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Windows Media Mobile Technology
Music Downloads and SubscriptionsYou can build a mobile media solution using Windows Media mobile technology that enables your subscribers to purchase and download music, and to obtain music subscriptions. Subscribers can search for music and view music news and background information. For music downloads, subscribers can purchase and download music tracks or albums to their handsets, and then play the music. For music subscriptions, subscribers can download and rent a set of music files for a time period after paying a periodic fee.
Alternatively, subscribers can download the music to their personal computers and then synchronize the tracks to their handsets. You can implement either or both of these methods for this mobile media scenario.
How It WorksContent providers encode the music tracks to Windows Media Audio files by using Windows Media Encoder 9 Series. The files are encrypted using Windows Media Digital Rights Management (DRM) 10. Subscribers can download the files directly to their handsets from a Web server or synchronize the content from their personal computers using Media Transport Protocol (MTP).
Handsets contain Windows Media DRM 10 for Portable Devices and either the Windows Media Audio 10 Professional or the Windows Media Audio 9 codec. These Windows Media components enable the handsets to obtain DRM licenses, decrypt content, and then decode and play music. Licensing is managed by a server running Microsoft Windows Server 2003 with Windows Media Rights Manager 10.
The following tables describe the service and mobile device components you'll need to create a music download or subscription service.
Service Components| Component | Description |
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Windows Media Services 9 Series (a service of the Windows Server 2003 operating systems)
| Streams live or on-demand audio and video content over a public or private IP-based network, such as the Internet or an intranet. You can configure and manage one or more streaming media servers that deliver your content to fixed and mobile devices.
For more information, see Windows Media Services 9 Series.
| Windows Media Rights Manager 10
| Protects and securely delivers audio and video content for playback on a computer, portable device, or network device.
For more information, see the Windows Media Rights Manager 10 SDK documentation.
| Windows Media Encoder 9 Series
| Compresses and encodes audio and video content to a Windows Media file or live stream.
For more information, see Windows Media Encoder 9 Series.
| Windows Media Encoder 9 Series SDK
| Enables you to automate the encoding process for custom applications and solutions, and to perform remote encoding.
For more information, see the Windows Media Encoder 9 Series SDK documentation.
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Mobile Device Components| Component | Description |
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Windows Media Audio 10 Professional codec
| Offers the widest range of capabilities of any Windows Media audio codec. It can be used for mobile scenarios at bit rates below 128 kilobits per second (Kbps) all the way up to multi-channel playback at 768 kbps. Now one codec can deliver profiles that offer both better-than-CD resolutions and high-efficiency encoding to optimize for wireless delivery and playback.
| Windows Media Audio 9 codec
| Decodes the Windows Media-based content on the mobile device in a highly compressed yet high-quality format, and provides other functionality used by the device for playing the content. This codec is optimized to deliver high-fidelity audio in all situations, from low-bit-rate and low-bandwidth scenarios to broadcast speeds.
For more information, see Windows Media Audio Codecs.
| Windows Media DRM 10 for Portable Devices
| Obtains and stores the DRM license, and then decrypts the content. Windows Media DRM 10 has the flexibility to create a model that works for you. This can include purchase, rental, or subscription models delivered either directly to the handset over the air, or indirectly via a personal computer connection over USB.
To download white papers about Windows Media DRM 10 device technologies, see A General Overview of Windows Media DRM 10 Device Technologies and A Technical Overview of Windows Media DRM 10 for Devices.
| Media Transfer Protocol (MTP)
(if PC connectivity desired)
| The Media Transfer Protocol (MTP) makes it easy for an operator or handset vendor to exchange information with a personal computer running Windows Vista or Windows XP without having to write custom drivers for the handsets. Implementing MTP on a mobile device allows for driverless connectivity and synchronization support via Windows Media Player 11 or Windows Media Player 10. Combined with Windows Media DRM 10 for Portable Devices, the world of online music and video stores is open to your device, adding value to your offering.
For more information about MTP, see the Media Transfer Protocol Specification.
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