You can only split clips in Windows Movie Maker. Any other type of editing, such as lighting, contrast, size, etc., has to be done externally before importing it into the program.
You download the clips from the internet to your machine (computer). Then you import the media into WMM (windows movie maker).
Video formats WMM uses include:
.asf, .avi, dvr-ms, .m1v, .mp2,...
You can't edit songs in Windows Movie Maker. Any audio editing has to be done on an external audio editing program prior to importation. The most you can do with the audio/song is reduce the volume,...
The only editing you can do to videos on Windows Movie Maker is restricted to cutting/splitting, volume level adjustments and some minor visual manipulations such as increasing/decreasing...
Splitting clips in Windows Movie Maker is easy. Visit the URL I've posted below for step-by-step instructions on How to Split Clips/Video in Windows Movie...
You probably can do that but you would have to add something to the clip so it is not copyrighted. I once did that with a clip I got by email and I just added a few captions. Remember, put the users...