I. Application Scope of DRM
Digital Rights Management (DRM) is a flexible platform that can protect and securely transmit on-demand content and subscription content, to play a video on a computer, a portable device, or a device connected to an IP network. DRM supports some new end-customer-oriented applications and provides new distribution channels for content owners. The application scope is as follows:
1. Subscription end users can pay a certain renewal fee in the form of monthly subscription and course subscription, and then subscribe to the courses from various content service websites.
To their computers. For example, an end user can subscribe to and download corresponding courses and play any number of playback times.
Both have licenses, and these licenses have the start date and end date. When the subscription fee covers the end time or the number of playbacks reaches the specified number of times
The end user only needs to connect to the website of the content service provider and pay the renewal fee. The license is automatically refreshed. Otherwise, the license becomes invalid.
2. Preview and purchase content through DRM technology, the retail website can provide end customers with services to listen before purchasing video courses. For example
After registering with the service, you can download any course credits and play them once. When the end user tries to play the teaser for the second time
The website of China Education Shinkansen and learn how to buy this course. In such applications, content owners can promote courses on the Internet.
Promote the latest courses, at the same time, it can also reduce marketing costs, use registration information to expand the mail list effect.
3. provide different licenses for a video/audio course using DRM. The China Education Shinkansen allows end customers to select the required licenses when purchasing the content.
For example, if an end user pays a small fee, he can play a video/audio course within one month. If the end user pays more
You can play this video/audio course permanently and transmit it to a portable device. After the end user pays a higher fee, the DRM
The license server will issue them a license without a termination date, allowing users to play the file on a portable audio device.
2. Basic DRM Workflow
1. Packaging: the packaged multimedia file has been encrypted and locked with a key. This key is stored in an encrypted license and licensed
Certificates are issued separately. information such as URLs are appended to multimedia files, and users can obtain a playback license.
2. Distribution: You can place packaged files on a web site for download, a media server, a CD, or e-
Mailed allows end users to send protected digital media files to their friends.
3. Create an authentication server: the content provider selects an authentication center and stores specific rights and rules in the server of the authentication center.
Windows Media Rights Manager license services is implemented. The task of the authentication center is to authenticate the license application of end users. Number
Media files and licenses are stored and distributed separately, which makes the entire system easy to manage.
4. license acquisition: in order to play a packaged digital media file, the end user must first obtain a license to decrypt the package file.
Key. The process of obtaining a license when an end user tries to obtain protected content, obtain a distribution license, or play the file for the first time
Start automatically. Windows Media Rights manager sends a registration page to the end user to obtain certain information or required fees. However
Then return a license from the Certification Center.
5. Play a media file in order to play a digital media file, the end user needs a media player that supports Windows Media Rights Manager.
Then, the end user can play media files based on the rules and authorization contained in the license. The license can contain different authorizations, such as: Start
The playback date and time, duration, and number of playbacks. The default authorization permission allows end users to play digital media files on a specific computer.
And allows users to copy this file to a portable device. However, authorization is not allowed to be transferred.
The word media file is sent to a friend who needs his own playback license. Therefore, this solution ensures that only
Only computers with keys can play corresponding digital media files.
Iii. Media control function of DRM system
1. control whether a media file can be played and the number of playback times;
2. control whether media files can be copied and the number of copies allowed;
3. Can I convert a media file to an sdmi format (the playback format of the caster) and control the number of conversions? BR> 4. Whether the specified file can be transferred to the CD recorder;
5. strictly control the start time and end date of the user's media file playback, accurate to minutes;
6. Can the user back up and restore the license;
7. The license can be downloaded and updated at any time within the validity period of the subscription.
4. Specific DRM function modules
1. Media File Management Module 1> media file packaging 2> encrypted media file publishing 3> server Media File Management
2. License Management Module 1> Generate a license 2> Publish a license 3> Manage a license
3. download media file management 1> dynamic loading of media information on webpages 2> user download of media files 3> download data statistics
4. Online Payment Module 1> online payment 2> resource provider fee statistics (associated with media files and resource providers) 3> agent fee statistics (
4> system fee statistics and analysis 5> specific operation modes can be designed based on the actual situation
5. DRM advantages
1. When the downloaded media file is copied or transmitted to another computer, the media software does not have a license and cannot be played. When a media file is played,
The system will jump to the specified purchase license page. After purchasing a license, you can directly watch it, saving the user download process. Therefore, copy
The file not only does not affect copyright issues, but also plays a role in marketing and reduces server load.
2. Because media files are downloaded to the client for playing, the network bandwidth of the Media Server is reduced and the operation cost is reduced. Media files cannot be viewed on the client.
The buffer is too long.
3. The platform has extended the content playback function, allowing end users to transmit content obtained through the subscription service to portable devices, thus opening up a potential
Unlimited market.
4. It accelerates the process of obtaining or renewing licenses in large content libraries and improves user satisfaction with online services.
