WM Recorder in the Real Time recording mode (ADA or PRO) captures network packet while your Windows Media Player or Real Player plays a video/audio stream, so content providers can't discover you recording streaming video.

That is one of the reasons why WM Recorder is very unique!!!

In the URL mode (that is similar to the way the majority of other stream recorders work), there is a possibility that you can be discovered, however it is very very low.