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DRM Protection and Content License Distribution

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[The feature associated with this page, Windows Media Format 11 SDK, is a legacy feature. It has been superseded by Source Reader and Sink Writer. Source Reader and Sink Writer have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use Source Reader and Sink Writer instead of Windows Media Format 11 SDK, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]

On the creation side, digital rights management technology involves two main processes: (1) protecting the content and (2) providing licenses for the content. Protecting a file basically involves encrypting the content, and including a URL in the file header that specifies where a license for the content may be obtained. If you want to protect files with and then distribute the files to other computers or devices, you can use either the Windows Media Format SDK or the Windows Media Rights Manager SDK to protect the file. For live-DRM scenarios, you must use the Windows Media Format SDK to protect the content as it is being encoded.

To create and issue licenses for protected content, you can create your own custom solution using the objects of the Windows Media Rights Manager SDK, or you can use a service run by a third party.

Whichever method you use, the protected files that you create will contain, in the DRM header object, a URL that tells client applications where to obtain a license for the content.

Note

The Windows Media Format SDK does not provide support for creating or issuing licenses.

 

On the playback side, a DRM-enabled application must be able to obtain licenses for protected content, to decrypt that content using the key contained in the license, and to enforce the license restrictions, such as the number of times a file may be played, or whether the file can be copied to another device. The Windows Media Format SDK provides all the support required to create a fully enabled DRM playback application.

Note

DRM is not supported by the x64-based version of this SDK.

 

Digital Rights Management Features

Enabling DRM Support