KR100728242B1 - System for protecting MPEG-2 TS files, apparatus and method of generating/playing protection MPEG-2 TS in its - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates to a system for protecting a video file of a streaming service, a device for generating / playing a protected video, and a method thereof.

2. The technical problem to be solved by the invention

In order to protect the video from illegal storage of the video, the server serving the video encrypts a portion of the video file (payload of MPEG-2 TS packet) by applying an encryption / decryption technique to serve the video. In order to provide a protection system of a streaming service video file, a device for generating / playing a protected video thereof, and a method thereof, capable of decrypting a protected video (playing a protected video) at the time of playing a video, the client side watching the video is provided. .

3. Summary of Solution to Invention

According to an aspect of the present invention, there is provided a system for protecting a streaming video file, comprising: protected video generating means for generating a protected video TS packet by encrypting a payload of an original video transport stream (TS) packet; A license server for storing and managing encryption information of the media data transferred from the protected video generating means, and issuing a license to a corresponding user when a license issuing request from a legitimate user; An Internet server which shows content information to a user and requests the license server to issue a license for the video content requested by the user; A streaming server for transmitting the protected video TS packet generated by the protected video generating means through streaming; And protected video reproducing means for decoding the payload of the protected video TS packet transmitted from the streaming server using the issued decryption information of the license to reproduce the decrypted video TS packet.

4. Important uses of the invention

The present invention is used for streaming services.

Streaming, MPEG-2 TS, Video Files, Piracy, Payload

Description

System for protecting MPEG-2 TS files, apparatus and method of generating / playing protection MPEG-2 TS in its}             

1 is a configuration diagram of an embodiment of a video file protection system according to the present invention;

2 is a structural diagram of an MPEG-2 TS used in the present invention;

3 is a detailed structural diagram of the MPEG-2 TS packet header of FIG. 2 used in the present invention;

4 is a detailed configuration diagram of an embodiment of the protection video generating device of FIG. 1 according to the present invention;

5 is a flowchart illustrating an embodiment of a method for generating a protected video according to the present invention;

6 is a detailed flowchart illustrating an embodiment of an MPEG-2 TS payload encryption process of FIG. 5 according to the present invention;

7 is a structure diagram of a protected MPEG-2 TS packet according to the present invention;

8 is a detailed configuration diagram of an embodiment of the protection video reproducing apparatus of FIG. 2 according to the present invention;

9 is a flowchart illustrating an embodiment of a method for playing a guarded video according to the present invention.

* Explanation of symbols for the main parts of the drawings

10: protection video generation device 20: license server

30: web server 40: streaming server

50: protected video playback device

The present invention relates to a system for protecting a video file that is provided by a streaming service, a device for generating / playing a protected video, and a method thereof, and more particularly, in the form of a MPEG-2 TS (Motion Picture Experts Group 2 Transport Stream), which is a streaming video file format. The present invention relates to a system for protecting a video file and a protected video generating / reproducing apparatus and a method thereof, for preventing illegal use and distribution of contents through illegal storage of a video in an environment in which a video is served by a video on demand method. .

MPEG-2 is a video compression technology standardized to ISO 13818 in 1994. This is an improvement on MPEG-1 for motion pictures that require high image quality and sound quality such as digital TV and DVD.

MPEG-2 TS is a method of multiplexing the MPEG-2 system to be suitable for streaming. This is a method of loading MPEG-2 data in a relatively small packet of 188 bytes in consideration of errors on the network.

As digital information is easy to produce and distribute, digitalized video production is increasing. However, since digital contents are easily distributed, distributed, and distributed through the unsecure Internet, security and copyright issues are emerging as important issues. This problem has occurred mainly in the video stored and played on the user's PC, and in the related art, in order to protect the video file stored in the user's PC, after encrypting the entire video file, only the legitimate user can decrypt the encrypted video file. A method of providing information is used.

On the other hand, streaming is a technology that enables playback by transmitting data in real time without storing contents in a local system. In the case of large-capacity video content, it takes a lot of time to download, so it is common to provide services through streaming in the same manner as video on demand. In general, compared to a video stored and played on a user's PC, a video played through a streaming service is not stored in the user's PC, thereby solving the problem of illegal copying. However, with the recent emergence of programs that can store videos serviced through streaming, there is also a need for protection of videos served through streaming. However, conventionally, access control-oriented security measures are used to protect streaming video.

The existing streaming server determines the media data to be sent in real time using the information of the video file when transmitting the video through streaming. At this time, the streaming video file is configured and stored in the form of a network packet in advance, or stores information for making a network packet in real time.

A common content protection scheme uses a method of encrypting an entire file. However, if a method of encrypting the entire file is used in order to protect the video serviced through streaming, streaming is impossible because the information that can configure the network packet is modified.

Therefore, there is an urgent need for a method for protecting a video in the form of an MPEG-2 TS file that is streaming service while preventing a problem of streaming a video from an existing streaming server.

The present invention has been proposed in order to solve the above problems, in order to protect the video from illegal storage of the video, the server serving the video by applying encryption and decryption technology part of the video file (paid load of MPEG-2 TS packet) Protection system for video files that are serviced by streaming (protected video generation), and on the client side viewing a video, which can decrypt (protected video playback) a protected video during video playback, and a protected video generation / playback device thereof. And a method thereof.

Other objects and advantages of the present invention can be understood by the following description, and will be more clearly understood by the embodiments of the present invention. Also, it will be readily appreciated that the objects and advantages of the present invention may be realized by the means and combinations thereof indicated in the claims.

In order to achieve the above object, the present invention provides a protection system for a streaming video file, comprising: protected video generating means for generating a protected video TS packet by encrypting a payload of an original video transmission stream (TS) packet; A license server for storing and managing encryption information of the media data transferred from the protected video generating means, and issuing a license to a corresponding user when a license issuing request from a legitimate user; An Internet server which shows content information to a user and requests the license server to issue a license for the video content requested by the user; A streaming server for transmitting the protected video TS packet generated by the protected video generating means through streaming; And a protected video reproducing means for reproducing the decoded video TS packet by decoding the payload of the protected video TS packet transmitted from the streaming server by using the decrypted information of the issued license.

In addition, according to the present invention, in the apparatus for generating a video file of a streaming service, whether a video sequence header, a frame header, or an audio frame header is included in an original video transport stream (MPEG-2 TS) packet payload, TS packet analyzing means for finding a position to encrypt; Encrypt the payload of the video transport stream (MPEG-2 TS) packet and set the value of the scrambling control bit of the video transport stream (MPEG-2 TS) packet to 'having an encrypted payload ("11"). Video transmission stream payload encryption means for; And protected video generating means for generating a protected video transport stream (MPEG-2 TS) file using the encrypted video transport stream (MPEG-2 TS) packet.

In addition, the present invention provides a device for reproducing a protected MPEG-2 TS packet generated by the protected video generating apparatus, comprising: streaming data receiving means for receiving a video transport stream (MPEG-2 TS) packet transmitted from a streaming server; Decoding means for reading the decoding related information stored in the license storage and decoding the payload of the video transmission stream (MPEG-2 TS) packet received from the streaming data receiving means; And playback means for decoding the decoded video transport stream (MPE-2 TS) packet to play the video on the screen.

On the other hand, the present invention is a method of generating a video file serviced by streaming service, selecting a video transmission stream (MPEG-2 TS) file, the video file selection and encryption option setting step of setting encryption-related options to encrypt the selected file ; An analysis step of reading and analyzing one video transport stream (MPEG-2 TS) packet from the selected file; A packet encryption step of encrypting the payload of the selected video transport stream (MPEG-2 TS) packet according to the encryption size in the TS packet of the encryption option according to the set encryption option and the analysis result; And generating a protected video transport stream file by combining the encrypted video transport stream (MPEG-2 TS) packets to generate a protected video transport stream (MPEG-2 TS) file.

In addition, the present invention is characterized in that it further comprises an encryption information transmission step of transmitting the encryption-related information generated in the encryption option setting step and the packet encryption step to the license server.

The present invention provides a method of playing a protected video transport stream (MPEG-2 TS) packet generated by the protected video generation method, comprising: obtaining a license and extracting decryption information from the license; Requesting streaming to the streaming server; Receiving a video transport stream (MPEG-2 TS) packet from the streaming server; Extracting a scrambling control bit value from the received video transport stream (MPEG-2 TS) packet and examining the extracted scrambling control bit value; And if the scrambling control bit value is set to 'having an encrypted payload (" 11 "), after decoding the payload of the MPEG-2 TS packet by using the decoding information. And decoding and playing the decoded video transport stream (MPEG-2 TS) packet.

The present invention encrypts only the payload of MPEG-2 TS packets without modifying the MPEG-2 TS file format for contents protection.

In general, when the entire media data is encrypted to protect the video file, performance may be degraded due to a decryption process when playing the video on the client side. In order to solve this problem, according to the present invention, by selectively encrypting a part of the media data and inserting information indicating whether the media data is encrypted, the media data to be decoded in the video reproducing apparatus can be selected. Make sure

This encryption process can protect the video while still using the existing streaming service environment, and has the advantage of not significantly affecting the performance of the entire system.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, whereby those skilled in the art may easily implement the technical idea of the present invention. There will be. In addition, 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 thereof will be omitted. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a configuration diagram of a video file protection system according to an embodiment of the present invention, and shows an overall system configuration for streaming service while protecting an MPEG-2 TS file.

As shown in FIG. 1, a video file protection system for safely streaming an MPEG-2 TS file according to the present invention generates a protected video TS packet by encrypting a payload of an original video transport stream (TS) packet. And a license server 20 for storing and managing encryption information of the media data transferred from the protected video generating device 10, and for issuing a license to the corresponding user when a license issuance request is issued from a legitimate user. And the protected video TS generated by the protected video generating apparatus 10 and the web server 30 showing the content information to the user and requesting the license server 20 to issue a license for the video content requested by the user. Streaming server 40 for transmitting the packet through streaming, and decryption information of the license issued And it decodes the payload of the protected video TS packets transmitted from the streaming server 40, includes a protected video reproduction device 50 for reproducing the decoded video TS packets.

Here, the license is a document in the form of XML (eXtensible Markup Language) that contains information necessary for the user to play the protected video. This information includes the decryption key and encryption options required to decrypt the protected video, and an electronic signature using the issuer's certificate is added to prevent forgery in the transmission process.

The protected video generating device 10 converts an original MPEG-2 TS file into a protected MPEG-2 TS file. In addition, the protected video generating device 10 transmits the encryption key information and the encryption option information used for encryption to the license server 20, and transmits the encrypted MPEG-2 TS file to the streaming server 40.

The license server 20 stores and manages encryption key information and encryption option information received from the protected video generating device 10, and receives a license issuance request from the web server 30 to issue a license to the protected video playing device 50. Function

The web server 30 shows the information of the content to the buyer, and has a function of requesting the license server 20 to issue a license for the video content requested by the user.

The streaming server 40 transmits the protected MPEG-2 TS file generated by the protected video generating device 10 to the protected video playing device 50 through streaming.

The protected video reproducing apparatus 50 functions to decode and play MPEG-2 TS video data transmitted from the streaming server 40 using license information issued from the license server 20.

For reference, the structure of the MPEG-2 TS will be described with reference to FIG. 2.

The MPEG-2 encoder encodes moving image data to generate video or audio elementary stream (PSI) or program specific information (PSI) data.

The MPEG-2 system is a standard for collectively transmitting or storing the MPEG-2 video bit stream and the MPEG-2 audio bit stream encoded by the MPEG-2 encoder.

The MPEG-2 system uses the packet multiplexing scheme used in time division multiplexing. At this time, each of the video and audio bit streams is divided into bit streams of an appropriate length called a packetized elementary stream (PES) packet.

PES packets have an upper limit of up to 64 kb for a variety of applications, and each packet can have either a fixed length or a variable length. Each PES data is multiplexed into one bit string to generate a TS.

TS packet has a relatively short fixed length of 188 bytes in consideration of connectivity with ATM (Asynchronous Transfer Mode).

The header of the TS packet of the MPEG-2 system will now be described with reference to FIG. 3.

As shown in FIG. 3, there is a 2-bit space for the scrambling control value in the MPEG-2 TS packet header.

Therefore, in the present invention, this space is used to indicate whether or not to encrypt. That is, if the scrambling control bit value is "11", the corresponding MPEG-2 TS packet has an encrypted payload.

4 is a detailed block diagram of an embodiment of the apparatus for generating protected video of FIG. 1 according to the present invention.

As shown in FIG. 4, the apparatus 10 for generating a protected video confirms whether the TS packet payload of the original video stream includes a video sequence header, a frame header, and an audio frame header, and determines a position to encrypt according to an encryption option. The TS packet analyzer 11 for searching and the payload of the MPEG-2 TS packet are encrypted, and the value of the scrambling control bit of the MPEG-2 TS packet is set to 'with encrypted payload (“11”). MPEG-2 TS payload encryption unit 12 for setting and a protected video generation unit 13 for generating a protected MPEG-2 TS video file using encrypted MPEG-2 TS packets.

The TS packet analysis unit 11 reads the MPEG-2 TS packet from the MPEG-2 TS file stored in the original video storage 41 and checks whether there is a video sequence header, a frame header, and an audio frame header at the payload of the TS packet. do. If the payload of the TS packet includes video and audio headers, this packet is not encrypted. In general, the streaming server performs a separate task by using the video sequence header, frame header, and audio frame header information of the streaming file to provide fast forward and rewind functions. If the entire payload of the TS packet is encrypted, since the header information required by the streaming server is encrypted, the encrypted file may not work properly on the streaming server. Therefore, in order to exclude such header information during encryption, it is necessary to check whether there is header information in the payload of the TS packet. If only the video I-frame encryption option is selected, the encryption option checks whether the video frame header is an I-frame, and detects TS packets corresponding to the I-frame. In addition, it is checked whether the packet is to be skipped without encryption according to the value of the TS packet skip count.

The MPEG-2 TS payload encryption unit 12 encrypts the payload of the corresponding MPEG-2 TS packet according to the encryption size in the TS packet of the encryption option, and sets the scrambling control bit in the MPEG-2 TS packet header unit to "11". do.

At this time, the encryption key information and the encryption option information used during encryption in the MPEG-2 TS payload encryption unit 12 are transmitted to the license server 20.

The protected video generation unit 13 generates a protected MEPG-2 TS file using the MPEG-2 TS packet processed by the MPEG-2 TS payload encryption unit 12. At this time, the protected MPEG-2 TS file generated by the protected video generating unit 13 is stored in the protected video storage 42 and is serviced through the streaming server 40.

5 is a flowchart illustrating a method of generating a protected video according to an embodiment of the present invention, which illustrates a process of generating a protected MPEG-2 TS video file from an original MPEG-2 video file.

In order to generate a protected video file, an original MPEG-2 TS video file to be protected is first selected (501).

Thereafter, when a video file is selected (501), an option to use when encrypting is input (502). Table 1 below shows the values of selectable encryption options.

Next, one MPEG-2 TS packet is read and analyzed from the selected file (503). That is, the TS packet analysis unit 11 reads the MPEG-2 TS packet from the MPEG-2 TS file stored in the original video storage 41 and checks whether there is a video sequence header, a frame header, and an audio frame header at the payload of the TS packet. Check it. If the payload of the TS packet includes video and audio headers, this packet is not encrypted. If only the video I-frame encryption option is selected, the encryption option checks whether the video frame header is an I-frame, and detects TS packets corresponding to the I-frame. In addition, it is checked whether the packet is to be skipped without encryption according to the value of the TS packet skip count.

The MPEG-2 TS payload encryption unit 12 encrypts the payload of the corresponding MPEG-2 TS packet according to the encryption size in the TS packet of the encryption option, and sets the scrambling control bit of the MPEG-2 TS packet header to "11". Set it. That is, the MPEG-2 TS payload is encrypted according to the set encryption option and the analysis result of the MPEG-2 TS packet (504).

Thereafter, a protected file is generated using the processed MPEG-2 TS packet (505). That is, the protected video generation unit 14 generates a protected MEPG-2 TS file using the MPEG-2 TS packet processed by the MPEG-2 TS payload encryption unit 12.

After the operation is completed, the information generated in the encryption process is transmitted to the license server 20 (506). Subsequently, when the license server 20 receives a license issuance request from the user, the license server 20 issues a license to the protected video player 50.

FIG. 6 is a detailed flowchart illustrating the MPEG-2 TS payload encryption process of FIG. 5 according to the present invention. In the MPEG-2 TS payload encryption unit 12 when the I-frame encryption option is set, FIG. MPEG-2 TS payload encryption process. That is, FIG. 6 corresponds to a case where only I-frames of a video stream are encrypted.

First, the TS packet analyzer 11 reads an MPEG-2 TS packet from an MPEG-2 TS file stored in the original video storage 41, and checks whether there is a video sequence header, a frame header, and an audio frame header at the payload of the TS packet. Check (601).

Thereafter, two bit values indicating the frame type are examined in the video frame header to check whether the frame is an I-frame, and then a TS packet corresponding to the I-frame is extracted (602).

Next, if the payload of the TS packet includes video and audio headers (603), this packet is not encrypted.

On the other hand, if the payload of the TS packet does not include the video and audio header (603), TS packets corresponding to the I-frame is encrypted (604, 605). That is, the payload of the MPEG-2 TS packet is encrypted according to the encryption size in the TS packet of the encryption option, and the scrambling control bit in the MPEG-2 TS packet header part is set to "11". In other words, the MPEG-2 TS payload is encrypted according to the set encryption option and the analysis result of the MPEG-2 TS packet.

7 is a structure diagram of a protected MPEG-2 TS packet according to the present invention.

As shown in FIG. 7, the scrambling control bit value of the encrypted MPEG-2 TS packet has a value of "11", and the scrambling control bit value of an unencrypted MPEG-2 TS packet has a value of "11". Do not.

8 is a detailed block diagram of an embodiment of the protection video playback device of FIG. 2 according to the present invention.

As shown in FIG. 8, the protection video reproducing apparatus 50 includes a streaming data receiving unit 51 that receives an MPEG-2 TS packet transmitted from the streaming server 40, and a decoding associated with the license storage 81. A decoding unit 52 for reading the information and decoding the payload of the MPEG-2 TS packet received from the streaming data receiving unit 51, and a reproducing unit for decoding the decoded MPE-2 TS packet and playing the video on the screen. Includes (53).

The streaming data receiver 51 receives the MPEG-2 TS packet transmitted from the streaming server 40 and transmits the received data to the decoder 52.

The decryption unit 52 reads the decryption related information from the license storage 81 and decrypts the streaming data received from the streaming data receiving unit 51. At this time, the decoded data is passed to the reproduction unit 53, and the reproduction unit 53 decodes the data to reproduce the video on the screen.

9 is a flowchart illustrating a method of playing a protected video according to an embodiment of the present invention, which illustrates a process of playing a protected MPEG-2 TS video file at a user side.

In the license storage 81 of the user side PC, the decryption related information is extracted from the license and stored.

When the VOD request is made, the protected video player 50 obtains decryption related information from the license storage 81 (901).

Thereafter, when the protected video playback device 50 requests the streaming server 40 to start streaming (902), the streaming server 40 reads data from the requested video and stores the MPEG-2 TS packet in the protected video playback device 50 ), And the protected video reproducing apparatus 50 receives this data via the network (903).

Next, the protection video reproducing apparatus 50 extracts a scrambling control bit value from the received MPEG-2 TS packet (904).

Subsequently, the scrambling control bit value is checked (905), and if the scrambling control bit value is "11" (906), since it is an encrypted MPEG-2 TS packet, the payload is decrypted using the decryption information of the license (907). Then, the processed MPEG-2 TS packet is transmitted to the decoder (908) to perform decoding.

On the other hand, if the scrambling control bit value is not "11" (906), it does not go through the decoding process (907). That is, the processed MPEG-2 TS packet is transmitted to the decoder (908) to perform decoding.

Thereafter, the decoded data is reproduced as a picture and a sound (909).

The above processes 903 to 909 are repeated until the reproduction of the moving image is completed (910), from the reception of the MPEG-2 TS packet to the reproduction of the moving image.

As described above, the method of the present invention may be implemented as a program and stored in a recording medium (CD-ROM, RAM, ROM, floppy disk, hard disk, magneto-optical disk, etc.) in a computer-readable form. Since this process can be easily implemented by those skilled in the art will not be described in more detail.

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.

 In the present invention as described above, in an environment in which a video of an MPEG-2 TS format is serviced on demand, the streaming server does not change information and encrypts and protects only the paid load of the MPEG-2 TS packet, There is an effect that can prevent illegal use and distribution of content through illegal storage of video.

In particular, the present invention does not target the entire MPEG-2 TS packet, and by selectively encrypting the MPEG-2 TS packet, the time required for decryption can be reduced, thereby improving the streaming service performance. There is.

In addition, the present invention can protect the video file while maintaining the existing streaming service environment as it is, there is an effect that can protect the copyright at a low cost.

Claims (14)

In the protection system of streaming video files, Protected video generating means for generating a protected video TS packet by encrypting a payload of an original video transport stream (TS) packet; A license server for storing and managing encryption information of the media data transferred from the protected video generating means, and issuing a license to a corresponding user when a license issuing request from a legitimate user; An Internet server which shows content information to a user and requests the license server to issue a license for the video content requested by the user; A streaming server for transmitting the protected video TS packet generated by the protected video generating means through streaming; And Protected video reproducing means for reproducing the decoded video TS packet by decoding the payload of the protected video TS packet transmitted from the streaming server by using the decrypted information of the issued license. Video file protection system that includes. The method of claim 1, The process of encrypting the payload of the video TS packet, A video file protection system characterized by indicating whether or not to encrypt in a 2-bit space for the scrambling control value of the MPEG-2 TS packet header. The method of claim 1, The license is It is a document in XML (eXtensible Markup Language) format that contains information necessary for the user to play the protected video. It contains the decryption key and encryption option necessary to decrypt the protected video. Video file protection system characterized in that the digital signature using the issuer's certificate is added. The method according to any one of claims 1 to 3, The protected video generating means, A TS packet analyzer for checking whether an original video transport stream (MPEG-2 TS) packet payload includes a video sequence header, a frame header, and an audio frame header, and finding a location to encrypt according to an encryption option; MPEG-2 TS payload encryption unit for encrypting the payload of an MPEG-2 TS packet and setting the value of the scrambling control bit of the MPEG-2 TS packet to "having an encrypted payload (" 11 ")" ; And Protected video generating unit for generating a protected MPEG-2 TS video file using the encrypted MPEG-2 TS packet Video file protection system that includes. The method of claim 4, wherein The protected video playback means, Streaming data receiving unit for receiving the MPEG-2 TS packet transmitted from the streaming server; A decoding unit for reading the decoding related information stored in the license storage and decoding the payload of the MPEG-2 TS packet received from the streaming data receiving unit; And A playback unit for decoding the decoded MPE-2 TS packet to play a video on the screen Video file protection system that includes. In the device for generating a video file of the streaming service, TS packet analyzing means for confirming whether a video sequence header, a frame header, an audio frame header are included in an original video transport stream (MPEG-2 TS) packet payload, and finding a position to encrypt according to an encryption option; Pre-encrypt the payload of the MPEG-2 TS packet according to the size of the target to be encrypted in the TS packet of the encryption option, and the scrambling control bit of the MPEG-2 TS packet. Is set to 'with encrypted payload ("11"), and then the video transmission stream transferring the encryption key information and the encryption option information used for the encryption to the license server for use in the decryption process. Payload encryption means; And Protected video generating means for generating a protected video transport stream (MPEG-2 TS) file using the encrypted video transport stream (MPEG-2 TS) packet Device for generating a protected video comprising a. The method of claim 6, The process of encrypting the payload of the MPEG-2 TS packet in the video transmission stream (MPEG-2 TS) payload encryption means, The apparatus for generating a protected video, characterized by indicating whether or not to encrypt in a 2-bit space for the scrambling control value of the MPEG-2 TS packet header. delete An apparatus for reproducing a protected video transport stream (MPEG-2 TS) packet generated by the protected video generating device of claim 6 or 7, Streaming data receiving means for receiving a video transport stream (MPEG-2 TS) packet transmitted from a streaming server; Decoding means for reading the decoding related information stored in the license storage and decoding the payload of the video transmission stream (MPEG-2 TS) packet received from the streaming data receiving means; And Playback means for decoding the decoded video transport stream (MPE-2 TS) packet to play a video on a screen; The license is It is a document in XML (eXtensible Markup Language) format that contains information necessary for the user to play the protected video. It contains the decryption key and encryption option necessary to decrypt the protected video. An electronic signature using an issuer's certificate is added, and is protected from the streaming server and stored in the license storage. delete In the method of generating a video file that is streaming service, Selecting a video transmission stream (MPEG-2 TS) file and setting an encryption related option to encrypt the selected file; An analysis step of reading and analyzing one video transport stream (MPEG-2 TS) packet from the selected file; A packet encryption step of encrypting a payload of the selected video transport stream (MPEG-2 TS) packet according to the encryption size in the TS packet of the encryption option according to the set encryption option and the analysis result; Generating a protected video transport stream (MPEG-2 TS) file by combining the encrypted video transport stream (MPEG-2 TS) packets; And And transmitting the encryption information to the license server so that the encryption option information and the encryption key information used in the packet encryption step can be used in the decryption process. The method of claim 11, The analyzing step, Read the MPEG-2 TS packet from the MPEG-2 TS file stored in the original video storage and check whether the payload of the TS packet contains the video sequence header, frame header, and audio frame header. If is included, this packet is not encrypted. If only the Encrypt video I-frame option is selected among the encryption options, the video frame header is checked to see if it is an I-frame, and TS packets corresponding to the I-frame are detected. And determining whether a packet is to be skipped without encryption according to the value of the TS packet skip count. The method of claim 12, The packet encryption step, Reading an MPEG-2 TS packet from an MPEG-2 TS file stored in the original video storage to determine whether there is a video sequence header, a frame header, and an audio frame header at the payload of the TS packet; Extracting a TS packet corresponding to the I-frame after checking whether it is an I-frame by looking at two bit values indicating a frame type in the video frame header; And If the payload of the TS packet includes video and audio headers, the packet is not encrypted. If not, the TS packets corresponding to the I-frame are encrypted. How to create a protected video comprising a. A method for reproducing a protected video transport stream (MPEG-2 TS) packet generated by the method for generating a protected video according to any one of claims 11 to 13,  Receiving a license and extracting decryption information from the license; Requesting streaming to the streaming server; Receiving a video transport stream (MPEG-2 TS) packet from the streaming server; Extracting a scrambling control bit value from the received video transport stream (MPEG-2 TS) packet and examining the extracted scrambling control bit value; And If the scrambling control bit value is set to 'with encrypted payload (" 11 "), the decryption information, including decryption key and encryption option required to decrypt the protected video, is used. Decoding the payload of the transport stream (MPEG-2 TS) packet, and then decoding and playing the decoded video transport stream (MPEG-2 TS) packet Protected video playback method comprising a.

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