Cisdem Video Converter
I'll get straight to the point. The only reason I use Cisdem Video Converter is to download videos from the Internet for one client of mine. (The videos are of herself.)
This is the only program I know that can successfully download video when the MP4 source file is encrypted like from Brightcove and Akamai HD. On Brightcove and other secure video sites, the files are streamed in pieces as .ts files from a .m3u8 playlist source. Cisdem Video Converter seems to be able to make these one single MP4 file. Essentially, this program can download video from Brightcove.
This program has other featues as well such as coverting video files from DVD and ISO sources.