JP3650045B2 - DRM distribution system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention belongs to the technical field of distribution systems.
[0002]
[Prior art]
In recent years, various technologies related to DRM (Digital Rights Management) have been developed. As an example of realizing DRM in a business model for distributing music / video streaming data over the Internet, a system is known in which a homepage is a membership system, ID and password authentication is performed, and the number of downloads of paid content is recorded and charged. .
[0003]
[Problems to be solved by the invention]
Streaming data for parallel processing of reception and playback does not remain as a file on the user's magnetic disk, so this is an advantageous data format from the viewpoint of DRM, but the user's access environment is a 64k digital line, cable TV. There are situations where it is difficult to determine the band to be encoded due to the fact that there are various lines such as a line, an ADSL line, and an FTTH line. If streaming data is distributed in the low-quality band according to the slowest line, the playback screen will be as small as a business card, so it will not sell even if it is charged. Moreover, enormous expenses are required to construct a large-scale system that requires member management as in the prior art. An object of the present invention is to construct a simple system that can distribute streaming data at a low cost.
[0004]
[Means for Solving the Problems]
According to the present invention, the above-mentioned problems are achieved by the means described in the claims.
In a DRM distribution system used for DRM , a first invention is a distributed streaming server that distributes encrypted streaming data to a user computer, and a key that can decrypt the streaming data distributed from the streaming server. A centrally managed accounting server for distribution to the user computer, wherein the user computer receives streaming data from the streaming server, and decodes the streaming data received by the streaming data receiving unit. An access means for checking whether or not the user computer possesses a key that can be used, and if the user computer does not possess the key, the access means for accessing the accounting server; And a key receiving means for receiving the key from the accounting server accessed in this way, and an embedding means for incorporating the key received by the key receiving means into the user computer. a plurality of streaming data comprising encoded separately, home to those encrypted with one key, delivering streaming data in a band the user computer desires, D distribution RM characterized in that System.
The second invention, the release key is a 1 DRM for distribution system according to the invention you characterized in that it has a time attribute defining the expiration date.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows an example of a home page that distributes streaming data. When a user who wants to view digital content opens the URL of the home page, a screen as shown in FIG. 1 is displayed. The illustrated screen includes six titles, each of which has a jacket photo 10 on the left, an artist name and album title 11, an explanation column 12, and a download button 13 on the right. The download button 13 has three buttons 14 to 16 of High, Mid, and Low. A user with a wide band gives High quality, a user with a medium band gives Mid quality, a user with a narrow band gives Low quality, Each can be freely selected.
[0006]
First, when a user clicks on one of the title areas, it is checked whether or not the user has a release key for decrypting the streaming data. If not, the user's browser screen is charged. Move to server. Here, when the user designates the purchase of the key of the title, a predetermined program operates, and a time attribute is given to the copy of the key, and it is incorporated into the user computer.
[0007]
A user who has purchased a key of a title can view all the bands in the title, that is, any of the three streaming data of High, Mid, and Low. If the mid button 15 is pressed by the user, distribution of medium quality streaming data is started. In the user computer, the encryption of the streaming data received by the receiver is released by the key incorporated in the user computer. Meanwhile, the player software plays the streaming data on the middle screen. Here, in the case where a frequent dropout occurs due to congestion of the line at night, the selection of the Mid quality is stopped, the switching to the selection of the Low button 16 is performed, and the reproduction is performed on a small screen, thereby stably. You can watch it. In addition, when a new communication service contract is concluded at a later date and the access line is switched to a high-speed line, the title can be viewed on the large screen with the previously purchased key by selecting the High button 14.
[0008]
The key purchased by the user expires in a predetermined period, for example, 7 days. When the expiration date expires, the home page in FIG. 1 moves the user who wants to view the streaming data to the accounting server again in order to confirm whether or not to continue using the key. When the user designates continuous use, a predetermined program operates to update the time attribute of the key.
[0009]
FIG. 2 is a conceptual explanatory diagram of the system configuration. In FIG. 2, a centrally managed billing server 20, distributed streaming servers 21 and 22, and a large number of users 23 to 25 are connected via the Internet 26. The number of streaming servers 21 and 22 may be one, but the model according to the present invention can be easily distributed. The accounting server 20 is preferably centrally managed as one, and takes relatively high security measures.
[0010]
FIG. 3 is an explanatory diagram of encoding. In FIG. 3, the three types of video content produced by the creator are compressed by changing the image quality in three different bands. The low compression process 34 compresses the original video content 30 into high-quality streaming data 31 of 1 Mbyte, and the medium compression process 35 compresses the original video content 30 into medium-quality streaming data 32 of 500 kbytes. The high compression process 36 compresses the original video content 30 into low quality streaming data 33 of 256 kbytes. As illustrated, nine pieces of streaming data are generated from three types of video content.
[0011]
FIG. 4 is an explanatory diagram of key generation and encryption. A packager responsible for sales / distribution of copyrighted works generates one type of key pair for one type of video content, and encrypts a plurality of pieces of streaming data having different qualities with one encryption key. The encrypted individual streaming data can be decrypted by the other decryption key. In FIG. 4, since there are three types of video content, the key generation process 40 generates three types of key pairs, and the encryption process 41 uses the encryption key in the generated key pair for each video content. Encrypts three pieces of streaming data of different quality.
[0012]
FIG. 5 shows a conceptual diagram of the package supply method. The publisher packages and supplies three pieces of streaming data 50 of High 51, Mid 52, and Low 53, which are encrypted with an encryption key, and a release key 54 for releasing the encryption. In FIG. 5, packages of three titles are created from three types of video content.
[0013]
FIG. 6 is an explanatory diagram of uploading. The publisher can immediately start the streaming data distribution service by uploading the three-title package created as described above to the servers 60-62. In the example of FIG. 6, the encrypted streaming data 63 to 65 are placed in the distributed streaming servers 60 and 61, and the release keys 66 to 68 are placed in the predetermined billing server 62. Then, on the home page, the encrypted streaming data 63 to 65 corresponding to various titles and the release keys 66 to 68 are linked.
[0014]
If the encrypted streaming data is written on a recording medium such as a CD-R, and the recording medium is mounted on a user computer, the server function can be realized by a recording medium such as a CD-R. At this time, the encrypted streaming data is distributed locally in the user computer.
[0015]
【The invention's effect】
As described above, according to the present invention, content encoding can be performed for each band, so that it is possible to cope with a variety of user access environments. In addition, since the streaming data can be encrypted, DRM can be realized in the form of package supply. Furthermore, since a plurality of pieces of streaming data having different qualities can be encrypted with the same key, the load required for managing contents and keys that can reach tens of thousands, hundreds of thousands, or even enormous numbers can be reduced.
[Brief description of the drawings]
FIG. 1 is a diagram showing an example of a homepage. FIG. 2 is a conceptual diagram of a system configuration. FIG. 3 is a diagram of encoding. FIG. 4 is a diagram of key generation and encryption. [Figure 6] Explanatory drawing of uploading [Explanation of symbols]
10 Jacket Photo 11 Artist Name and Album Title 12 Description Column 13-16 Button 20, 62 Billing Server 21, 22, 60, 61 Streaming Server 23-25 User 26 Internet 30 Original Video Content 31-33 Streaming Data 34-36 Compression Process 40 Key generation process 41 Encryption process 50, 63 to 65 Streaming data of different quality and encrypted 51 to 53 Encrypted streaming data 54, 66 to 68 Release key

Claims (2)

In the DRM distribution system used for DRM,
A distributed streaming server for delivering encrypted streaming data to user computers;
A centrally managed accounting server that distributes a key capable of decrypting streaming data distributed from the streaming server to the user computers;
With
The user computer is
Streaming data receiving means for receiving streaming data from the streaming server;
An access means for checking whether or not the user computer possesses a key capable of decrypting the streaming data received by the streaming data receiving means, and in the case where the user computer does not possess the access means for accessing the accounting server;
Key receiving means for receiving the key from the accounting server accessed by the access means;
Built-in means for incorporating the key received by the key receiving means into the user computer;
Comprising
The streaming server,
A plurality of streaming data obtained by encoding one content for each band, which is encrypted with one key, and distributes streaming data of a desired band by the user computer ;
D RM for delivery system that features a call. The release key, DRM for distribution system according to 請 Motomeko 1 characterized in that it has a time attribute defining the expiration date.

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