To play a protected ASF file, a consumer must obtain a separate license containing the key. Each license also contains rights, determined by the content owner or license issuer, which specify how the consumer can use the file. Using DRM technology, content owners can deliver songs, videos, and other digital media files over the Internet in a protected file format and control the use of their digital content.
Enabling DRM Support. Skip to main content. This browser is no longer supported. Download Microsoft Edge More info. Contents Exit focus mode. Please rate your experience Yes No. Any additional feedback? E-commerce and content identification information are received by the license provider. Content information comes from the Web page through which the end user ordered the movie. E-commerce information is sent by the e-commerce provider. Typically, the only e-commerce information needed by a license provider is whether license issuance has been approved.
Content information is used to locate the DRM profile record in the license provider database. The content information on the Web page could be a simple ID number, which is used by the database engine to locate corresponding information that should not be exposed to the public, such as the license key seed. Rights associated with the content are also retrieved from a database. Rights determine how the content can be used. For example, you can set the number of plays for a file or stream and an expiration date.
Content information, the key used to protect the content, and rights are used to generate a unique license, which is then issued to the client. Windows Media Player searches the computer for a valid license. If the license exists, the movie plays.
This method for obtaining a license is called silent predelivery. With this method, the end user may not even be aware a license process is occurring. With predelivery, a license is generated before an end user begins playing encrypted content. After receiving the go-ahead from the e-commerce service, the download or streaming process begins. During the first few moments of the process, the license is generated and installed on the client without any need for further intervention by the end user.
Predelivery can be made moments before streaming begins or at any other time prior to playing the content. You could create a subscription service by predelivering a license that covers a number of files or streams.
An end user could then purchase a license that covers content that will be delivered over several months or a year, for example.
An end user can also obtain a license through the standard delivery method, which involves the use of the license acquisition URL that was added to the content header when the stream was encoded. This is the method shown in figure With standard delivery, the license acquisition process begins after an end user attempts to play encrypted content.
Whenever an end user starts to play an encrypted file or stream, Windows Media Player checks the computer for a valid license. The page used by the Contoso Movies Online site will guide the end user through the process of paying for a movie rental, and then issue a license.
It does not matter where the file comes from because the only way to play the file is by obtaining a license from the Web page identified in the license acquisition URL. Previous page. Table of content. Next page. The following process describes the content creation part of the Windows Media Rights Manager scenario in the diagram: The content creator opens Windows Media Encoder and sends a request for a DRM profile to the license provider.
Information used to create the DRM profile is also saved in a license provider database. The end user can then download or begin streaming the movie. What is Lean Six Sigma. Streaming Media Bible. Beginning Cryptography with Java. Certified Ethical Hacker Exam Prep.
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