Thanks for posting about it, unfortunately there's nothing I can do about it as CamStudio was originally released under the GPL which allows him to do this.
Although, he needs to remember that under the GPL, the source for all publicly-released modifications have to be released - if he doesn't, well then he's technically a very naughty boy! :)
Thanks Nick. Although I understand the concepts of GPL, where, when, and how they are applied I don't exactly follow. I just wanted to point it out in case there was any funny business. =D