Can You Tube and BBC Iplayer videos be played on Blender's Sequence Editor?

I am aware that VSE can play .mp4 and .wmv video formats?

Can You Tube and IPLayer videos be somehow converted and played on VSE?

Download youtube videos and add then into the sequencer. Generally the hd version will be mp4. Converting this to an image sequence before loading into the sequencer may give much better performance. Please note the license given to the video by the orginator http://www.youtube.com/t/creative_commons

Iplayer downloaded videos have drm so cannot be played outside the BBC iplayer. The forum rules do not allow discussion of how to remove this drm so please do not ask the question !

Thanks, Richard. Very useful information.
I won’t even ask what drm stands for.
You have been helpful on a number of occasions