I watched the videos on Photobucket, and they're too small for me to be able to pull a plate number off of. I'd have the best luck with the last video, as there's a pretty clear shot of the front plate through most of it -- I just need more resolution to work with.
Also, even though the security camera software is proprietary, you may still be able to get at the video files themselves -- the software our security camera server at work runs ends up saving all of its files as regular Windows Media files; you just have to dig for them.