Fraps application is shareware, by default, but you can download a trial version from the official website. Indeed, after it's installed, the software is limited and provides only basic functions. Besides that, it doesn't allow full time recording, and embeds watermark on your images or videos.
If you buy the software, these limitations will be removed, therefore you will have the possibility of using it as you please.
Buy page: http://www.fraps.com/buy.php