Music is “streamed” from the device over the USB connection to the DMR where it is decrypted and playedĮxpanding the Ecosystem Portable Media Device (PMD) PC Copy Content WMDRM-PD over USB WMDRM-ND over HTTP Stream Content WMDRM-ND over MTP/ USB or HTTP WM DRM for Network Devices.The DMR enumerates all available content on the portable device.A user wishes to play music from his portable device on aDigital Music Receiver (DMR) at a friend’s house.The content is copied to a portable device that supportsWM DRM PD 10.Users download purchase or subscription DRM content.Portable devices do not interoperate with network devices.Policy prohibits content from being copied from a device.Sharing music on portable devices is difficult.Disconnecting from PC stops all playback, flushes buffers.May not persist content for later playback.May use storage to extend network buffer during streaming and playback.Storage must be provided for the Digital Media Receiver (DMR) and any CA certificates in the chain.
Unique serial number required (to prevent device cloning).Local storage required for content and DRM Data Stores.Hashed Message Authentication Code (HMAC) is FIPS 198.Hashing algorithm is Secure Hashing Algorithm 1 (SHA-1).This is the private key and the Portable Device must store it securely.Public Key Infrastructure (PKI) is ECC with 160/80-bit PrivKey/PubKey.Rivest Cipher 4 (RC4) with 64-bit keys with Byte Streams.Data Encryption Standard (DES) with 56-bit keys in 8 byte blocks.Block Cipher – WMDRM Algorithm which includes.WM DRM for Portable Devices Requirements Compromised or non-compliant devices can be revoked.Keys individualized per OEM, per device.Supports many of the new WM DRM PC features.Access content using licenses with state (Expiration, Play Count).No change to content encryption format: existing contentjust works.Device Examples: Portable Media Device, Cell Phone,STB, PDA, etc.Acquire and store licenses/content, access offline.Portable version of Windows Media DRMfor devices.
Multiple portable and network devices are available on the market today.
For a fee, access a movie on a PC or device for a limited timeĪdoption of WM DRM on Devices is Growing!.For a monthly fee, unlimited music downloads and transfer.Purchase a track or entire album for a fixed fee.Used by media players that support WM DRM content.Allows content owners to specify Rights (usage rules).Designed for any home network device intended to extend playback of audio/video content from a PC.For devices that are designed to store and play back audio/video content.Windows Media DRM Device Ecosystem WM DRM for PortableDevices WM Rights Manager Format SDK Authorization Protected Content WM DRM for Network Devices Distribution Content Server Windows Media DRM 10 for Network Devices.Windows Media DRM 10 for Portable Devices.Windows Media DRM Device Porting Kits Today.Windows Media DRM Device Porting Kit Review Scott Plette Program ManagerMedia Technology Group splette Microsoft Corporation