Technologies behind Networked Audio

There are several technologies/standards that are needed to realize the next big thing - the networked audio. In a series of posts I'd be giving an overview of some of the following:

• Networking (Ethernet, WiFi, TCP/IP, UDP stacks)
• Streaming Protocols (WMS/MMS, Radea, Shoutcast etc.,)
• Audio decoders (MP3, WMA, FLAC, OCG, AAC etc.,)
• DRM (Cardea, Janus etc.,)
• Music Services (vTuner, Rhapsody, Napster, Sirius)
• UPnP/DLNA
• Win7/WLK

First we would be looking into UPnP/DLNA.