program 524 including valid protection information. The broadcast program recording system 550 receives, records, and records the two broadcast programs 522 and 524 as described above. The broadcast program 522 is recorded without being encrypted because it does not contain protection information, and the broadcast program 524 is encrypted after being recorded because it contains valid protection information.

The broadcast program recording system 550 divides the recorded broadcast programs 532 and 534 into two tracks 528 and 530, respectively, and packages them in a file 526. The recorded broadcast programs 532 and 534 are data of recording the broadcast programs 522 and 524, respectively, and the recorded broadcast program 534 is encrypted. In this way, the broadcast program recording system 550 divides the broadcast program into separate tracks according to encryption or not and stores it in one file with track information, thereby preventing a codec problem that may occur while recording another broadcast program with or without encryption. Meanwhile, when two broadcast programs 522 and 524 have different protection information or different encryption information or have different program identifiers, the two broadcast programs 522 and 524 may be stored as tracks to which two encryptions are applied.

 6 is a flowchart illustrating a broadcast program recording method according to another embodiment of the present invention. A broadcast program recording method will be described with reference to FIG. 1.

The broadcast program recording system 100 receives a broadcast program (602) and extracts a program protection signal (604). The broadcast program may be continuously received in packet units. The broadcast program recording system 100 stores 606 the extracted program protection signal and then starts recording 608 of the broadcast program.

The broadcast program recording system 100 checks the protection information for the broadcast program from the stored program protection signal (610). The broadcast program recording system 100 encrypts the TS 614 and records 616 the broadcast program when the protection information exists and the encryption information in the protection information is valid according to the protection information presence or absence 612. Meanwhile, the broadcast program recording system 100 records 618 without encrypting a broadcast program when there is no protection information or when encryption information in the protection information is invalid. Since the broadcast program is continuously received in packet units, the broadcast program recording system 100 checks the protection information and the program identifier again when the broadcast program remains (610). If the protection information is different from the existing protection information or the program identifier is different from the existing program identifier, the broadcasting program may be recorded by changing the encryption or not.

When the recording is finished 620, the broadcast program recording system 100 packages 622 and outputs the broadcast program. When the broadcast program is changed while the broadcast program recording system 100 is recording a broadcast program or the protection information is changed due to a change in the program protection signal, the broadcast program recording system 100 is described with reference to FIG. 5A or 5B. The broadcast program may be packaged 622 to prevent an error. In addition, when storing the recorded broadcast program in TS format, the broadcast program recording system 100 may omit the packaging step 622 and change and insert a field value indicating whether to encrypt the TS packet.

In addition, when the program identifier is different even though the program protection information is matched, the broadcast program recording system 100 may package the broadcast program by separating it into two different files or two tracks similarly to FIGS. 5A and 5B. This creates a file with two encryptions or a track with two encryptions. In this case, different encryption may be applied by distinguishing a key used for encrypting two files or two tracks.

The term module described herein refers to a unit representing an apparatus for processing a specific function or operation, which may be implemented in hardware or software or a combination of hardware and software.

The apparatus and system described above may be implemented in hardware, software, or a combination thereof. In a hardware implementation, the modules used for recording broadcast programs may include one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing units (DSPDs), programmable logic units (PLDs), field programmable A gate array (FPGA), a processor, a controller, a micro-controller, a microprocessor, another electronic unit designed to perform the functions described herein, or a combination thereof. The software may be implemented through a module that performs the functions described herein. Software code may be stored in memory units and executed by a processor. The memory unit may be implemented inside or outside the processor, in which case the memory may be coupled to the processor via various known means.

On the other hand, the method of the present invention as described above can be written in a computer program. And the code and code segments constituting the program can be easily inferred by a computer programmer in the art. In addition, the written program is stored in a computer-readable recording medium (information storage medium), and read and executed by a computer to implement the method of the present invention. And the recording medium includes all types of recording media (intangible medium such as a carrier wave as well as tangible media such as CD and DVD) readable by a computer.

The present invention described above is capable of various substitutions, modifications, and changes without departing from the technical spirit of the present invention for those skilled in the art to which the present invention pertains. It is not limited by the drawings.

1 is a block diagram of a broadcast program recording system 100 according to an embodiment of the present invention.

2 is a block diagram of a broadcast program recording system 200 according to another embodiment of the present invention.

3 is a flowchart illustrating a broadcast program recording method according to an embodiment of the present invention.

4 is a flowchart illustrating a broadcast program recording method according to another embodiment of the present invention.

5A is a flowchart illustrating a method of packaging a broadcast program according to another embodiment of the present invention.

5B is a flowchart illustrating a method of packaging a broadcast program according to another embodiment of the present invention.

 6 is a flowchart illustrating a broadcast program recording method according to another embodiment of the present invention.

Claims (12)

In the method of recording a digital broadcast program, Receiving a broadcast program into which a program protection signal is inserted; Extracting a program protection signal from the broadcast program; Confirming protection information on the broadcast program from the program protection signal; Determining whether to encrypt the recording of the broadcast program according to the protection information; Recording the broadcast program according to whether the encryption is performed. Broadcast program recording method comprising. The method of claim 1, And determining whether to encrypt the broadcast program when the protection information is valid, and not to encrypt the broadcast program when the protection information is invalid or does not exist. The method of claim 1, The step of determining whether to encrypt is to determine that the broadcast program is encrypted when the encryption information in the protection information is valid, and not to encrypt the broadcast program when the protection information does not exist or the encryption information in the protection information is invalid. Broadcast program recording method to determine. The method of claim 1, The broadcast program recording step And a field value indicating whether the broadcast program is encrypted or inserted into a TS packet in which the broadcast program is recorded. The method of claim 1, Receiving an additional broadcast program; Providing the additionally inputted broadcast program as the program protection signal extraction step; Broadcast program recording method further comprising. The method of claim 1, Extracting a program identifier from the broadcast program; And recording the broadcast program using the program identifier as an encryption key or to generate an encryption key. The method of claim 1, And combining and packaging at least one of the program protection signal, the protection information, and information on whether the encryption is performed with the recorded broadcast program. 8. The method according to any one of claims 1 to 7, The determining whether to encrypt the broadcast program recording method using the redistribution_control_code value in the ATSC RC Descriptor to determine whether to encrypt. The method of claim 7, wherein The packaging step And storing the broadcast program into separate files according to the protection information or program identifier. The method of claim 7, wherein The packaging step And storing the broadcast program into separate tracks according to the protection information or program identifier. An apparatus for recording a digital broadcast program, A program protection signal extraction unit for extracting a program protection signal from the broadcast program; A program protection signal analysis unit for confirming protection information on the broadcast program from the program protection signal; An encryption control unit for determining whether to encrypt the recording of the broadcast program according to the protection information; Broadcast program recording device comprising. In the system for recording a digital broadcast program, An input unit for receiving a broadcast program into which a program protection signal is inserted; A program protection signal extraction unit for extracting a program protection signal from the broadcast program; A program protection signal analysis unit for confirming protection information on the broadcast program from the program protection signal; An encryption control unit for determining whether to encrypt the recording of the broadcast program according to the protection information; The broadcast program recording unit for recording the broadcast program according to the encryption or not Broadcast program recording system comprising.

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