asp CAPTCHA(completely automated public Turing test to tell computers and humans apart) duraboys 2010. 3. 3. 10:06 http://www.tipstricks.org/aspsig/examplev3.asp http://www.motobit.com/util/captcha/ http://sourceforge.net/projects/asp-captcha 아랜 상용 http://www.lanapsoft.com/products.html 저작자표시 (새창열림)