There is a shitty thing called 'RA security layer' that encrypt/decrypt audio stream in some way. The only purpose of this is not to let you save RA stream into file (I hate that wise guys at RealNetwork!).
Once upon a time a company called Streambox (www.streambox.com) f#$%ed up that security layer (their prog was called Streambox Ferret, how my memory serves me). But now it's unavailiable for download on their site because of lawsuits with RealNetworks.
If anyone have or can find this or similar prog please let me know (tanner@au.ru).