Please note that you can choose between Flash, Quick Time and Windows Media on Lynda.com. Just go to the Player Prefs in the right bottom corner and change the settings.

I've tried to record Windows Media stream in the ADA mode, and didn't have any problem with it. If you want to stay undetected, you may record Windows Media streams in the PRO mode. Note that the latter mode requires records in real time, and you need to play your streams up to the end.

If you want to stay undetected when recording flash streams, try to use the Loopback Recorder that comes with WM Recorder 14.8.

And you can also copy HTTP video streams from the cache of your web-browser.

As for DVD, what kind of format do you need? Do you want to create a DVD-Video disc? Or do you want to burn a DVD with AVI, FLV, MP4, MOV,... video files?