JP2007088704A - Server buildup type streaming system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a server buildup type streaming system for realizing smooth streaming reproduction by means of contents captured by a terminal and effectively preventing damages caused by copying the contents. <P>SOLUTION: In the server buildup type streaming system wherein the terminal for reproducing contents and an authentication server for carrying out first authentication for use of the contents are connected by way of an electronic communication means, the terminal includes: a server buildup means; a first contents storage means for storing the contents; a primary decryption means for executing primary decryption; a reproduction viewing means for carrying out streaming reproduction of the contents; a secondary key generating means; a secondary encryption means for sequentially carrying out secondary encryption; and a secondary key insertion means. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a server construction type streaming system, and more particularly to a server construction type streaming system in which a streaming server is constructed in a terminal that performs content (video file) reproduction and the content is stream reproduced from the streaming server.

  Conventionally, two types of systems are well known for reproducing content via the Internet. That is, a system using streaming and a system using downloading of video files.

  In a system using streaming, which is one system, it is common to perform streaming download of content from a streaming server existing in a remote place. In addition, a set of contents is downloaded in advance from an http server or the like, or is loaded from an external storage medium such as a DVD-ROM, and the contents are transferred to a playback / viewing apparatus for playback.

  In the former system, the content body is not sent from the streaming server to the terminal all at once, but a part of the frames necessary for playback are sequentially sent out, and this part of the frame is stored in the cache memory in the terminal. Only temporarily saved. Such a reproduction method has an advantage that the content is not illegally copied.

  The latter system is a system that downloads the entire content from an http server or the like to a terminal in advance via the Internet or loads the entire content from an external storage medium such as a DVD-ROM. In this case, since the entire content is downloaded and stored in a memory or the like, the content may be copied and used illegally.

  Considering these two systems, the digital distribution management (DRM) functioning reliably is the system on the streaming distribution side.

  The basic principle of digital copyright is to use a protocol such as RTSP (Real Time Streaming Protocol) for streaming distribution in communication with a server so that a digital content file is not left in a form that can be copied to a receiving terminal. . Of course, when accessing the streaming server of the distribution source, user registration / user authentication is performed, and if necessary, the terminal (hardware) ID is also subject to authentication. Access may be denied if the IDs are different.

  In user authentication, user names, passwords, and e-mail addresses are mainly targeted. If these are registered in advance, they are collated. As part of user authentication, authentication such as a credit card for billing is often performed at the same time. Streaming delivery from the server is performed only for users and hardware that pass such user authentication.

Patent Document 1 provides a high-speed and secure encryption method for streaming media, and Patent Document 2 maintains the convenience of guiding users to a content viewing page like a membership service using streaming distribution. However, similar to DRM, a streaming content distribution system and method for preventing unauthorized use of content are provided.
JP 2002-111162 A JP 2004-320623 A

  In a system that performs streaming playback using a streaming server as described above, content is divided and transmitted each time, so that it is difficult to use in an environment where it is not possible to connect to a high-speed Internet. Also, with this system, it is necessary to be able to connect to the Internet at all times during the playback of content. However, as a major drawback, the use of services (access to the server) is likely to be concentrated during popular content and when there are many viewers Even with a large-capacity Internet line, streaming failures such as frame dropping and communication interruption due to an increase in server load and traffic often occur.

  On the other hand, when content is downloaded in batch and played back, the terminal downloads the content from the content server once, stores it in the terminal, and then passes it as a file to the playback / listening device, so it is stored in the content server. A copy of exactly the same content as the original content will remain in the terminal.

  Content that is digital content does not deteriorate after copying like analog format data, and is a copy that has the same quality as the original content but remains in the receiving terminal. For this reason, a file having the same quality as the original content can be created from the child copy or grandchild copy. In order to prevent this, the above-mentioned digital rights management (DRM) by streaming distribution is often used for distribution of digital contents. Even if the content is encrypted, it is necessary to download the content from an http server or the like, decrypt it, and deliver it to the playback / viewing apparatus.

  In Patent Document 1, the streaming file is successfully encrypted, but the above-described server load and frame dropping due to traffic increase are not considered. Similarly, in Patent Document 2, since the content server is arranged separately from the receiving terminal and performs streaming playback via the network, no consideration is given to frame dropping due to an increase in server load or traffic.

  In view of the above-described problems, an object of the present invention is to provide a server-built streaming system that realizes smooth streaming reproduction by taking content into the terminal storage and effectively prevents copy damage of the content. It is in.

  The present invention relates to a server construction type streaming system in which a streaming server is constructed in a terminal for reproducing content (video file), and the content is streamed from the streaming server. The object of the present invention is to reproduce the content owned by the user. And a server-constructed streaming system in which a terminal that performs the first authentication of content use when the content is captured in the terminal or after the content is captured is connected via an electronic communication unit. Includes a server construction means for constructing an in-terminal server in the terminal after taking in the content, a content upload gateway means for uploading the content to the in-terminal server, and a first storage for storing the uploaded content. One story Storage means, primary decryption means for performing primary decryption of the content by primary authentication to the authentication server, playback / viewing means for performing streaming playback of the content, and secondary encryption Secondary key creating means for creating a key; secondary encryption means for sequentially performing secondary encryption of frames of the content reproduced simultaneously with streaming reproduction of the content; and Secondary key insertion means for inserting into a part of the whole content encrypted secondarily, second content storage means for storing the whole content encrypted secondarily, and the content after the second time This is achieved by including secondary decryption means for decrypting the entire content using the secondary key inserted into the entire content during streaming playback. It is.

  Further, the object of the present invention is that the secondary key includes at least the user information or the terminal-specific character or numerical value included in the primary authentication, or the secondary key is This is achieved more effectively by including a usage period for the content.

  Furthermore, the above object of the present invention is to construct a server in which a terminal that reproduces content and an authentication server that authenticates the use of the content when or after the content is captured in the terminal are connected via electronic communication means. A server-building means for building an in-terminal server in the terminal when the terminal takes in or after taking in the content, and a content upload gateway for uploading the content to the in-terminal server Means, first content storage means for storing the uploaded content, and unique information adding means for adding the user information and / or the terminal-specific information included in the primary authentication to the content , By authenticating to the authentication server, Primary decoding means for performing primary decoding, playback viewing means for performing streaming playback of the content, and further, the user information and / or the terminal included in the primary authentication for subsequent playback This is achieved by including the unique information adding means for collating with the unique information of the terminal that reproduces the unique information.

  In addition, the object of the present invention is that the user information and / or the terminal-specific information included in the primary authentication includes an expiration date of the content, or the content imported into the terminal. Is achieved more effectively by including a server construction program for constructing an in-terminal server of the terminal.

  According to the server construction type streaming system of the present invention, a server is constructed in a terminal used by a user, and content can be stored and digitally managed there. Therefore, content can be stored in the terminal without considering traffic congestion and server load. Streaming playback can be performed. Since the replayed fragment file is secondarily encrypted each time, even if the content is stored in the terminal and the file is copied to another terminal, it cannot be decrypted with the secondary key. It is possible to realize both content protection from illegal copying and simple streaming playback.

  Further, by attaching a server construction program to the content included in the content server, it is possible to construct a streaming server in the terminal simply by downloading the content.

  Note that the second key can be created uniquely and easily by using the user information and / or the value unique to the terminal included in the primary authentication as the information that only the terminal has.

  In addition, the user information and / or terminal-specific value included in the primary authentication includes a valid period of content use, and thus it is possible to manage restrictions on the content use period. .

The present invention constructs a server for uploading content in a terminal used by a user, realizes stable streaming playback of content regardless of traffic congestion and content server load, and at the same time protects content digital copyright It is a system that made it possible. It should be noted that the provision of content to the terminal may be performed in a batch or may be divided and supplied in a streaming format. Hereinafter, description will be given with reference to the drawings.
FIG. 1 is an example of an overall configuration diagram of a server construction type streaming system according to the present invention.

A plurality of terminals 1 ₁ to 1 _n used by a user include an authentication server 2 that authenticates content usage via electronic communication means, a content server 3 that provides content to the terminals 1 ₁ to 1 _n , and a DRM It is connected to a DRM server 4 that performs authentication. Content brought to the terminal 1 ₁ to 1 _n may be stored in the content server 3 performs double protection of the DRM processing and primary encryption. The authentication server 2 performs authentication for the primary encryption, and the DRM server 4 performs DRM authentication. However, since DRM may not be included depending on the content, DRM authentication is ignored at that time. The content server 3 is given as a medium for providing content to the terminals 1 ₁ to 1 _n . However, external storage devices such as DVD-ROM and CD-ROM, and external connection between terminals using peer-to-peer. Etc. may be used as the providing medium. In this system, the content of the authentication server obtained at the time of the primary decryption is obtained in the secondary encryption in which the contents are taken into the terminals 1 ₁ to 1 _n and this is simultaneously performed with the primary decryption. By including it in the secondary key, the terminals 1 ₁ to 1 _n do not need to be connected to the electronic communication line at the next reproduction. This will be described later.

FIG. 2 is an internal configuration diagram of the terminals 1 ₁ to 1 _n .

The terminals 1 ₁ to 1 _n incorporate the content stored in the content server 3 or the content stored in an external storage device such as a DVD-ROM into the terminals 1 ₁ to 1 _n and perform server construction and reproduction. . In order to capture this content, the terminals 1 ₁ to 1 _n include terminal-side transmission / reception means 11 for transmitting / receiving data to / from the authentication server 2, content server 3, and DRM server 4, and content for capturing content from an external storage device. uploading and external content loading unit 12, an input unit 13 for various input is performed on the terminal ₁ 1 to 1 _n, a server constructing means 15 for server construction to the terminal ₁ within one to 1 _n, the content to the server And content upload gateway means 14 for doing so. As described above, the server construction program is attached to the content subjected to the primary encryption, and the server construction program is operated by taking the content into the terminals 1 ₁ to 1 _n . . It is also possible to perform server construction by the server construction means 15 by the server construction program in the terminals 1 ₁ to 1 _n in advance before taking in the contents.

The primary decryption of content is a defense means against theft by unauthorized users when it is taken into the terminals 1 ₁ to 1 _n from the content server 3 or an external storage device, and the content use to the authentication server 2 The primary decryption is performed using the primary key provided by the authentication.

In order to make the content uploaded to the server constructed in the terminals 1 ₁ to 1 _n usable and reproducible, the following configurations are included in the terminals 1 ₁ to 1 _n .

The terminals 1 ₁ to 1 _n further include first content storage means 16 for storing the uploaded content and user information included in the primary authentication and / or unique information of the terminals 1 ₁ to 1 _n. And a unique information adding means 17 for authenticating the unique information, a primary decrypting means 18 for performing the primary decryption of the content, and a secondary encryption for the primary decrypted content. Secondary key creating means 19 for creating a secondary key for performing, and secondary encryption means 20 for performing secondary encryption of the content decrypted using the secondary key. Secondary key insertion means 21 for inserting the secondary key into the second encrypted content, second content storage means 22 for storing the second encrypted content, Next encrypted content A secondary decryption unit 23 of the secondary decryption is configured and a content gateway unit 24 for delivering content to a playback device or the like.

Note that the first encrypted content is first decrypted in the first viewing after being uploaded by the content upload gateway unit 14 to the in-terminal server unit constructed by the server construction unit 15. The content is decrypted by the means 18 and is reproduced by the reproduction / viewing means 26 via the content gateway means 24. In the second viewing, the content decrypted at the first viewing is decrypted. Since the secondary encryption is performed with the secondary key at the same time as the encryption, the content is reproduced only by the secondary decryption at the server unit in the terminal without performing the primary decryption of the content via the electronic communication means. It is possible. For this reason, it is not necessary to connect the terminals 1 ₁ to 1 _n to the electronic communication means for the second and subsequent reproductions. The secondary key is information including user information included in the primary authentication and / or terminal-specific values of the terminals 1 ₁ to 1 _n , and a hash value or the like can be used as an example. . In addition, by including the authentication information (particularly the content usage period) for the authentication server 2 performed at the time of the primary decryption in the secondary key, the authentication to the authentication server 2 is omitted in the second and subsequent playbacks. Can be made.

Further, depending on the processing capability of the CPU (not shown) of the terminals 1 ₁ to 1 _n , the respective loads of secondary encryption performed simultaneously with the primary decryption and playback by the playback / viewing device 26 are excessive. In some cases, such a problem may occur such as dropping frames. Therefore, the unique information adding means 17 is separately provided in the in-terminal server, and the user information and / or hard disk ID included in the primary authentication and the content server for the uploaded primary encrypted content 3 is converted into a hash value or the like and inserted into the unique information of the terminals 1 ₁ to 1 _n such as the access date and time, the computer name, and the usage period. Thereby, the protection by the hash value is given to the content instead of performing the secondary encryption. Whether to perform secondary encryption or to add unique information is determined by the input means 13 by a selection input to an encryption selection means (not shown) in the in-terminal server unit. The unique information is authenticated by the unique information adding means 17.

  By the above-described secondary encryption or unique information addition, authentication information at the time of primary decryption is inserted into the content as a secondary key or unique information. This prevents unauthorized diffusion of content and eliminates the need to re-import content from electronic communication means or an external storage device.

The secondary decryption is preferably performed immediately before the content streaming reproduction in order to avoid the risk of illegal copying of the content. To include unique information of the user information and / or terminal 1 ₁ to 1 _n included in the primary authentication to the secondary key, the user information and / or terminal 1 ₁ to 1 included in the same primary authentication It is also determined whether or not the playback is within _n .

In order to reproduce the content included in the in-terminal server unit, the terminals 1 ₁ to 1 _n perform DRM authentication with respect to the DRM server 4 and perform DRM authentication decryption means 25 for decrypting the DRM cipher, And reproduction viewing means 26 for performing reproduction.

  DRM authentication is intended only for content to which DRM is attached, and it is not necessary to perform it for content to which DRM is not attached. Further, there may be a case where only DRM is attached and encryption is not performed. In that case, there is no need to perform decoding.

  The playback / viewing means 26 is not limited as long as it is a player capable of performing streaming playback by inserting a player for performing normal streaming playback.

FIG. 3 is a diagram showing changes caused by encryption and decryption of contents taken into the terminals 1 ₁ to 1 _n , and FIG. 4 is a diagram showing operations between the servers.

The content captured by the terminals 1 ₁ to 1 _n exists in a state where the primary encryption is performed on the DRM-encrypted content. The server construction program exists by being added to the content subjected to the primary encryption, and is executed by the server construction means 15 when it is taken into the terminals 1 ₁ to 1 _n . .

The content uploaded to the server unit in the terminal is subjected to primary authentication with respect to the authentication server 2 at the time of the first playback, and the content ID, user name, password, usage period, etc. pass the authentication to perform primary decryption. The primary key for is brought to the terminals 1 ₁ to 1 _n . With this primary key, the content is first decrypted, and after being decrypted by the DRM authentication decrypting means 25, the playback / viewing means 26 reproduces it.

When the secondary decryption is performed at the same time as the primary decryption of the content, the secondary encryption means 20 sequentially sends the secondary decryption content streaming data to the secondary key. Secondary encryption using. As described above, the secondary key is user information included in the primary authentication and / or unique information of the terminals 1 ₁ to 1 _n , and is converted into a hash value or the like and finally all the secondary ciphers. It is inserted inside the converted content. For the second and subsequent reproductions, the secondary decryption means 23 determines whether or not the reproduction is performed by a valid user or the same terminals 1 ₁ to 1 _n using the secondary key included in the content, If it is determined to be used, the streaming data is sequentially secondarily decoded and sent to the playback / viewing means 26. Also in this case, considering the third and subsequent reproductions, encryption by the secondary encryption means 20 is performed simultaneously with the secondary decryption.

FIG. 5 and FIG. 5 are flowcharts showing a flow from content acquisition to reproduction to the terminals 1 ₁ to 1 _n .

The content viewed by streaming is taken into the terminals 1 ₁ to 1 _n by the content server 3, an external storage device such as a DVD-ROM, or file sharing between terminals such as peer-to-peer (step S101). The fetched content includes a server construction program, and the server construction means 15 operates the server construction program to construct the in-terminal server unit in the terminals 1 ₁ to 1 _n (step S102). Note that this server construction may be performed in advance by fetching only the server construction program from the outside before fetching the content.

After the in-terminal server is constructed, the content captured in the terminals 1 ₁ to 1 _n is uploaded to the first content storage unit 16 of the in-terminal server unit by the content upload gateway unit 14 (step S103). Thus, the content is prepared in the in-terminal server unit. As described above, when there is a concern about insufficient processing capacity of the CPU (not shown), the user information included in the primary authentication and / or the unique information of the terminals 1 ₁ to 1 _n is added to the unique information. The means 17 creates (step S104), and the unique information is inserted into the content stored in the first content storage means 16 (step S105).

  In order to reproduce the content uploaded to the in-terminal server unit (step S106), it is necessary to perform use authentication (primary authentication) of the content and to decrypt the first encrypted content.

In the first decryption, the user name, password, etc. input from the input means 13 in the terminals 1 ₁ to 1 _n and the authentication server 2 perform primary authentication with respect to user names, passwords, etc. registered in advance. Thus, the primary decryption key is transmitted to the terminals 1 ₁ to 1 _n . Of course, the user name and password may be registered in the authentication server 2 on the spot. Further, authentication by the authentication server 2 may be performed before content acquisition. With this primary authentication, the user or terminals 1 ₁ to 1 _n that perform billing and the content that performs billing are specified in the authentication server 2 (step S107). If the primary authentication is not correct, authentication is performed again or the process is terminated.

In the terminals 1 ₁ to 1 _n that have received the primary key for performing the primary decryption, the primary decryption means 14 performs the primary decryption of the content by using the primary key. (Step S108). At the same time, instead of authentication with the authentication server 2, authentication of the user information input from the input means 13, that is, the unique information added to the content by the unique information adding means 17 for the user name, password, etc. Do. When the uploaded content is transferred to another terminal by copying or the like, the content reproduction is not performed because the specific information includes the user information and / or the information of the terminals 1 ₁ to 1 _n . The primary decoding is performed on the streaming data for streaming playback of the content, and is sequentially transmitted from the content gateway unit 24 to the playback / viewing unit 26 (step S109).

By the way, when DRM authentication is required for the content (step S110), it is necessary to perform DRM authentication for the DRM server 4. When the DRM is included in the content and the DRM authentication for the DRM server 4 is correct (step S111), the DRM applied to the content is performed (step S112). In the DRM process, when the DRM encryption is performed, the DRM key is decrypted by the terminals 1 ₁ to 1 _n when the DRM key is decrypted from the DRM server 4 and the DRM authentication decrypting means 25 decrypts the DRM key. If DRM encryption has not been performed, the DRM applied to the content is processed. Each frame subjected to the DRM process in this way is reproduced by the reproduction / viewing means 26 (step S113). As described above, the content captured in the terminals 1 ₁ to 1 _n is decrypted and reproduced.

  For the subsequent playback, the unique information including the information used for the primary authentication is added to the content, so that the primary authentication to the authentication server 2 is omitted, and the unique information is added by the unique information adding means 17. It can be played back only by authentication.

  FIG. 6 is a flowchart for performing secondary encryption.

For the contents taken in the terminals 1 ₁ to 1 _n , the first decrypted data is sent to the reproduction / viewing means 26 via the content gateway means 24 and is not encrypted. It will exist as raw data. For this reason, secondary encryption is performed on the reproduced part as needed along with the reproduction. For the second and subsequent reproductions, the secondary encryption is viewed by secondary decryption.

  Although there is a method of adding unique information as described above, secondary encryption is performed to ensure more copy protection (step S201).

In order to perform secondary encryption of content, it is first necessary to create a secondary key (step S202). The secondary key includes the user name and password, the computer name, the hard disk ID, the content ID, the access date / time of the content, and the usage period used by the secondary key creation means 19 in the primary authentication and primary decryption. It is desirable that the data used in the primary authentication using the above and the data for identifying the terminals 1 ₁ to 1 _n are merged. By performing this fusion, it is not necessary to perform further authentication to the authentication server 2 in the secondary decryption described later, and the secondary decryption is performed when copied illegally from the terminals 1 ₁ to 1 _n. It is possible to have a function to disable it. Of course, the secondary key does not include the information used for the primary authentication and the primary decryption, and the secondary key decryption means 23 can be designed to authenticate the authentication server 2 again. Is possible.

  After creating the secondary key, the secondary encryption means 20 applies the secondary key to the portion of the first decrypted data sent from the content gateway means 24 to the playback / viewing means 26. The secondary encryption is applied using (step S203). The secondary encrypted data is sequentially stored in the secondary content storage unit 22 (step S204). Further, the secondary key is finally inserted into a part of the content encrypted secondarily and stored together with the content. As a result, the secondary encryption of the content is started together with the start of the reproduction of the content, and the time that the content exists in the terminal server in the state of raw data is reduced as much as possible.

In the second and subsequent playback (step S205), the secondary decryption means 23 detects the secondary encrypted secondary key, and secondary decryption is performed (step S206). At this time, the secondary decryption means 24 confirms the primary authentication information included in the secondary key, the user information included in the primary authentication, and / or the information unique to the terminals 1 ₁ to 1 _n. As a result, it is simultaneously determined whether or not the terminals 1 ₁ to 1 _n have been subjected to the use authentication with respect to the authentication server 2 and the primary decryption. In particular, by including the usage period in the secondary key, it is possible to determine the usage period of the content at the time of the secondary key and secondary decryption.

  After the secondary decryption, the content portion is sent from the content gateway means 24 to the playback / viewing device 26 (step S207) and, if necessary, DRM authentication (steps S209 to 210) is performed. Then, content reproduction is performed by the reproduction / viewing device 26 (step S211). Also at this time, the secondary encryption is performed using the secondary key simultaneously with the start of reproduction, and the content is stored in the second content storage means 22. If there is a change in the usage period or the number of uses of the secondary key, the secondary key is recreated.

Incidentally, in the server terminal is not limited only if it is created within the terminal 1 ₁ to 1 _n, also the present invention an external server connected by the terminal 1 ₁ to 1 _n and the LAN or WAN or the like of the network I do not care.

It is an example of the whole block diagram of the server construction type streaming system concerning the present invention. It is an example of the internal structure figure of the terminal based on this invention. It is an example of the change figure from the taking-in of content to reproduction | regeneration based on this invention. It is an example of the simplified diagram showing operation | movement of each server until content reproduction based on this invention. It is an example of the flowchart which shows the flow from content download to reproduction | regeneration based on this invention. It is an example of the flowchart at the time of performing secondary encryption to the content based on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Terminal 2 Authentication server 3 Content server 4 DRM server 11 Terminal side transmission / reception means 12 External content loading means 13 Input means 14 Content upload / gateway means 15 Server construction means 16 First content storage means 17 Unique information addition means 18 Primary Decryption means 19 Secondary key creation means 20 Secondary encryption means 21 Secondary key insertion means 22 Second content storage means 23 Secondary decryption means 24 Content gateway means 25 DRM authentication decryption means 26 Playback Viewing means

Claims (6)

A server-constructed streaming in which a user-owned terminal that reproduces content and an authentication server that performs primary authentication of content use when the content is captured into the terminal or after the content is captured are connected via electronic communication means A system,
The terminal is
Server construction means for constructing an in-terminal server in the terminal after capturing the content;
Content upload gateway means for uploading the content to the in-terminal server;
First content storage means for storing the uploaded content;
Primary decryption means for performing primary decryption of the content by primary authentication to the authentication server;
Playback viewing means for streaming playback of the content;
A secondary key creating means for creating a secondary encryption key;
Secondary encryption means for sequentially performing secondary encryption of the frames of the content reproduced simultaneously with streaming reproduction of the content;
A secondary key insertion means for inserting the secondary key into a part of the entire content encrypted by the secondary encryption;
Second content storage means for storing the entire content that has been secondarily encrypted;
Server-structured streaming characterized by comprising secondary decoding means for decoding the entire content using the secondary key inserted into the entire content during the second and subsequent streaming playback of the content system. 2. The server-constructed streaming system according to claim 1, wherein the secondary key includes at least the user information included in the primary authentication or the character or numerical value unique to the terminal. The server-constructed streaming system according to claim 1, wherein the secondary key includes a usage period of the content. A server-constructed streaming system in which a terminal that reproduces content and an authentication server that authenticates use of the content when or after capturing the content in the terminal are connected via electronic communication means,
The terminal is
Server construction means for constructing an in-terminal server in the terminal at the time of capturing the content or after capturing;
Content upload gateway means for uploading the content to the in-terminal server;
First content storage means for storing the uploaded content;
Unique information adding means for adding the user information and / or the terminal-specific information included in the primary authentication to the content;
Primary decryption means for performing primary decryption of the content by authentication to the authentication server;
Playback viewing means for streaming playback of the content;
Further, for the second and subsequent playbacks, the user information and / or the unique information adding means for collating with the unique information of the terminal that reproduces the terminal-specific information included in the primary authentication. A server-built streaming system that features 5. The server-constructed streaming system according to claim 4, wherein the user information and / or the terminal-specific information included in the primary authentication includes a usage period of the content. The server construction type streaming system according to any one of claims 1 to 5, wherein the content taken into the terminal includes a server construction program for constructing an in-terminal server of the terminal.

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