> There was some products like 'Streambox VCR!' to do this 
job
> (download .rm files from a rtsp server), but they
> disappeared due to IP issues. Of course, they are sued by
> RealMedia.

Hahaha! And now real media is wondering why their products 
are not used anymore by anyone. Proprietary, lack of 
documentation and support, and IP issues.
Burn to hell, real media ..