Eric
We are using the "Alive Media Player" module for playing streaming podcasts and videos. The files to be streamed will have to be uploaded separately (outside of DMX) to a folder available to the media player module. Then a reference can be created in DMX that links to the media player module with the correct mediaID in a query string.
Here is an example...scroll down to the podcast section and you can play one of the free podcasts without having to register.
http://www.camstar.com/ResourceLibrary.aspxEnforcing security is as Peter suggested an issue. DMX will enforce security on the links within DMX, but if someone knows (or can guess) the file ID to be streamed, then it will play if other security measures are not taken. Our content is not such that for us it's a problem, but I can imagine it would be a serious issue for other applications. For a more secure environment you could consider something like VideoGuard by
http://www.hoyasoft.com.