how can I find streamming video url which protected by anti-url detector?

[bshi02]

I have purchased some online lesson and it require to log in their site to listen these lesson and moreover,these lesson only last 6 month period. So I tried to capture them with softwares of recode or detect hidden url(Url Snooper,URL Sniffers,orbit downloader,BB flashback,Getflv and so on.) even I tried remote control software(teamviewer,logmein) but I failed to capture .As long as I listen to these lesson(open it with IE browser)It always shut suddenly down all of these capture software.and I got an black screen in teamviewer's Remote Control screen. It seems that there is anti-url/recode software detector.
Is there any ways to recode or find hidden streamming url?
I'm sorry for my weird English and Any reply would be appreciated.
Thanks in advance.