from the media, the licensing terms can be
from the media, the licensing terms can be changed without the need to encrypt the media file again and then redistribute to the client. Windows Media Rights Manager supports rental or subscription business models. Limited play previews allow the potential purchasers to look before they buy. Windows Media Rights Manager can predeliver licenses. This helps to remove the consumers resistance to the acquisition and playing of secure media files. One feature is silent licensing, which means that a content provider may silently deliver the license to the consumer, without the need for the consumer to intervene. Secure Audio Path One area where content can be stolen is within the user s PC. If the clear audio data passing between the DRM client and the sound card driver is intercepted, then the content easily can be diverted and saved to the disk. To prevent this, Windows Media has a feature called the Secure Audio Path (supported by Windows ME and XP). The DRM is embedded in the OS kernel. Before decryption, the DRM kernel component verifies that the path to the sound card driver is valid and authenticated. If any unauthorized plug-ins exist, then the decryption is barred. This prevents plug-ins on the sound card from copying the audio data. Microsoft certifies valid drivers for security. Controlled Transfer to SDMI Portable Devices Windows Media Device Manager permits the secure transfer of protected media files to Secure Digital Music Initiative (SDMI) portable devices or the removable media for those devices. SyncCast One of Microsoft s partners is SyncCast. They have a suite of products that allow Windows Media content to be distributed as streams or on CD/DVDROMs over intranets or the Internet. To sell content, SyncCast partnered with iBill, a supplier of turnkey e-commerce solutions. Their SyncPack DRM packager is a client application that permits content creators, authors, and distributors to encrypt Windows Media files. SyncCast has adopted the .NET infrastructure to allow the remote administration of content licenses. The digital rights are managed from the Web browser-based DRM Dashboard. From this the administrator can view usage reports, change business rules, add new products, and control users. The business rules and licenses are stored on SyncCast s centralized DRM servers. 284 The Technology of Video and Audio Streaming
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